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2016-04-27 2016-04-27 0000036405 index:S000002846Member index:AdmiralSharesForParticipantsMember index:C000105304Member 2016-04-27 2016-04-27 0000036405 index:S000002846Member index:AdmiralSharesForParticipantsMember index:MsciUsSmallCapGrowthIndexMember 2016-04-27 2016-04-27 0000036405 index:S000002846Member index:AdmiralSharesForParticipantsMember index:SplicedSmallCapGrowthIndexMember 2016-04-27 2016-04-27 0000036405 index:S000002846Member index:AdmiralSharesForParticipantsMember index:CrspUsSmallCapGrowthIndexMember 2016-04-27 2016-04-27 pure iso4217:USD 2016-04-27 485BPOS 2015-12-31 VANGUARD INDEX FUNDS 0000036405 false 2016-04-27 2016-04-27 0 0 0 0 0 0 0 0 <!-- DOCTITLE -->Vanguard Extended Market Index Fund<!-- /DOCTITLE --> <!-- $$/page= --> Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0019 0.0008 0 0 0.0003 0.0001 0.0022 0.0009 Examples The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 23 9 71 29 124 51 280 115 23 9 71 29 124 51 280 115 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. 0.06 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard & Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Extended Market Index Fund Investor Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 21.69% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.60% (quarter ended December 31, 2008). 0.1427 0.0433 -0.3873 0.3743 0.2737 -0.0373 0.1831 0.3819 0.0742 -0.0339 highest return 2009-06-30 0.2169 lowest return 2008-12-31 -0.266 20 20 Average Annual Total Returns for Periods Ended December 31, 2015 -0.0339 -0.0373 -0.0176 -0.0327 -0.0335 -0.0342 0.1031 0.0999 0.0813 0.1046 0.1037 0.1024 0.0764 0.0736 0.0615 0.078 0.0768 0.079 Vanguard Mid-Cap Growth Index Fund Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization growth stocks. Fees and Expenses Vanguard Mid-Cap Index Fund The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Shareholder Fees<br><br> (Fees paid directly from your investment) <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000016 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000017 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000014 column period compact * ~</div> 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000013 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000012 column period compact * ~</div> 0 0 0 0 Vanguard Mid-Cap Value Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization value stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Shareholder Fees<br /><br />(Fees paid directly from your investment) 0 0 20 20 Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br /><br />(Expenses that you pay each year as a percentage of the value of your investment) 0 0 0 0 0 0 0 0 20 20 0 0 0 0 0 0 0 0 20 20 Vanguard Mid-Cap Growth Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization growth stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Vanguard Extended Market Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. 0.0016 0 0.0004 0.002 Shareholder Fees</br></br>(Fees paid directly from your investment) Vanguard Total Stock Market Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. Fees and Expenses Fund Summary 0.0016 0.0006 The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Investment Objective 0 0 The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0.0004 0.0002 The following table describes the fees and expenses you may pay if you buy and hold Institutional Select Shares of the Fund. 0.002 0.0008 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Select Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&amp;P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&amp;P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Principal Risks Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br/><br/>&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br/><br/>&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br/><br/>&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br/><br/>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 20 Annual Total Returns 64 113 The following bar chart and table are intended to help you understand the risks of investing in the Fund. Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Extended Market Index Fund. (Institutional Shares are offered through a separate prospectus.) Performance of the Fund&#8217;s Institutional Select Shares would be substantially similar to that of the Institutional Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. The bar chart shows how the performance of the Fund&#8217;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8217;s target index and a comparative index, which have investment characteristics similar to those of the Fund. The Spliced Dow Jones U.S. Completion Total Stock Market Index reflects performance of the Dow Jones Wilshire 4500 Index through June 30, 2008, and the Dow Jones U.S. Completion Total Stock Market Index thereafter. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 255 Examples Annual Total Returns &#8212; Vanguard Extended Market Index Fund Institutional Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 21.78% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.55% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0 20 64 113 0 255 0 0.0016 0.0006 Portfolio Turnover The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0 0 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. 0.0004 0.0002 Portfolio Turnover Principal Investment Strategies 0.002 0.0008 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Growth Index, a broadly diversified index of growth stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. Principal Risks 0 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization growth stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 0.0002 0.0002 0.0017 0.0007 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks Annual Total Returns An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br/><br/>&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br/><br/>&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br/><br/>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 0 Annual Total Returns &#8212; Vanguard Mid-Cap Growth Index Fund Investor Shares Annual Total Returns 0.0003 0.0001 Annual Fund Operating Expenses<br><br>(Expenses that you pay each year as a percentage of the value of your investment) 0.002 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.0008 During the periods shown in the bar chart, the highest return for a calendar quarter was 17.99% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;27.33% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Examples The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.0113 -0.0006 -0.0093 -0.0093 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 20% of the average value of its portfolio. Examples The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.2 During the periods shown in the bar chart, the highest return for a calendar quarter was 16.95% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.73% (quarter ended December 31, 2008). 2 Examples Vanguard Mid-Cap Index Fund 0.105 0.1202 0.1069 6 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.08 0.0887 0.0818 Average Annual Total Returns for Periods Ended December 31, 2015 -0.0324 -0.0362 -0.0165 -0.0335 -0.0342 0.1048 0.1011 0.0827 0.1037 0.1024 Investment Objective 0.0783 0.075 0.063 0.0768 0.079 The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks. Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund Investor Shares The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Fees and Expenses Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares or Institutional Plus Shares of the Fund. vanguard.com/performance 800-662-7447 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 20 8 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 20 8 64 26 113 45 255 103 0 0 64 26 113 45 255 103 0 0 0 0 0 0 20 8 0 0 0 0 64 26 113 45 255 103 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0 0 0.173 -0.4707 0.4254 0.2893 20 8 -0.0384 0.0006 0.0004 0.1581 64 26 20 8 0.3202 113 45 0.1335 64 26 -0.0113 113 45 255 103 0 0 2006-08-24 2006-08-24 2006-08-24 2006-08-24 0 0 0.0001 0.0001 255 103 0.0007 0.0005 20 20 Examples Portfolio Turnover The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares or Institutional Plus Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. Portfolio Turnover Principal Investment Strategies The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 15% of the average value of its portfolio. 20 8 Principal Investment Strategies 64 26 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified index of stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Growth Index, a broadly diversified index of growth stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 45 113 Principal Risks 255 103 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Value Index, a broadly diversified index of value stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Portfolio Turnover Annual Total Returns &#8212; Vanguard Mid-Cap Index Fund Institutional Shares Principal Risks The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 15% of the average value of its portfolio. During the periods shown in the bar chart, the highest return for a calendar quarter was 21.64% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.62% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization growth stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns 0.0013 0.0004 0.15 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Principal Investment Strategies Annual Total Returns &#8212; Vanguard Mid-Cap Value Index Fund Investor Shares 0 0 0.0003 0.0001 During the periods shown in the bar chart, the highest return for a calendar quarter was 24.96% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;24.14% (quarter ended December 31, 2008). 0.0016 0.0005 Average Annual Total Returns for Periods Ended December 31, 2015 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified index of stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The expense information shown in the table reflects estimated amounts for the current fiscal year. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. An investment in the Fund could lose money over short or even long periods. 16 5 52 16 An investment in the Fund could lose money over short or even long periods. 28 90 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 205 64 The bar chart shows how the performance of the Fund&#8217;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8217;s target index and a comparative index, which have investment characteristics similar to those of the Fund. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.0029 -0.0015 0.0053 0.0039 0.0057 0.004 0.004 Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Extended Market Index Fund. 0.1203 0.1161 0.096 0.1216 0.1225 0.1218 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 Annual Total Returns &#8212; Vanguard Mid-Cap Index Fund Investor Shares 0.0739 0.0704 0.0599 0.0751 0.0755 0.0751 0.23 0 800-662-7447 An investment in the Fund could lose money over short or even long periods. vanguard.com/performance During the periods shown in the bar chart, the highest return for a calendar quarter was 21.53% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.63% (quarter ended December 31, 2008). An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.136 0.0602 -0.4182 0.4022 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.2546 -0.0211 0.158 -0.0437 0.35 0.136 -0.3664 800-662-7447 0.3761 -0.0146 0 0.2163 -0.0044 vanguard.com/performance 0.1591 0.3742 0.1384 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. -0.0191 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. highest return 0 Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Extended Market Index Fund. (Institutional Shares are offered through a separate prospectus.) Performance of the Fund&#8217;s Institutional Select Shares would be substantially similar to that of the Institutional Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. 2009-09-30 0.2153 lowest return 2008-12-31 -0.2563 Average Annual Total Returns for Periods Ended December 31, 2015 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. -0.0179 -0.006 -0.0146 -0.0134 -0.0055 -0.0128 -0.0128 0.1137 0.1108 0.0904 0.1152 0.1184 0.1158 Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 0.0019 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0 0.0003 0.0022 0.0776 0.075 0.0628 0.079 0.0807 0.0794 Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Annual Total Returns &#8212; Vanguard Mid-Cap Growth Index Fund Investor Shares The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. highest return 800-662-7447 lowest return vanguard.com/performance 0.2178 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 2009-06-30 -0.2655 2008-12-31 23 71 124 280 0.1551 0.0549 -0.3704 0.287 0.1709 0.0096 0.1625 During the periods shown in the bar chart, the highest return for a calendar quarter was 17.99% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;27.33% (quarter ended December 31, 2008). 0.3335 0.1243 0.0029 -0.0133 -0.0171 -0.0051 -0.0055 -0.0128 -0.0128 0.1153 0.112 0.0918 0.1184 0.1158 Average Annual Total Returns for Periods Ended December 31, 2015 0.0793 0.0763 0.0642 0.0807 0.0794 -0.013 -0.0055 -0.0128 -0.0128 0.1156 0.1184 0.1158 0.1193 0.1221 0.1195 0.173 -0.4707 0.4254 0.2893 -0.0384 0.1581 0.3202 0.1335 -0.0113 highest return 2009-06-30 0.1695 lowest return 2008-12-31 -0.2273 23 71 124 280 highest return 2009-09-30 0.2496 lowest return 2008-12-31 -0.2414 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. Principal Investment Strategies 0.03 The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&amp;P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&amp;P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 Annual Total Returns 2010-12-15 2010-12-15 2010-12-15 2010-12-15 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. vanguard.com/performance Vanguard Total Stock Market Index Fund Vanguard Large-Cap Index Fund Vanguard Value Index Fund Investment Objective Investment Objective Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization value stocks. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Fees and Expenses Fees and Expenses Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Shareholder Fees<br /><br />(Fees paid directly from your investment) Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Shareholder Fees<br /><br />(Fees paid directly from your investment) Shareholder Fees<br /><br />(Fees paid directly from your investment) Annual Total Returns &#8212; Vanguard Extended Market Index Fund Investor Shares 0.1378 0.0622 -0.4176 0.4051 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 0.2567 0 -0.0196 0.1601 0 After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 0 0.3517 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Vanguard Mid-Cap Value Index Fund Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. 0.1378 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. -0.0133 Investment Objective 0 Vanguard Mid-Cap Growth Index Fund 0 The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization value stocks. Average Annual Total Returns for Periods Ended December 31, 2015 Investment Objective After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Fees and Expenses The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization growth stocks. 0 The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Fees and Expenses 0 Shareholder Fees<br/><br/>(Fees paid directly from your investment) The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. 0 0 0 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Annual Fund Operating Expenses<br /><br />(Expenses that you pay each year as a percentage of the value of your investment) Example Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.0339 -0.0335 -0.0342 Portfolio Turnover Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 20% of the average value of its portfolio. 0.1031 0.1037 0.1024 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. Annual Fund Operating Expenses<br /><br />(Expenses that you pay each year as a percentage of the value of your investment) Principal Investment Strategies Principal Investment Strategies Annual Fund Operating Expenses<br /><br />(Expenses that you pay each year as a percentage of the value of your investment) 0.0764 0.0768 0.079 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Value Index, a broadly diversified index of value stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Growth Index, a broadly diversified index of growth stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization growth stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. highest return 0.0004 2009-09-30 0.0006 0.2164 Annual Total Returns Annual Total Returns lowest return 0.0007 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2008-12-31 Annual Total Returns &#8212; Vanguard Mid-Cap Growth Index Fund Admiral Shares 0 -0.2562 Annual Total Returns &#8212; Vanguard Mid-Cap Value Index Fund Admiral Shares 0 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.68% (quarter ended March 31, 2012), and the lowest return for a quarter was &#8211;8.23% (quarter ended September 30, 2015). 0.0001 During the periods shown in the bar chart, the highest return for a calendar quarter was 14.34% (quarter ended March 31, 2013), and the lowest return for a quarter was &#8211;6.74% (quarter ended September 30, 2015). Average Annual Total Returns for Periods Ended December 31, 2015 0.0002 Average Annual Total Returns for Periods Ended December 31, 2015 0.0001 0.0005 0.0008 0.0008 0 0 0 0 0 0 0 0 Example Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Example Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.0006 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.0006 0 5 0 8 0.0002 0.0002 8 0.0008 16 0.0008 highest return 26 2009-09-30 After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 26 0.1799 28 lowest return 45 2008-12-31 45 -0.2733 64 8 103 8 26 103 26 45 45 103 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 103 Portfolio Turnover Portfolio Turnover Vanguard Large-Cap Index Fund Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. -0.0191 -0.0238 -0.0075 -0.0109 -0.0175 -0.0175 -0.018 -0.0109 -0.0175 -0.0175 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 4% of the average value of its portfolio. -0.0098 -0.0006 -0.0093 -0.0093 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 8% of the average value of its portfolio. 0.1702 0.1626 0.171 Principal Investment Strategies Vanguard Value Index Fund 0.1442 0.1607 0.1446 Vanguard Growth Index Fund 0.1211 0.1169 0.0964 0.1164 0.1233 Investment Objective 0.078 0.0739 0.0625 0.0764 0.0799 Investment Objective Vanguard Large-Cap Index Fund Principal Investment Strategies Vanguard Value Index Fund Vanguard Growth Index Fund Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Vanguard Total Stock Market Index Fund 0.15 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Index, a broadly diversified index of large U.S. companies representing approximately the top 85% of the U.S. market capitalization. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Investment Objective The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Value Index, a broadly diversified index predominantly made up of value stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Investment Objective Investment Objective Principal Risks An investment in the Fund could lose money over short or even long periods. Investment Objective Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. Principal Risks An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization value stocks. Principal Risks The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization growth stocks. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fees and Expenses An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization value stocks will trail returns from the overall stock market. Large-cap value stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fees and Expenses Fees and Expenses The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization value stocks. Fees and Expenses The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization growth stocks. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Annual Total Returns The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. Annual Total Returns Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund Admiral Shares 2006-08-24 2006-08-24 2006-08-24 2006-08-24 2006-08-24 2006-08-24 800-662-7447 During the periods shown in the bar chart, the highest return for a calendar quarter was 16.92% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.72% (quarter ended December 31, 2008). Annual Total Returns &#8212; Vanguard Large-Cap Index Fund Admiral Shares Annual Total Returns &#8212; Vanguard Value Index Fund Admiral Shares vanguard.com/performance During the periods shown in the bar chart, the highest return for a calendar quarter was 16.05% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.13% (quarter ended December 31, 2008). 0 0 During the periods shown in the bar chart, the highest return for a calendar quarter was 17.42% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;20.42% (quarter ended December 31, 2008). 0 0 Average Annual Total Returns for Periods Ended December 31, 2015 0 0 0 Average Annual Total Returns for Periods Ended December 31, 2015 0 0 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0 0 0.0039 0 0 0 0 0 Average Annual Total Returns for Periods Ended December 31, 2015 0 0 -0.0086 0 0 0 0.1216 0.0107 0 0 0 0 0.117 0 0 0 0.0751 20 20 0.1238 20 20 0.0646 20 20 Fees and Expenses 0.0747 Fees and Expenses Fees and Expenses When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 7 5 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 23 16 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 40 28 90 64 Vanguard Large-Cap Index Fund 0 0 0 0 0 0 0.1427 0.0433 -0.3873 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000082 column period compact * ~</div> 0.3743 0.0017 0.0006 0 0.2737 0.0019 0.0007 -0.0373 0 0.002 0.0007 0.1831 8 0 0.0013 0.3819 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000083 column period compact * ~</div> 8 26 0 0 26 0.0742 0 0 45 45 -0.0339 0 0 0 0 0 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000084 column period compact * ~</div> 103 0.0003 0.0002 0.0003 0.0001 0.0002 0.0001 0.0003 -0.0098 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000086 column period compact * ~</div> 0.002 0.0008 -0.018 0.1348 0.1398 0.3222 0.0022 0.0008 0.3766 0.0022 0.0008 0.1596 0.1602 0.0016 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000087 column period compact * ~</div> highest return highest return highest return lowest return lowest return lowest return 2009-06-30 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 2009-06-30 2009-09-30 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 2008-12-31 2008-12-31 Examples Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Examples 2008-12-31 0.1692 Examples 0.1605 0.1742 Example The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.2272 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.2213 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.2042 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000022 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000023 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000024 column period compact * ~</div> 2011-09-27 2011-09-27 2011-09-27 2011-09-27 2011-09-27 2011-09-27 2011-09-27 2011-09-27 highest return 2009-06-30 Vanguard Growth Index Fund 0.2169 lowest return Investment Objective 2008-12-31 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000026 column period compact * ~</div> -0.266 The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization growth stocks. Fees and Expenses 20 8 23 8 23 8 The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. 16 64 26 71 26 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000027 column period compact * ~</div> 71 26 52 113 45 124 45 124 45 90 255 103 280 103 280 103 205 20 8 23 8 800-662-7447 23 8 16 800-662-7447 64 26 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 800-662-7447 71 26 vanguard.com/performance vanguard.com/performance 71 26 vanguard.com/performance 52 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 113 45 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 124 45 124 45 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 90 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 255 103 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 280 103 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 280 103 205 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 9% of the average value of its portfolio. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 0.09 Portfolio Turnover vanguard.com/performance Portfolio Turnover 800-662-7447 Portfolio Turnover Portfolio Turnover Vanguard Mid-Cap Value Index Fund Example An investment in the Fund could lose money over short or even long periods. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. Vanguard Mid-Cap Index Fund Investment Objective The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 9% of the average value of its portfolio. An investment in the Fund could lose money over short or even long periods. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 8% of the average value of its portfolio. Investment Objective An investment in the Fund could lose money over short or even long periods. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 4% of the average value of its portfolio. The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization value stocks. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fees and Expenses 0.03 Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. 0.09 The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. 0.08 0.04 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Growth Index, a broadly diversified index predominantly made up of growth stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.03 Principal Risks Principal Investment Strategies An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization growth stocks will trail returns from the overall stock market. Large-cap growth stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Investment Strategies 0 Principal Investment Strategies 0.08 Principal Investment Strategies 0 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Index, a broadly diversified index of large U.S. companies representing approximately the top 85% of the U.S. market capitalization. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.04 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Value Index, a broadly diversified index predominantly made up of value stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Growth Index, a broadly diversified index predominantly made up of growth stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Investment Objective Principal Risks Principal Risks Principal Risks Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization value stocks will trail returns from the overall stock market. Large-cap value stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization growth stocks will trail returns from the overall stock market. Large-cap growth stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fees and Expenses 0 0 0 The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund. 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0016 0.0017 0 0 During the periods shown in the bar chart, the highest return for a calendar quarter was 21.69% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.60% (quarter ended December 31, 2008). 0.0003 0.0004 0.002 Shareholder Fees</br></br>(Fees paid directly from your investment) 0.002 Example Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: An investment in the Fund could lose money over short or even long periods. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.2 20 An investment in the Fund could lose money over short or even long periods. 20 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 64 64 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 113 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 113 255 vanguard.com/performance An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 255 800-662-7447 highest return 2013-03-31 Annual Total Returns 0.1434 20 lowest return 64 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2015-09-30 113 Annual Total Returns -0.0674 255 Annual Total Returns Annual Total Returns Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Large-Cap Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Value Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Growth Index Fund Investor Shares 20 64 Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund Investor Shares 113 255 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.97% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.11% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 17.38% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;20.44% (quarter ended December 31, 2008). 800-662-7447 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.59% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;23.88% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 16.95% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.73% (quarter ended December 31, 2008). vanguard.com/performance Portfolio Turnover Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 15% of the average value of its portfolio. Average Annual Total Returns for Periods Ended December 31, 2015 Vanguard Value Index Fund The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 20% of the average value of its portfolio. Average Annual Total Returns for Periods Ended December 31, 2015 0.15 Average Annual Total Returns for Periods Ended December 31, 2015 0.2 Average Annual Total Returns for Periods Ended December 31, 2015 Principal Investment Strategies Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Principal Investment Strategies Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified index of stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Value Index, a broadly diversified index of value stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Principal Risks Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance: <br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector. <br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. <br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions. <br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Investment Objective Annual Total Returns &#8212; Vanguard Growth Index Fund Admiral Shares An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization value stocks. Annual Total Returns Fees and Expenses The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund. 0.0029 0.0057 0.004 0.004 0.0017 Annual Total Returns &#8212; Vanguard Mid-Cap Index Fund Investor Shares Shareholder Fees<br/ ><br/ >(Fees paid directly from your investment) 0.0019 0.0317 0.0288 0.0202 0.033 0.0338 0.0423 0.0338 0.002 0 -0.0103 -0.0161 -0.0012 -0.0086 -0.0181 -0.0086 -0.0086 0 Annual Total Returns &#8212; Vanguard Mid-Cap Value Index Fund Investor Shares 0.0093 0.005 0.0089 0.0107 0.0122 0.0111 0.0111 0.1203 0.1225 0.1218 0.1296 0.1269 0.1038 0.1312 0.1378 0.1321 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. 0.1154 0.11 0.092 0.117 0.1119 0.1177 0 800-662-7447 0.1223 0.1182 0.0977 0.1238 0.1252 0.1246 0.0003 0.0003 vanguard.com/performance 0.0002 0.0739 0.0755 0.0751 During the periods shown in the bar chart, the highest return for a calendar quarter was 24.96% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;24.14% (quarter ended December 31, 2008). 0.002 0.083 0.0808 0.0677 0.0844 0.0878 0.0851 0.0022 During the periods shown in the bar chart, the highest return for a calendar quarter was 21.53% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.63% (quarter ended December 31, 2008). 0.0022 0.0633 0.0585 0.0509 0.0646 0.0621 0.0649 0.0733 0.0698 0.0594 0.0747 0.0754 0.0751 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 An investment in the Fund could lose money over short or even long periods. 0.23 0.23 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 Example Example 0 Example An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 0 7 5 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 23 16 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: An investment in the Fund could lose money over short or even long periods. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 40 28 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000152 column period compact * ~</div> vanguard.com/performance 0 90 64 20 800-662-7447 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000153 column period compact * ~</div> 23 0 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. highest return 23 64 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000162 column period compact * ~</div> Annual Fund Operating Expenses<br/ ><br/ >(Expenses that you pay each year as a percentage of the value of your investment) 2012-03-31 0.1568 lowest return 71 2015-09-30 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000154 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000163 column period compact * ~</div> 0 -0.0823 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000164 column period compact * ~</div> 0.0006 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000156 column period compact * ~</div> 0 0.0001 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000166 column period compact * ~</div> 800-662-7447 0.0007 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000157 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000032 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000167 column period compact * ~</div> Annual Fund Operating Expenses</br></br>(Expenses that you pay each year as a percentage of the value of your investment) vanguard.com/performance <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000033 column period compact * ~</div> 124 71 113 Example 124 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.0057 0.004 0.004 280 255 0.1225 0.1218 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000034 column period compact * ~</div> 280 0.0755 0.0751 0.0006 7 0 23 40 90 0.0001 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000036 column period compact * ~</div> 0.0007 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000112 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000122 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000113 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000037 column period compact * ~</div> 20 64 -0.0437 113 255 -0.3664 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000123 column period compact * ~</div> 0.136 0.3761 0.0602 0.2163 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000114 column period compact * ~</div> -0.4182 -0.0044 0.4022 0.1591 0.2546 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000124 column period compact * ~</div> 0.3742 -0.0211 0.1384 Example 0.158 -0.0191 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000116 column period compact * ~</div> 0.35 0.136 -0.0146 23 71 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000126 column period compact * ~</div> 124 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 280 Portfolio Turnover <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000117 column period compact * ~</div> The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 8% of the average value of its portfolio. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000127 column period compact * ~</div> After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. highest return highest return 2009-09-30 2009-09-30 0.2153 0.08 0.2496 lowest return lowest return 2008-12-31 -0.2414 -0.2563 Principal Investment Strategies Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 2008-12-31 0.0122 0.0111 0.0111 0.1252 0.1246 0.0754 0.0751 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Value Index, a broadly diversified index predominantly made up of value stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. -0.0181 -0.0086 -0.0086 0.1119 0.1177 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 4% of the average value of its portfolio. Principal Risks -0.0191 -0.0109 -0.0175 -0.0175 0.0621 0.0649 -0.0146 -0.0055 -0.0128 -0.0128 0.1233 0.1164 0.1211 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.57% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;23.82% (quarter ended December 31, 2008). 0.1158 0.1184 0.1137 23 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization value stocks will trail returns from the overall stock market. Large-cap value stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 71 124 0.0799 0.0764 0.078 280 0.0794 0.0807 0.0776 2006-08-24 2006-08-24 2006-08-24 2006-08-24 Portfolio Turnover 0.08 0.04 0.09 Annual Total Returns Portfolio Turnover Portfolio Turnover Average Annual Total Returns for Periods Ended December 31, 2015 Portfolio Turnover 0.04 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 4% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 8% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 9% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Index, a broadly diversified index of large U.S. companies representing approximately the top 85% of the U.S. market capitalization. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Investment Strategies Principal Investment Strategies Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Index, a broadly diversified index of large U.S. companies representing approximately the top 85% of the U.S. market capitalization. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Value Index, a broadly diversified index predominantly made up of value stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Growth Index, a broadly diversified index predominantly made up of growth stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization value stocks will trail returns from the overall stock market. Large-cap value stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization growth stocks will trail returns from the overall stock market. Large-cap growth stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Vanguard Extended Market Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. 0 0 0 0 An investment in the Fund could lose money over short or even long periods. Shareholder Fees<br/><br/>(Fees paid directly from your investment) The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 0 0.0007 0 0.0001 0.0008 Annual Total Returns 0 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 Annual Total Returns Annual Total Returns The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Growth Index, a broadly diversified index predominantly made up of growth stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization growth stocks will trail returns from the overall stock market. Large-cap growth stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.0008 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.0001 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 800-662-7447 0.0009 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000142 column period compact * ~</div> Annual Total Returns &#8212; Vanguard Large-Cap Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Value Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Growth Index Fund Investor Shares Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000143 column period compact * ~</div> During the periods shown in the bar chart, the highest return for a calendar quarter was 15.97% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.11% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 17.38% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;20.44% (quarter ended December 31, 2008). Example During the periods shown in the bar chart, the highest return for a calendar quarter was 15.59% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;23.88% (quarter ended December 31, 2008). The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000144 column period compact * ~</div> vanguard.com/performance 9 29 51 Average Annual Total Returns for Periods Ended December 31, 2015 115 Average Annual Total Returns for Periods Ended December 31, 2015 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Average Annual Total Returns for Periods Ended December 31, 2015 Annual Total Returns &#8212; Vanguard Value Index Fund Institutional Shares 800-662-7447 0.0093 0.0122 0.0111 0.0111 -0.0086 -0.0086 -0.0181 -0.0103 0.0317 0.0423 0.0338 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000146 column period compact * ~</div> 9 vanguard.com/performance 29 During the periods shown in the bar chart, the highest return for a calendar quarter was 17.44% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;20.40% (quarter ended December 31, 2008). 51 0.1223 0.1252 0.1246 0.1177 0.1119 0.1154 115 0.1321 0.1378 0.1296 0.0751 0.0754 0.0733 0.0649 0.0621 0.0633 0.0338 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Average Annual Total Returns for Periods Ended December 31, 2015 0.083 0.0878 0.0851 An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. Annual Total Returns &#8212; Vanguard Large-Cap Index Fund Institutional Shares An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. During the periods shown in the bar chart, the highest return for a calendar quarter was 16.06% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.11% (quarter ended December 31, 2008). Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&amp;P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&amp;P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. highest return Annual Total Returns 0.1744 2009-09-30 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. lowest return Average Annual Total Returns for Periods Ended December 31, 2015 Annual Total Returns &#8212; Vanguard Extended Market Index Fund Admiral Shares -0.204 2008-12-31 During the periods shown in the bar chart, the highest return for a calendar quarter was 21.74% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.58% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 0.2231 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. -0.0327 -0.0335 -0.0342 0.0021 -0.3588 0.1979 0.1449 0.1046 0.1037 0.1024 0.0117 0.078 0.0768 0.079 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 0.152 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.3307 0.1319 -0.0085 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. -0.0085 0.0001 -0.0146 -0.0181 -0.0086 -0.0086 0.06 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.1446 0.0451 -0.3858 0.3769 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000044 column period compact * ~</div> 0.2759 -0.0357 0.185 0.3842 0.0756 -0.0324 0.1172 0.1115 0.0935 0.1119 0.1177 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000046 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000047 column period compact * ~</div> 0.0649 0.0599 0.0523 0.0621 0.0649 Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 0.1443 0.0448 -0.3863 0.3765 0.2757 -0.0359 0.1848 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.3837 0.0756 -0.0327 0.06 An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. Fund Summary An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 Fees and Expenses vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 0.1561 800-662-7447 0.0642 -0.3701 0.2784 Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. 0.1585 0.016 800-662-7447 0.1611 0.3265 0.1341 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. 0.0107 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 800-662-7447 800-662-7447 vanguard.com/performance vanguard.com/performance vanguard.com/performance The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.0107 0.006 0.0099 0.0122 0.0111 0.0111 800-662-7447 vanguard.com/performance vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 0.124 0.1195 0.0991 0.1252 0.1246 After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. -0.0086 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0107 0.0712 0.0607 0.0749 0.0754 0.0751 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.0039 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000062 column period compact * ~</div> Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 0.1318 800-662-7447 0.1338 vanguard.com/performance 0.1256 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000072 column period compact * ~</div> 0.3305 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 0.3266 0.3352 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 0.1518 0.1606 0.1638 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000063 column period compact * ~</div> 0.0114 0.016 0.0108 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000073 column period compact * ~</div> 0.1445 0.1581 0.1726 0.1972 0.278 0.2883 -0.359 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000064 column period compact * ~</div> -0.3705 -0.3699 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000074 column period compact * ~</div> 0.0018 0.0643 0.0557 0.2227 0.1558 0.1563 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000066 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000076 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000067 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000077 column period compact * ~</div> 0.1549 0.0629 Vanguard Growth Index Fund Investment Objective -0.3708 The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization growth stocks. 0.276 Fees and Expenses 0.1563 0.0144 0.1594 0.3245 0.1324 0.0093 highest return 2009-06-30 0.1597 Vanguard Total Stock Market Index Fund lowest return 2008-12-31 -0.2211 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000242 column period compact * ~</div> The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000243 column period compact * ~</div> 0.1549 0.2215 0.0901 0.1551 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000244 column period compact * ~</div> 0.0629 0.0009 0.1256 0.0549 -0.3708 -0.3597 -0.3832 -0.3704 0.276 0.1958 0.3629 0.287 0.1563 0.1428 0.2215 0.1696 0.1709 0.0009 0.0144 0.01 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000246 column period compact * ~</div> -0.3597 0.0171 0.0096 0.1958 0.1594 0.1428 0.15 0.1689 0.01 0.1625 0.15 0.3245 0.3285 0.3285 0.3216 0.3335 0.1305 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000247 column period compact * ~</div> 0.1324 -0.0103 0.1305 0 0.1347 0.1243 0.0093 -0.0103 0 0.0317 0.0029 highest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000252 column period compact * ~</div> 2009-09-30 0.1738 lowest return 2008-12-31 -0.2044 highest return 2009-06-30 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000253 column period compact * ~</div> highest return highest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000262 column period compact * ~</div> highest return 0.1597 2009-09-30 2009-06-30 2009-06-30 lowest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000254 column period compact * ~</div> 0.1738 0.1559 0.1695 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000263 column period compact * ~</div> lowest return lowest return lowest return 2008-12-31 2008-12-31 2008-12-31 2008-12-31 -0.2211 -0.2044 -0.2388 -0.2273 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000264 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000256 column period compact * ~</div> 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000257 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000266 column period compact * ~</div> Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0901 0.1256 -0.3832 Investment Objective 0.3629 0.0006 0.1696 0 0.0171 0.0001 0.1689 0.0007 0.3216 0.1347 The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. 0.0317 highest return 2009-06-30 0.1559 lowest return Example 2008-12-31 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.2388 7 23 40 90 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 9% of the average value of its portfolio. 0.09 Principal Investment Strategies Principal Risks An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Fees and Expenses Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares or Institutional Plus Shares of the Fund. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8217;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 0 0 0 Annual Total Returns &#8212; Vanguard Growth Index Fund Institutional Shares 0 0 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.59% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;23.81% (quarter ended December 31, 2008). 0 0 0 0 0 0 0 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) highest return 2009-06-30 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000303 column period compact * ~</div> 0.1559 lowest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000147 column period compact * ~</div> 2008-12-31 0.0003 0.0002 -0.2381 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000232 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000302 column period compact * ~</div> 0.0001 0 0.0004 0.0002 20 20 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000233 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000304 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000234 column period compact * ~</div> 0.0916 Examples 0.1273 -0.3819 0.365 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000236 column period compact * ~</div> 0.1717 0.0189 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares or Institutional Plus Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.1704 0.3241 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000306 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000237 column period compact * ~</div> 0.1362 0.0333 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000307 column period compact * ~</div> Average Annual Total Returns for Periods Ended December 31, 2015 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed0001471 column period compact * ~</div> 4 2 0.0014 0.0004 13 6 0 0 23 11 51 26 0.0002 0.0001 5 0.0016 0.0005 16 28 Fund Summary 64 0.0333 0.0299 0.0213 0.0423 0.0338 0.0338 0.1314 0.1283 0.1052 0.1378 0.1321 Investment Objective 0.0847 0.0823 0.0691 0.0878 0.0851 The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. Fees and Expenses Examples 4 2 8 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 26 13 6 45 23 11 The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. 103 51 26 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 16 5 8 26 16 52 45 90 28 Portfolio Turnover 103 205 64 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. Example Portfolio Turnover The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000222 column period compact * ~</div> The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Principal Investment Strategies <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000223 column period compact * ~</div> The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s 500 Index, a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000224 column period compact * ~</div> Principal Risks Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 0.03 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified index of stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Investment Strategies Annual Total Returns <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000226 column period compact * ~</div> Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. highest return The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Index, a broadly diversified index of large U.S. companies representing approximately the top 85% of the U.S. market capitalization. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2009-06-30 0.1606 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000227 column period compact * ~</div> lowest return 2008-12-31 Annual Total Returns &#8212; Vanguard 500 Index Fund Investor Shares -0.2211 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.97% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;21.94% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s 500 Index, a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Vanguard Large-Cap ETF The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Investment Objective Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. Fees and Expenses Vanguard Mid-Cap ETF Investment Objective The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Fees and Expenses An investment in the Fund could lose money over short or even long periods. Principal Risks An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.03 7 23 40 Annual Total Returns 90 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The Fund&#8216;s Institutional Plus Shares have not been in operation long enough to report a full calendar-year return. Performance of the Fund&#8216;s Institutional Plus Shares would be substantially similar to that of the Institutional Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Example Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Example This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 4% of the average value of its portfolio. Portfolio Turnover Principal Investment Strategies The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 15% of the average value of its portfolio. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Risks Principal Investment Strategies Principal Risks An investment in the Fund could lose money over short or even long periods. Annual Total Returns Annual Total Returns An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000212 column period compact * ~</div> Annual Total Returns &#8212; Vanguard Large-Cap Index Fund ETF Shares <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000213 column period compact * ~</div> The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. During the periods shown in the bar chart, the highest return for a calendar quarter was 16.04% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.12% (quarter ended December 31, 2008). Annual Total Returns &#8212; Vanguard Mid-Cap Index Fund ETF Shares Average Annual Total Returns for Periods Ended December 31, 2015 During the periods shown in the bar chart, the highest return for a calendar quarter was 21.53% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.62% (quarter ended December 31, 2008). <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000216 column period compact * ~</div> Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Average Annual Total Returns for Periods Ended December 31, 2015 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000217 column period compact * ~</div> Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Annual Total Returns 0.0007 0 0.0001 0.0006 0.0008 0 0.0002 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000292 column period compact * ~</div> 0.0008 8 26 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000293 column period compact * ~</div> 8 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000267 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000312 column period compact * ~</div> 26 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000314 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000296 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000316 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000317 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000297 column period compact * ~</div> 45 45 103 103 ETF Summary Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. -0.0134 -0.0171 -0.0051 -0.0135 -0.0055 -0.0128 -0.0128 Fees and Expenses The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees<br /><br />(Fees paid directly from your investment) 0.0107 0.006 0.0099 0.0105 0.0122 0.0111 0.0111 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.1152 0.1119 0.0916 0.1151 0.1184 0.1158 Annual Fund Operating Expenses<br /><br />(Expenses that you pay each year as a percentage of the value of your investment) 0.1238 0.1194 0.0989 0.1237 0.1246 0.1252 vanguard.com/performance 0.0004 0.0789 0.076 0.0639 0.0789 0.0807 0.0794 0 Fund Summary 800-662-7447 0.0001 Investment Objective 0.0748 0.0711 0.0606 0.0747 0.0754 0.0751 The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. 0.0005 Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Institutional Select Shares of the Fund. Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund Institutional Shares Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. During the periods shown in the bar chart, the highest return for a calendar quarter was 16.98% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.69% (quarter ended December 31, 2008). Portfolio Turnover Fund Summary Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. 0.1569 0.0556 -0.3694 0.2883 0.1723 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. 0.0109 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s 500 Index, a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.1642 0.3349 Principal Risks 0.1256 0.0042 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 7 23 40 90 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. 7 23 40 90 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 800-662-7447 0 vanguard.com/performance 0 0 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0 0 0 0.0001 0.0001 highest return 2009-06-30 0.1698 lowest return 2008-12-31 -0.2269 Annual Total Returns &#8212; Vanguard 500 Index Fund Investor Shares Average Annual Total Returns for Periods Ended December 31, 2015 Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Select Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 1 3 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.97% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;21.94% (quarter ended December 31, 2008). 1 3 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. 0.03 Principal Investment Strategies highest return 2009-06-30 0.1597 lowest return 2008-12-31 -0.2194 Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. 16 5 52 16 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.0042 -0.0006 0.0062 0.0057 0.004 0.004 Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Total Stock Market Index Fund. (Institutional Shares are offered through a separate prospectus.) Performance of the Fund&#8217;s Institutional Select Shares would be substantially similar to that of the Institutional Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. The Spliced Total Stock Market Index reflects performance of the MSCI US Broad Market Index through June 2, 2013, and the CRSP US Total Market Index thereafter. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 90 28 205 64 0.1217 0.1172 0.0971 0.1225 0.1218 0.0752 0.0715 0.061 0.0755 0.0751 The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.1561 0.0644 vanguard.com/performance -0.3702 800-662-7447 0.278 0.1581 Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund Institutional Shares 0.1564 0.0158 0.1609 0.0539 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.3265 0.1569 0.0556 -0.3702 -0.3694 0.2649 0.2883 0.1491 0.0197 0.1723 0.0109 0.1642 0.3349 0.1339 0.1256 0.0107 0.0042 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. highest return 0.1582 During the periods shown in the bar chart, the highest return for a calendar quarter was 16.98% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.69% (quarter ended December 31, 2008). 0.3218 2009-06-30 0.1604 0.1351 0.0125 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. lowest return 2008-12-31 -0.2212 highest return 2009-06-30 0.1698 lowest return 2008-12-31 -0.2269 Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 0.0125 0.0077 0.0109 0.0136 0.0138 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0.124 0.1196 0.0991 0.1253 0.1257 0.0718 0.0681 0.0581 0.073 0.0731 0.0042 -0.0006 0.0062 0.0057 0.004 0.004 0.1217 0.1172 0.0971 0.1225 0.1218 0.0752 0.0715 0.061 0.0755 0.0751 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. An investment in the Fund could lose money over short or even long periods. Annual Total Returns Annual Total Returns &#8212; Vanguard 500 Index Fund ETF Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 12.57% (quarter ended March 31, 2012), and the lowest return for a quarter was &#8211;13.87% (quarter ended September 30, 2011). An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Average Annual Total Returns for Periods Ended December 31, 2015 Example Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 800-662-7447 vanguard.com/performance When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Principal Investment Strategies After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s 500 Index, a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Principal Risks When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Annual Total Returns &#8212; Vanguard 500 Index Fund Admiral Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 15.99% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;21.92% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 0.03 Vanguard Value ETF 0.03 An investment in the Fund could lose money over short or even long periods. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization value stocks. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000214 column period compact * ~</div> The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. 800-662-7447 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000322 column period compact * ~</div> Shareholder Fees<br/><br/>(Fees paid directly from your investment) vanguard.com/performance <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000323 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000283 column period compact * ~</div> Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Example <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000284 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000324 column period compact * ~</div> The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000286 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000326 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000287 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000327 column period compact * ~</div> Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 8% of the average value of its portfolio. An investment in the Fund could lose money over short or even long periods. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Value Index, a broadly diversified index predominantly made up of value stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Principal Risks <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000172 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000182 column period compact * ~</div> An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br/><br/>&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br/><br/>&#149; Investment style risk, which is the chance that returns from large-capitalization value stocks will trail returns from the overall stock market. Large-cap value stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br/><br/>Because ETF Shares are traded on an exchange, they are subject to additional risks:<br/><br/>&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br/><br/>&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br/><br/>&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br/><br/>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000192 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000202 column period compact * ~</div> Vanguard Small-Cap Value ETF 0.03 An investment in the Fund could lose money over short or even long periods. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000173 column period compact * ~</div> 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000183 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000193 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000203 column period compact * ~</div> The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000174 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000184 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000194 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000204 column period compact * ~</div> 800-662-7447 800-662-7447 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000282 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000333 column period compact * ~</div> vanguard.com/performance vanguard.com/performance <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000176 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000186 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000196 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000334 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000206 column period compact * ~</div> Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000336 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000177 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000187 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000197 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000337 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000207 column period compact * ~</div> 0 0 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization value stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. The Fund&#8216;s Institutional Plus Shares have not been in operation long enough to report a full calendar-year return. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Value Index Fund ETF Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 17.43% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;20.42% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0007 0 0.0001 0.0008 The expense information shown in the table reflects estimated amounts for the current fiscal year. 0 0 0 8 26 45 103 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 8 26 45 103 0.2228 0.002 -0.3591 0.1972 0.1445 0.0116 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.1519 0.3303 0.1319 -0.0089 0.0006 0 0.0002 0.0008 -0.0089 -0.015 -0.0001 -0.0092 -0.0181 -0.0086 -0.0086 0.117 0.0933 0.1113 0.1169 0.1119 0.1177 0.0647 0.0597 0.0521 0.0646 0.0621 0.0649 Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Total Stock Market Index Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000313 column period compact * ~</div> 0.08 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. highest return 2009-09-30 0.1743 lowest return 2008-12-31 -0.2042 Vanguard Mid-Cap Value ETF Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization value stocks. Fees and Expenses <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000042 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000092 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000043 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000093 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000094 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000096 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000097 column period compact * ~</div> highest return 2009-09-30 0.1799 lowest return 2008-12-31 -0.2733 Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. highest return 2009-06-30 0.2174 lowest return 2008-12-31 -0.2658 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000052 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000053 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000054 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000056 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000057 column period compact * ~</div> Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.06 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Vanguard Mid-Cap Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 15% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Index, a broadly diversified index of stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Mid-Cap Index Fund Admiral Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 21.54% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.63% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 0.15 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 highest return 2009-09-30 0.2154 lowest return 2008-12-31 -0.2563 0 0 0 0 0.0007 0 0.0001 0.0008 8 26 45 103 8 26 45 103 -0.0134 -0.0055 -0.0128 -0.0128 0.1152 0.1184 0.1158 0.079 0.0807 0.0794 0.1369 0.0617 -0.4178 0.4048 0.2559 -0.0197 0.1599 0.3515 0.1376 -0.0134 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000102 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000103 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000104 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000106 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000107 column period compact * ~</div> 2 6 16 5 52 16 90 28 205 64 Vanguard Extended Market Index Fund Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares or Institutional Plus Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0 0 0 0 0 0 0 0 0.0006 0.0004 0 0 0.0001 0.0001 0.0007 0.0005 Examples The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares or Institutional Plus Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&amp;P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&amp;P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br/><br/>&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br/><br/>&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br/><br/>&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br/><br/>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Extended Market Index Fund Institutional Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 21.78% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.55% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.06 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. highest return 2009-06-30 0.2178 lowest return 2008-12-31 -0.2655 0.1446 0.0451 -0.3858 0.3769 0.2759 -0.0357 0.185 0.3842 0.0756 -0.0324 -0.0324 -0.0362 -0.0165 -0.0335 -0.0342 0.1048 0.1011 0.0827 0.1037 0.1024 0.0783 0.075 0.063 0.0768 0.079 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000132 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000133 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000136 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000137 column period compact * ~</div> 7 5 23 16 40 28 90 64 7 5 23 16 40 28 90 64 -0.0098 -0.0006 -0.0093 -0.0093 0.1442 0.1607 0.1446 2011-09-27 2011-09-27 2011-09-27 2011-09-27 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000048 column period compact * ~</div> -0.0113 -0.0132 -0.0054 -0.0006 -0.0093 -0.0093 0.105 0.1036 0.0834 0.1202 0.1069 0.08 0.079 0.065 0.0887 0.0818 2006-08-24 2006-08-24 2006-08-24 2006-08-24 2006-08-24 2006-08-24 2011-01-14 2011-01-14 -0.0323 -0.0335 0.0989 0.0976 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000138 column period compact * ~</div> 8 26 45 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000332 column period compact * ~</div> 8 26 45 103 0 0 0 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 16% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Value Index, a broadly diversified index of value stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization value stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 8 26 45 Annual Total Returns 103 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Small-Cap Value Index Fund ETF Shares Average Annual Total Returns for Periods Ended December 31, 2015 During the periods shown in the bar chart, the highest return for a calendar quarter was 23.99% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.53% (quarter ended December 31, 2008). Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. -0.0467 -0.052 -0.0236 -0.0467 -0.0514 -0.0464 -0.0464 Fund Summary 0.1041 0.0983 0.0816 0.1039 0.0921 0.1045 Investment Objective 0.0729 0.0676 0.0579 0.073 0.0668 0.0728 The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Institutional Select Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0 0 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0 0 0.0001 0.0001 The expense information shown in the table reflects estimated amounts for the current fiscal year. Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Select Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000402 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000403 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000404 column period compact * ~</div> 8 26 45 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000406 column period compact * ~</div> 8 26 45 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000407 column period compact * ~</div> 0.033 0.0423 0.0338 0.0338 0.1312 0.1378 0.1321 0.0844 0.0878 0.0851 0.194 -0.0696 -0.3199 0.3052 0.2497 -0.0405 0.1878 0.3657 0.1055 -0.0467 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0.16 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Growth Index, a broadly diversified index of growth stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization growth stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Index, a broadly diversified index of stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.04 1 3 1 3 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. 0.03 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s 500 Index, a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization stocks will trail returns from the overall stock market. Large-cap stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Admiral&#8482; Shares of Vanguard 500 Index Fund. (Admiral Shares are offered through a separate prospectus.) Performance of the Fund&#8216;s Institutional Select Shares would be substantially similar to that of the Admiral Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Value Index, a broadly diversified index of value stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization value stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. highest return 2009-09-30 0.2399 lowest return 2008-12-31 -0.2553 An investment in the Fund could lose money over short or even long periods. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Vanguard Small-Cap Growth Index Fund vanguard.com/performance Investment Objective 800-662-7447 The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization growth stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Admiral&#8482; Shares of Vanguard 500 Index Fund. (Admiral Shares are offered through a separate prospectus.) Performance of the Fund&#8216;s Institutional Select Shares would be substantially similar to that of the Admiral Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Admiral&#8482; Shares of Vanguard 500 Index Fund. Annual Total Returns &#8212; Vanguard 500 Index Fund Admiral Shares 0.1575 0.0547 -0.3697 0.2662 0.1505 0.0208 0.1596 0.3233 0.1364 0.0136 highest return 2009-06-30 0.1599 lowest return 2008-12-31 -0.2192 During the periods shown in the bar chart, the highest return for a calendar quarter was 15.99% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;21.92% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 0.0913 0.127 -0.3822 0.3642 0.1712 0.0187 0.1701 0.324 0.1363 0.033 highest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000432 column period compact * ~</div> 2009-06-30 0.1557 lowest return 0 0 2008-12-31 -0.2382 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000433 column period compact * ~</div> 0 0 0 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000434 column period compact * ~</div> 20 20 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000436 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000437 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000272 column period compact * ~</div> 0.0136 0.0086 0.0118 0.0138 0.1253 0.1206 0.1002 0.1257 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000273 column period compact * ~</div> 0.073 0.0691 0.0591 0.0731 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000274 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000277 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000276 column period compact * ~</div> 0.0017 0.0006 0 0 0.0003 0.0002 0.002 0.0008 Examples The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000452 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000453 column period compact * ~</div> 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000454 column period compact * ~</div> 0 0 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000456 column period compact * ~</div> 20 8 64 26 113 45 255 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000457 column period compact * ~</div> 20 8 64 26 113 45 255 103 0 0 0.0014 0 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 0.0002 0.0016 16 16 52 90 205 52 90 205 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Portfolio Turnover 0.15 0.0125 0.0138 0.124 0.1257 An investment in the Fund could lose money over short or even long periods. 0.0718 0.0731 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.23 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Principal Investment Strategies Principal Risks vanguard.com/performance 800-662-7447 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.1369 0.0614 -0.4179 0.4049 0.2557 -0.0196 0.1598 0.3515 0.1376 -0.0134 highest return 2009-09-30 lowest return 2008-12-31 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. -0.2562 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.1564 0.0539 -0.3702 0.2649 vanguard.com/performance 0.1491 800-662-7447 0.0197 0.1582 0.3218 0.1351 0.0125 highest return 2009-06-30 0.1597 Annual Total Returns &#8212; Vanguard Small-Cap Growth Index Fund Investor Shares lowest return 2008-12-31 -0.2194 Vanguard Small-Cap Growth Index Fund Vanguard Small-Cap Index Fund During the periods shown in the bar chart, the highest return for a calendar quarter was 24.63% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;27.95% (quarter ended December 31, 2008). Vanguard Small-Cap Value Index Fund Investment Objective Investment Objective highest return Investment Objective 2009-06-30 0.2463 lowest return The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization growth stocks. 2008-12-31 The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization value stocks. -0.2795 Fees and Expenses Fees and Expenses Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares or Institutional Plus Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0.1194 0.0963 -0.4 0.4185 0.3069 -0.0158 0.1752 0.3798 0 0.0388 -0.0264 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000372 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000342 column period compact * ~</div> 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000343 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000373 column period compact * ~</div> 0 0 0 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000374 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000344 column period compact * ~</div> 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000376 column period compact * ~</div> 0 Average Annual Total Returns for Periods Ended December 31, 2015 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000377 column period compact * ~</div> Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0017 0 0.0003 0.002 0.0006 0.0004 0 0 -0.0264 -0.029 -0.014 -0.0305 -0.026 -0.026 0.0006 0.0001 0.0001 0 0.1005 0.0984 0.0793 0.1117 0.1009 0.0007 0.0005 0.0822 0.0807 0.0668 0.0878 0.0825 0.0001 0.0007 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000346 column period compact * ~</div> Example Examples <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000347 column period compact * ~</div> Vanguard Mid-Cap Growth ETF Example Vanguard Small-Cap Growth ETF Vanguard Small-Cap Index Fund Vanguard Small-Cap Value Index Fund The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Investment Objective The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares or Institutional Plus Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Investment Objective The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Investment Objective Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization growth stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization growth stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization value stocks. 20 Fees and Expenses Fees and Expenses Fees and Expenses 7 Fees and Expenses 64 The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 7 5 113 23 23 16 40 255 40 28 90 90 64 7 5 23 16 40 28 90 64 20 64 113 255 7 23 40 90 0.23 0.11 0.16 -0.0252 -0.0305 -0.026 -0.026 Portfolio Turnover Portfolio Turnover 0.145 0.157 0.1438 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 11% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 16% of the average value of its portfolio. 2011-09-27 2011-09-27 2011-09-27 2011-09-27 Principal Investment Strategies Principal Investment Strategies Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Growth Index, a broadly diversified index of growth stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Index, a broadly diversified index of stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Value Index, a broadly diversified index of value stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks Principal Risks Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization growth stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization value stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 8 26 45 103 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Annual Total Returns Annual Total Returns Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 0 Annual Total Returns &#8212; Vanguard Small-Cap Growth Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Small-Cap Index Fund Institutional Shares Annual Total Returns &#8212; Vanguard Small-Cap Value Index Fund Institutional Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 24.63% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;27.95% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 24.21% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.64% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 24.03% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.55% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. -0.0264 -0.0305 -0.026 -0.026 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.1005 0.1117 0.1009 -0.0363 -0.0405 -0.0186 -0.0406 -0.0368 -0.0368 0.0822 0.0878 0.0825 0.104 0.1023 0.0822 0.1003 0.1045 -0.0467 -0.052 -0.0236 -0.0514 -0.0464 -0.0464 0 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Index, a broadly diversified index of stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 0 Vanguard Small-Cap ETF 0.1045 0.0921 0.0818 0.0985 0.1043 Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. 0 0 0 0 Fees and Expenses 0 0 0 0 20 20 The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0 0 Example 0 0 20 20 The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. Portfolio Turnover Vanguard Growth ETF The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 11% of the average value of its portfolio. Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of large-capitalization growth stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. 0.0798 0.0761 0.0641 0.0779 0.0787 Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Small-Cap Index Fund ETF Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 24.19% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.63% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 -0.0362 -0.0406 -0.0368 -0.0368 0.1047 0.1023 0.104 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.1057 0.1033 0.105 0.0006 0 0.0002 0.0008 Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0 0 0 8 26 45 103 0.0733 0.0679 0.0581 0.0668 0.0728 8 26 45 103 0.0007 0 0.0001 0.0008 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000512 column period compact * ~</div> Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 9% of the average value of its portfolio. 0.0006 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Large Cap Growth Index, a broadly diversified index predominantly made up of growth stocks of large U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.0006 Principal Risks <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000513 column period compact * ~</div> An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from large-capitalization growth stocks will trail returns from the overall stock market. Large-cap growth stocks tend to go through cycles of doing better&#8212;or worse&#8212;than other segments of the stock market or the stock market in general. These periods have, in the past, lasted for as long as several years.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0017 0.0006 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0017 0.0006 0 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000514 column period compact * ~</div> 0 0 0.0002 0.0002 0.0003 0.0002 0.0003 0.0002 0.0008 0.0008 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000516 column period compact * ~</div> 0.002 0.0008 0.002 0.0008 Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Growth Index Fund ETF Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 15.60% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;23.83% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000517 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000518 column period compact * ~</div> 0.0136 0.0138 0.1253 0.1257 0.0913 Examples 0.073 0.0731 0.1268 Examples Example The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. Example -0.3822 The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following examples are intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. These examples assume that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.3646 The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Shareholder Fees<br/><br/>(Fees paid directly from your investment) The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 0.1711 0.0187 0.1703 0.3238 0.1362 0.0332 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0004 0 0.0001 0.0005 0 0 0 20 8 0 64 26 113 45 255 103 20 8 64 26 113 45 5 255 103 5 16 16 28 28 64 64 0.1575 0.0547 -0.3697 0.2662 0.1505 0.0208 0.1596 0.3233 0.1364 0.0136 20 8 64 26 113 45 255 103 20 8 highest return 64 26 113 45 255 103 lowest return 2009-06-30 2008-12-31 0.1599 -0.2192 8 8 26 26 45 45 103 8 26 103 45 103 8 -0.0365 -0.0407 -0.0187 -0.0367 -0.0406 -0.0368 -0.0368 26 45 0.1043 0.1001 0.082 0.1041 0.1023 0.104 103 8 26 0.0795 0.0758 0.0639 0.0797 0.0779 0.0787 45 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000352 column period compact * ~</div> 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000353 column period compact * ~</div> Portfolio Turnover Portfolio Turnover <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000354 column period compact * ~</div> Vanguard Small-Cap Index Fund Investment Objective This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000356 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000357 column period compact * ~</div> Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Average Annual Total Returns for Periods Ended December 31, 2015 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 11% of the average value of its portfolio. 0.0332 0.0298 0.0212 0.033 0.0423 0.0338 0.0338 Example The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 16% of the average value of its portfolio. Portfolio Turnover 0.1312 0.1281 0.1051 0.1312 0.1378 0.1321 Portfolio Turnover The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. 0.0844 0.082 0.0689 0.0845 0.0878 0.0851 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. 0 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0 0 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Portfolio Turnover Principal Investment Strategies Principal Investment Strategies The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 20% of the average value of its portfolio. Principal Investment Strategies Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Growth Index, a broadly diversified index of growth stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Growth Index, a broadly diversified index of growth stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Index, a broadly diversified index of stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.1194 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Value Index, a broadly diversified index of value stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.0963 Principal Investment Strategies -0.4 0.4185 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Mid Cap Value Index, a broadly diversified index of value stocks of mid-size U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.3069 -0.0158 0.1752 Principal Risks 0.3798 0.0388 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br/><br/>&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br/><br/>&#149; Investment style risk, which is the chance that returns from mid-capitalization value stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br/><br/>Because ETF Shares are traded on an exchange, they are subject to additional risks:<br/><br/>&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br/><br/>&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br/><br/>&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br/><br/>An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. -0.0264 0.0017 highest return 2009-06-30 0 0.2463 Annual Total Returns Principal Risks lowest return 0.0003 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2008-12-31 Principal Risks 0.002 Principal Risks -0.2795 Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from mid-capitalization growth stocks will trail returns from the overall stock market. Historically, mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization growth stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Example An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization value stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 2010-12-17 2010-12-17 2010-12-17 2010-12-17 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 20 64 113 255 Annual Total Returns &#8212; Vanguard Mid-Cap Value Index Fund ETF Shares Portfolio Turnover An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. During the periods shown in the bar chart, the highest return for a calendar quarter was 25.04% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;24.07% (quarter ended December 31, 2008). The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 11% of the average value of its portfolio. 0.11 Principal Investment Strategies Principal Risks Average Annual Total Returns for Periods Ended December 31, 2015 0.1582 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0129 -0.3598 0.364 0.2795 -0.0265 0.1826 0.378 0.0753 -0.0363 highest return Vanguard Total Stock Market ETF 2009-06-30 0.2421 Vanguard Extended Market ETF lowest return Investment Objective 2008-12-31 Investment Objective -0.2664 The Fund seeks to track the performance of a benchmark index that measures the investment return of the overall stock market. The Fund seeks to track the performance of a benchmark index that measures the investment return of small- and mid-capitalization stocks. Fees and Expenses Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. The following table describes the fees and expenses you may pay if you buy and hold ETF Shares of the Fund. An investment in the Fund could lose money over short or even long periods. Shareholder Fees<br/><br/>(Fees paid directly from your investment) An investment in the Fund could lose money over short or even long periods. Shareholder Fees<br/><br/>(Fees paid directly from your investment) An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.1944 -0.0689 -0.3202 0.3071 0.2497 -0.0397 0.1878 0.3655 0.1059 -0.0467 highest return 2009-09-30 0.2403 lowest return 2008-12-31 -0.2555 0 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0.09 0 0 An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 0 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. vanguard.com/performance 800-662-7447 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Total Returns &#8212; Vanguard Small-Cap Index Fund Investor Shares The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Annual Total Returns Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Annual Total Returns During the periods shown in the bar chart, the highest return for a calendar quarter was 24.09% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.66% (quarter ended December 31, 2008). Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.0004 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0.0007 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0 0.0001 0.0002 0.0005 0.0009 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. highest return 2009-06-30 0.2153 Example Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.2409 Example lowest return The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: 2008-12-31 The following example is intended to help you compare the cost of investing in the Fund&#8217;s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: -0.2666 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 5 9 16 800-662-7447 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 29 Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 28 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 51 800-662-7447 800-662-7447 64 115 800-662-7447 vanguard.com/performance vanguard.com/performance vanguard.com/performance When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. highest return 2009-06-30 0.156 lowest return When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 2008-12-31 -0.2383 After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Please note that after-tax returns are shown only for the Institutional Shares and may differ for each share class. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000412 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000413 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000414 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000416 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000417 column period compact * ~</div> 0 0 0 0.0006 0 0.0002 0.0008 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0.1564 0.0116 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. -0.3607 5 9 0.3612 16 29 0.2772 28 51 -0.028 Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. 64 115 0.1804 0.3762 0.0737 Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. -0.0378 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. Portfolio Turnover Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 3% of the average value of its portfolio. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 6% of the average value of its portfolio. Annual Total Returns &#8212; Vanguard Mid-Cap Growth Index Fund ETF Shares 0.03 Annual Total Returns &#8212; Vanguard Small-Cap Growth Index Fund ETF Shares Annual Total Returns &#8212; Vanguard Small-Cap Index Fund Investor Shares Annual Total Returns &#8212; Vanguard Small-Cap Value Index Fund Investor Shares 0.06 Principal Investment Strategies -0.0378 -0.0406 -0.0368 -0.0368 8 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Total Market Index, which represents approximately 100% of the investable U.S. stock market and includes large-, mid-, small-, and micro-cap stocks regularly traded on the New York Stock Exchange and Nasdaq. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These key characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. 0.1028 0.1023 0.104 26 The Fund employs an indexing investment approach designed to track the performance of the Standard &amp; Poor&#8216;s Completion Index, a broadly diversified index of stocks of small and mid-size U.S. companies. The S&amp;P Completion Index contains all of the U.S. common stocks regularly traded on the New York Stock Exchange and the Nasdaq over-the-counter market, except those stocks included in the S&amp;P 500 Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key characteristics. These characteristics include industry weightings and market capitalization, as well as certain financial measures, such as price/earnings ratio and dividend yield. Principal Risks 45 0.0781 0.0779 0.0787 Principal Risks 103 An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small- and mid-capitalization stocks will trail returns from the overall stock market. Historically, small-and mid-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small and mid-size companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />&#149; Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&#8217;s target index. Index sampling risk for the Fund should be low.<br /><br />Because ETF Shares are traded on an exchange, they are subject to additional risks:<br /><br />&#149; The Fund&#8217;s ETF Shares are listed for trading on NYSE Arca and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.<br /><br />&#149; Although the Fund&#8217;s ETF Shares are listed for trading on NYSE Arca, it is possible that an active trading market may not be maintained.<br /><br />&#149; Trading of the Fund&#8217;s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund&#8217;s ETF Shares may also be halted if (1) the shares are delisted from NYSE Arca without first being listed on another exchange or (2) NYSE Arca officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. During the periods shown in the bar chart, the highest return for a calendar quarter was 18.04% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;27.31% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 24.60% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;27.91% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 24.09% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.66% (quarter ended December 31, 2008). During the periods shown in the bar chart, the highest return for a calendar quarter was 23.89% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.57% (quarter ended December 31, 2008). -0.0427 -0.3653 0.3775 0 0.2183 -0.0032 0 0.1604 0 0.3765 0.1398 -0.018 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000462 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000463 column period compact * ~</div> This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. An investment in the Fund could lose money over short or even long periods. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000464 column period compact * ~</div> Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0.0209 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000466 column period compact * ~</div> 0.1598 0.3233 -0.018 -0.0231 -0.0067 -0.018 -0.0109 -0.0175 -0.0175 0.1363 0.0135 0.1225 0.1179 0.0976 0.1224 0.1164 0.1233 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000467 column period compact * ~</div> highest return lowest return 0.0786 0.0743 0.063 0.0786 0.0756 0.0791 0.1257 -0.1387 2012-03-31 2011-09-30 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000562 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000563 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000564 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000566 column period compact * ~</div> The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000567 column period compact * ~</div> Principal Investment Strategies 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 Principal Risks The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and a comparative index, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. vanguard.com/performance vanguard.com/performance 800-662-7447 800-662-7447 Annual Total Returns &#8212; Vanguard Total Stock Market Index Fund ETF Shares Annual Total Returns &#8212; Vanguard Extended Market Index Fund ETF Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 16.96% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;22.71% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 During the periods shown in the bar chart, the highest return for a calendar quarter was 21.73% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.54% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 Average Annual Total Returns for Periods Ended December 31, 2015 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 0.0135 0.0085 0.0118 0.0132 0.0138 0.1253 0.1002 0.1252 0.1257 0.1206 0.1489 0.1441 0.1204 0.1489 0.1493 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 2010-09-07 2010-09-07 2010-09-07 2010-09-07 2010-09-07 0.1566 0.1446 0.0556 8 0.0449 -0.3697 26 -0.386 0.2882 45 0.3763 103 0.1726 0.2755 0.0106 -0.0361 0.1641 0.1848 0.3351 0.3837 0.1256 0.0755 0.004 -0.0326 Shareholder Fees<br/><br/>(Fees paid directly from your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) highest return highest return 2009-06-30 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000552 column period compact * ~</div> 2009-06-30 0.1696 0.2173 lowest return lowest return <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000553 column period compact * ~</div> 2008-12-31 -0.2654 2008-12-31 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000554 column period compact * ~</div> -0.2271 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000556 column period compact * ~</div> Average Annual Total Returns for Periods Ended December 31, 2015 0.2 Average Annual Total Returns for Periods Ended December 31, 2015 This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. vanguard.com/performance Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000522 column period compact * ~</div> When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000523 column period compact * ~</div> Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000524 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000526 column period compact * ~</div> When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000527 column period compact * ~</div> Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. highest return 0.004 -0.0007 0.0061 0.0037 0.0057 0.004 0.004 2009-09-30 0.2504 lowest return 2008-12-31 -0.2407 -0.0326 -0.0364 -0.0167 -0.0326 -0.0342 -0.0335 0.1216 0.1171 0.0971 0.1215 0.1225 0.1218 0.1045 0.1009 0.0824 0.1045 0.1037 0.1024 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. 0.0751 0.0714 0.0609 0.0751 0.0755 0.0751 0.078 0.0748 0.0628 0.0781 0.0768 0.079 Vanguard Small-Cap Value Index Fund Investment Objective After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Please note that after-tax returns are shown only for the Investor Shares and may differ for each share class. The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization value stocks. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Investor Shares of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000442 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000443 column period compact * ~</div> 0.11 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000444 column period compact * ~</div> This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000446 column period compact * ~</div> Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Example An investment in the Fund could lose money over short or even long periods. Portfolio Turnover Principal Investment Strategies Principal Risks An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Average Annual Total Returns for Periods Ended December 31, 2015 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0 0 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. vanguard.com/performance Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 800-662-7447 -0.01 -0.0122 -0.0044 -0.0101 -0.0006 -0.0093 -0.0093 0.1065 0.1048 0.0846 0.1064 0.1202 0.1069 0.0797 0.0784 0.0647 0.0797 0.0869 0.08 0.0017 0 0.0003 0.002 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 2006-08-17 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Investor Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. 20 64 113 255 The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 16% of the average value of its portfolio. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000546 column period compact * ~</div> 0.16 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000547 column period compact * ~</div> 0 0 0 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000544 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000543 column period compact * ~</div> 0.1579 0.0127 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000542 column period compact * ~</div> -0.3599 0.3631 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000447 column period compact * ~</div> 0.2789 -0.0268 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.1822 0.378 Annual Total Returns 0.0751 -0.0365 highest return 2009-06-30 0.2419 lowest return The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2008-12-31 -0.2663 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000362 column period compact * ~</div> The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Investor Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Investor Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000363 column period compact * ~</div> Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. vanguard.com/performance 800-662-7447 Annual Total Returns &#8212; Vanguard Small-Cap Value Index Fund Investor Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 23.89% (quarter ended September 30, 2009), and the lowest return for a quarter was &#8211;25.57% (quarter ended December 31, 2008). When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000366 column period compact * ~</div> Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000367 column period compact * ~</div> Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. highest return 2009-09-30 0.2389 lowest return 2008-12-31 -0.2557 0.1924 -0.0707 -0.3205 0.3034 0.2482 -0.0416 0.1856 0.3641 0.1039 -0.0478 -0.0251 -0.0282 -0.0132 -0.0257 -0.026 -0.0305 -0.026 0.102 0.0995 0.0805 0.1017 0.1117 0.1009 0.0836 0.0817 0.0679 0.0837 0.0878 0.0825 -0.0478 -0.0514 -0.0464 -0.0464 0.1026 0.0921 0.1045 0.0715 0.0668 0.0728 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000382 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000383 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000384 column period compact * ~</div> -0.0378 -0.0416 -0.0196 -0.0364 -0.0406 -0.0368 -0.0368 0.1028 0.099 0.0809 0.1043 0.1023 0.104 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000386 column period compact * ~</div> 0.0781 0.0748 0.0627 0.0795 0.0779 0.0787 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000387 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000422 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000423 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000364 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000557 column period compact * ~</div> 5 5 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000558 column period compact * ~</div> 16 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000424 column period compact * ~</div> 16 28 28 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000392 column period compact * ~</div> 64 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000426 column period compact * ~</div> 64 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000393 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000427 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000394 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000396 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000397 column period compact * ~</div> -0.0478 -0.0527 -0.0244 -0.0514 -0.0464 -0.0464 0.1026 0.0972 0.0804 0.0921 0.1045 0.0715 0.0666 0.0568 0.0668 0.0728 -0.0465 -0.0514 -0.0464 -0.0464 0.16 0.1452 0.1604 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s ETF Shares (based on NAV) has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the ETF Shares compare with those of the Fund&#8216;s target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. 2011-09-27 2011-09-27 2011-09-27 2011-09-27 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000532 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000533 column period compact * ~</div> 8 26 45 103 <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000534 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000536 column period compact * ~</div> 0.1744 -0.4702 0.4285 0.2911 -0.037 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000537 column period compact * ~</div> 0.1594 0.3223 0.1349 -0.01 highest return 2009-09-30 0.1804 lowest return 2008-12-31 -0.2731 0.1203 0.0974 -0.3992 0.4202 0.3087 -0.0143 0.1767 0.3818 0.0402 -0.0251 highest return 2009-06-30 0.246 lowest return 2008-12-31 -0.2791 0.1564 0.0116 -0.3607 0.3612 0.2772 -0.028 0.1804 0.3762 0.0737 -0.0378 highest return 2009-06-30 0.2409 lowest return 2008-12-31 -0.2666 0.1924 -0.0707 -0.3205 0.3034 0.2482 0.1856 -0.0416 0.3641 0.1039 -0.0478 highest return 2009-09-30 0.2389 lowest return 2008-12-31 -0.2557 Vanguard Small-Cap Growth Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization growth stocks. Fees and Expenses The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0 0 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 0.0006 0 Vanguard Small-Cap Value Index Fund 0.0001 0.0007 Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization value stocks. Fees and Expenses Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) 7 23 40 90 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) 7 23 40 90 Example Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Growth Index, a broadly diversified index of growth stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization growth stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Small-Cap Growth Index Fund Institutional Shares The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 16% of the average value of its portfolio. During the periods shown in the bar chart, the highest return for a calendar quarter was 24.59% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;27.91% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 Principal Investment Strategies -0.0252 -0.0283 -0.0132 -0.0305 -0.026 -0.026 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Value Index, a broadly diversified index of value stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 0.1021 0.0996 0.0806 0.1117 0.1009 0.0839 0.082 0.0682 0.0878 0.0825 Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization value stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Small-Cap Value Index Fund Admiral Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 13.30% (quarter ended March 31, 2013), and the lowest return for a quarter was &#8211;9.12% (quarter ended September 30, 2015). Average Annual Total Returns for Periods Ended December 31, 2015 0.1209 0.0978 -0.3991 0.4213 0.3096 -0.014 0.1768 0.382 0.0404 -0.0252 0.16 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. highest return 2013-03-31 0.133 0.23 lowest return 2015-09-30 -0.0912 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0 0 0 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Institutional Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Institutional Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.0006 Keep in mind that the Fund&#8217;s past performance (before and after taxes) does not indicate how the Fund will perform in the future. 0 800-662-7447 0.0002 vanguard.com/performance 0.0008 8 26 45 103 8 26 45 103 highest return 2009-06-30 0.2459 lowest return 2008-12-31 -0.2791 0.1877 0.3658 0.1055 -0.0465 When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder. -0.0465 -0.0514 -0.0464 -0.0464 0.16 0.1452 0.1604 2011-09-27 2011-09-27 2011-09-27 2011-09-27 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000592 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000593 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000594 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000596 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000597 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000572 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000573 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000574 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000576 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000577 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000472 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000482 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000492 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000502 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000473 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000483 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000493 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000503 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000474 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000484 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000494 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000504 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000476 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000486 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000496 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000506 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000477 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000487 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000497 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000507 column period compact * ~</div> This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. This example does not include the brokerage commissions that you may pay to buy and sell ETF Shares of the Fund. 0.23 0.23 Vanguard Small-Cap Growth Index Fund Vanguard Small-Cap Index Fund Investment Objective The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. Fees and Expenses Investment Objective The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. Shareholder Fees<br/><br/>(Fees paid directly from your investment) The Fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization growth stocks. Fees and Expenses 0 The following table describes the fees and expenses you may pay if you buy and hold Admiral Shares of the Fund. 0 Shareholder Fees<br/><br/>(Fees paid directly from your investment) 0 0 Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Annual Fund Operating Expenses<br/><br/>(Expenses that you pay each year as a percentage of the value of your investment) Example 0.0006 0 0.0002 0.0008 The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Portfolio Turnover Example The following example is intended to help you compare the cost of investing in the Fund&#8217;s Admiral Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invested $10,000 in the Fund&#8217;s shares. This example assumes that the Shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 23% of the average value of its portfolio. 8 26 45 103 Principal Investment Strategies The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Growth Index, a broadly diversified index of growth stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. 8 26 45 103 Principal Risks Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &#8220;turns over&#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund&#8217;s performance. During the most recent fiscal year, the Fund&#8217;s portfolio turnover rate was 11% of the average value of its portfolio. -0.0109 -0.0175 -0.0175 Principal Investment Strategies An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization growth stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 0.1626 0.171 The Fund employs an indexing investment approach designed to track the performance of the CRSP US Small Cap Index, a broadly diversified index of stocks of small U.S. companies. The Fund attempts to replicate the target index by investing all, or substantially all, of its assets in the stocks that make up the Index, holding each stock in approximately the same proportion as its weighting in the Index. Principal Risks An investment in the Fund could lose money over short or even long periods. You should expect the Fund&#8217;s share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund&#8217;s performance:<br /><br />&#149; Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. The Fund&#8217;s target index tracks a subset of the U.S. stock market, which could cause the Fund to perform differently from the overall stock market. In addition, the Fund&#8217;s target index may, at times, become focused in stocks of a particular market sector, which would subject the Fund to proportionately higher exposure to the risks of that sector.<br /><br />&#149; Investment style risk, which is the chance that returns from small-capitalization stocks will trail returns from the overall stock market. Historically, small-cap stocks have been more volatile in price than the large-cap stocks that dominate the overall market, and they often perform quite differently. Small companies tend to have greater stock volatility because, among other things, these companies are more sensitive to changing economic conditions.<br /><br />An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Annual Total Returns The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. -0.0364 -0.0406 -0.0368 -0.0368 0.1043 0.1023 0.104 Annual Total Returns 0.0795 0.0779 0.0787 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. Annual Total Returns &#8212; Vanguard Small-Cap Growth Index Fund Admiral Shares 2011-09-27 2011-09-27 2011-09-27 During the periods shown in the bar chart, the highest return for a calendar quarter was 13.81% (quarter ended March 31, 2012), and the lowest return for a quarter was &#8211;11.69% (quarter ended September 30, 2015). Average Annual Total Returns for Periods Ended December 31, 2015 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000038 column period compact * ~</div> 0.1766 0.3822 0.0402 -0.0252 8 26 45 103 0.1577 0.0124 -0.36 0.3633 0.2789 0.23 -0.0269 0.1824 0.3781 An investment in the Fund could lose money over short or even long periods. 0.075 -0.0364 An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0.11 800-662-7447 vanguard.com/performance Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. highest return 2012-03-31 0.1381 lowest return 2015-09-30 -0.1169 0.11 An investment in the Fund could lose money over short or even long periods. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 20 64 113 255 20 64 113 255 0.16 0 The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund&#8216;s Admiral Shares has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the Admiral Shares compare with those of the Fund&#8216;s target index and other comparative indexes, which have investment characteristics similar to those of the Fund. 0 Keep in mind that the Fund&#8217;s past performance does not indicate how the Fund will perform in the future. 800-662-7447 0 vanguard.com/performance 0 0.0006 0 0.0002 0.0008 highest return 2009-06-30 0.2415 lowest return 2008-12-31 -0.2664 8 26 45 103 Annual Total Returns &#8212; Vanguard Small-Cap Index Fund Admiral Shares During the periods shown in the bar chart, the highest return for a calendar quarter was 24.15% (quarter ended June 30, 2009), and the lowest return for a quarter was &#8211;26.64% (quarter ended December 31, 2008). Average Annual Total Returns for Periods Ended December 31, 2015 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000602 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000603 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000604 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000606 column period compact * ~</div> -0.018 0.1702 <div style="display:none">~ http://www.vanguard.com/role/ScheduleShareholderFees000582 column period compact * ~</div> 2011-09-27 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualFundOperatingExpenses000583 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000584 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAnnualTotalReturnsBarChart000586 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000587 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000508 column period compact * ~</div> -0.0252 -0.0305 -0.026 -0.026 0.145 0.157 0.1438 2011-09-27 2011-09-27 2011-09-27 2011-09-27 <div style="display:none">~ http://www.vanguard.com/role/ScheduleAverageAnnualTotalReturnsTransposed000607 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000134 column period compact * ~</div> <div style="display:none">~ http://www.vanguard.com/role/ScheduleExpenseExampleTransposed000294 column period compact * ~</div> 7 23 40 90 Because the Fund&#8217;s Institutional Select Shares have not yet begun operations, the information presented in the bar chart and table reflects the performance of the Institutional Shares of Vanguard Total Stock Market Index Fund. (Institutional Shares are offered through a separate prospectus.) Performance of the Fund&#8217;s Institutional Select Shares would be substantially similar to that of the Institutional Shares because both share classes constitute an investment in the same portfolio of securities; their returns generally should differ only to the extent that the expenses of the two share classes differ. /year Comparative Indexes (reflect no deduction for fees, expenses, or taxes) The expense information shown in the table reflects estimated amounts for the current fiscal year. Comparative Indexes (reflect no deduction for fees or expenses) None through Vanguard (Broker fees vary) 0.00%