Gateway Equity Call Premium FundGateway Equity Call Premium FundGateway FundGateway FundDmultiaffiliatestatutoryprospectus_4824Gateway Trust - Classes A, C, N, and YDmultiaffiliatefundssai_48235-1 Multi-Affiliate Funds_SAIClass A - C000146363AClass C - C000146364CClass N - C000190731NClass T - C000188543TClass Y - C000146365YClass A - C000052969AClass C - C000052970CClass N - C000190730NClass T - C000188542TClass Y - C000052971YCall Options RiskCall Options RiskCBOE S&P 500 BuyWrite Index (BXM)CBOE S&P 500 BuyWrite Index (BXM)Options RiskOptions RiskCorrelation RiskCorrelation RiskIssuer Exposure RiskIssuer Exposure RiskS&P 500® IndexS&P 500® IndexBloomberg U.S. Aggregate Bond IndexBloomberg U.S. Aggregate Bond IndexInvestments in Other Investment Companies RiskInvestments in Other Investment Companies RiskEquity Securities RiskEquity Securities RiskMarket/Issuer RiskMarket/Issuer RiskManagement RiskManagement RiskCybersecurity and Technology RiskCybersecurity and Technology RiskForeign Securities RiskForeign Securities RiskLarge Shareholder Transaction RiskLarge Shareholder Transaction RiskREITs RiskREITs Risk