14. Earnings per Share The following table presents the calculation of basic and diluted earnings per share: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Nine Months Ended | | (MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA) | | September 30, | | September 30, | | 2022 | | 2021 | | 2022 | | 2021 | | Numerator | | | | | | | | | | Net income before allocation to noncontrolling interests | | $ | 528 | | | $ | 552 | | | $ | 1,651 | | | $ | 1,621 | | | Less: Net loss attributable to noncontrolling interests | | (1) | | | — | | | (2) | | | (2) | | | Net income attributable to Zoetis Inc. | | $ | 529 | | | $ | 552 | | | $ | 1,653 | | | $ | 1,623 | | | Denominator | | | | | | | | | | Weighted-average common shares outstanding | | 467.8 | | | 474.0 | | | 470.0 | | | 474.8 | | | Common stock equivalents: stock options, RSUs, PSUs and DSUs | | 1.3 | | | 2.3 | | | 1.6 | | | 2.3 | | | Weighted-average common and potential dilutive shares outstanding | | 469.1 | | | 476.3 | | | 471.6 | | | 477.1 | | | | | | | | | | | | Earnings per share attributable to Zoetis Inc. stockholders—basic | | $ | 1.13 | | | $ | 1.16 | | | $ | 3.52 | | | $ | 3.42 | | | Earnings per share attributable to Zoetis Inc. stockholders—diluted | | $ | 1.13 | | | $ | 1.16 | | | $ | 3.51 | | | $ | 3.40 | |
The number of stock options outstanding under the company's Equity Plan that were excluded from the computation of diluted earnings per share, as the effect would have been antidilutive, were de minimis for the three and nine months ended September 30, 2022 and 2021.
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