Year Ended December 31,

(MILLIONS OF DOLLARS AND SHARES, EXCEPT PER SHARE DATA)

2021

2020

2019

Numerator

Net income before allocation to noncontrolling interests

$

2,034

$

1,636

$

1,500

Less: net loss attributable to noncontrolling interests

(3)

(2)

—

Net income attributable to Zoetis Inc.

$

2,037

$

1,638

$

1,500

Denominator

Weighted-average common shares outstanding

474.348

475.502

478.128

Common stock equivalents: stock options, RSUs, DSUs and PSUs

2.369

3.067

3.659

Weighted-average common and potential dilutive shares outstanding

476.717

478.569

481.787

Earnings per share attributable to Zoetis Inc. stockholders—basic

$

4.29

$

3.44

$

3.14

Earnings per share attributable to Zoetis Inc. stockholders—diluted

$

4.27

$

3.42

$

3.11