Net Income Per Share Attributable to Gilead Common Shareholders

12 Months Ended

Dec. 31, 2019

NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS

Basic net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding during the period. Diluted net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock and other dilutive securities outstanding during the period. The potentially dilutive shares of our common stock resulting from the assumed exercise of outstanding stock options and equivalents were determined under the treasury stock method.

Potential shares of common stock excluded from the computation of diluted net income per share attributable to Gilead common shareholders because their effect would have been antidilutive were 14 million, 13 million and 11 million during 2019, 2018 and 2017, respectively.

The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders (in millions, except per share amounts):



	Year Ended December 31,
	2019		2018		2017
Net income attributable to Gilead	$	5,386	$	5,455	$	4,628
Shares used in per share calculation - basic	1,270		1,298		1,307
Dilutive effect of stock options and equivalents	7		10		12
Shares used in per share calculation - diluted	1,277		1,308		1,319
Net income per share attributable to Gilead common stockholders - basic	$	4.24	$	4.20	$	3.54
Net income per share attributable to Gilead common stockholders - diluted	$	4.22	$	4.17	$	3.51