Earnings Per Share

Earnings per share of common stock outstanding were computed as follows:



	Three Months Ended September 30, 2017		Three Months Ended September 30, 2016		Nine Months Ended September 30, 2017		Nine Months Ended September 30, 2016
	(Millions Except Share and Per Share Amounts)
Basic earnings per share —
Net income attributable to Tenneco Inc.	$	83	$	179	$	139	$	318
Weighted Average shares of common stock outstanding	52,508,078		55,679,969		53,265,149		56,511,838
Earnings per share of common stock	$	1.57	$	3.22	$	2.61	$	5.63
Diluted earnings per share —
Net income attributable to Tenneco Inc.	$	83	$	179	$	139	$	318
Weighted Average shares of common stock outstanding	52,508,078		55,679,969		53,265,149		56,511,838
Effect of dilutive securities:
Restricted stock	89,666		207,707		106,320		144,145
Stock options	89,912		278,033		130,395		302,464
Weighted Average shares of common stock outstanding including dilutive securities	52,687,656		56,165,709		53,501,864		56,958,447
Earnings per share of common stock	$	1.57	$	3.19	$	2.60	$	5.58

Options to purchase 834 and 171,580 shares of common stock were outstanding as of September 30, 2017 and 2016, respectively, but not included in the computation of diluted earnings per share respectively, because the options were anti-dilutive.