Earnings per Share

Basic earnings per share is calculated by dividing net income by the weighted average number of shares outstanding during the reported period. The calculation of diluted earnings per share is similar to basic earnings per share, except that the weighted average number of shares outstanding includes the dilution from potential shares resulting from stock options, restricted stock awards and other stock awards. The components of basic and diluted earnings per share are as follows:



	Three Months Ended June 30,					Six Months Ended June 30,
In millions, except per share amounts	2017			2016		2017			2016
Net loss attributable to common stockholders	$	(4	)	$	64	$	(6	)	$	18
Weighted average outstanding shares of common stock	127.9			129.8		129.2			129.6
Dilutive effect of employee stock options, restricted stock and other stock awards	—			1.7		—			1.6
Common stock and common stock equivalents	127.9			131.5		129.2			131.2
Loss per share:
Basic	$	(0.03	)	$	0.49	$	(0.05	)	$	0.14
Diluted	$	(0.03	)	$	0.49	$	(0.05	)	$	0.14

For the three and six months ended June 30, 2017, due to the net loss attributable to Teradata common stockholders, potential common shares that would cause dilution, such as employee stock options, restricted stock and other stock awards, have been excluded from the diluted share count because their effect would have been anti-dilutive. The fully diluted shares would have been 129.5 million and 130.7 million for the three and six months ended June 30, 2017.

Options to purchase 4.5 million shares of common stock for the three and six months ended June 30, 2017 and 5.1 million and 5.4 million shares of common stock for the three and six months ended June 30, 2016 were not included in the computation of diluted earnings per share because their exercise prices were greater than the average market price of the common shares for the period, and therefore would have been anti-dilutive.