Earnings Per Share

9 Months Ended

Sep. 30, 2016

Basic earnings per share is computed by dividing net income attributable to the company by the weighted average number of shares of all classes of CME Group common stock outstanding for each reporting period. Diluted earnings per share reflects the increase in shares using the treasury stock method to reflect the impact of an equivalent number of shares of common stock if stock options were exercised and restricted stock awards were converted into common stock. Anti-dilutive stock options, restricted stock and performance share awards were as follows for the periods presented:



	Quarter Ended September 30,		Nine Months Ended September 30,
(in thousands)	2016	2015	2016	2015
Stock options	311	432	315	432
Restricted stock and performance shares	530	—	530	538
Total	841	432	845	970

The following table presents the earnings per share calculation for the periods presented:



	Quarter Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Net Income (in millions)	$	472.8	$	359.9	$	1,160.7	$	955.3
Weighted Average Number of Common Shares (in thousands):
Basic	337,592		336,323		337,299		336,015
Effect of stock options, restricted stock and performance shares	1,551		1,816		1,535		1,789
Diluted	339,143		338,139		338,834		337,804
Earnings per Common Share:
Basic	$	1.40	$	1.07	$	3.44	$	2.84
Diluted	1.39		1.06		3.43		2.83