Earnings Per Share

9 Months Ended

Sep. 30, 2015

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)	2015	2014	2015	2014
Stock options	432	1,461	432	1,463
Restricted stock and performance shares	—	700	538	700
Total	432	2,161	970	2,163

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



	Quarter Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Net Income Attributable to CME Group (in millions)	$	359.9	$	290.0	$	955.3	$	820.6
Weighted Average Number of Common Shares (in thousands):
Basic	336,323		334,424		336,015		334,144
Effect of stock options, restricted stock and performance shares	1,816		1,748		1,789		1,676
Diluted	338,139		336,172		337,804		335,820
Earnings per Common Share Attributable to CME Group:
Basic	$	1.07	$	0.87	$	2.84	$	2.46
Diluted	1.06		0.86		2.83		2.44