EARNINGS PER COMMON SHARE:

3 Months Ended

Mar. 31, 2013

EARNINGS PER COMMON SHARE:

EARNINGS PER COMMON SHARE:

12.  EARNINGS PER COMMON SHARE:

Basic and diluted earnings per common share (“EPS”) were computed using the following common share data:

	Three months ended
	March 31,
($ in millions, except per share amounts; shares in thousands)	2013		2012
EPS Numerator:
Net income attributable to Rockwood Holdings, Inc. shareholders	$	18.9	$	75.8
EPS Denominator:
Basic weighted average number of common shares outstanding	78,530		77,384
Effect of dilutive stock options and other incentives	1,558		2,931
Diluted weighted average number of common shares outstanding and common stock equivalents	80,088		80,315
Basic earnings per common share attributable to Rockwood Holdings, Inc. shareholders:	$	0.24	$	0.98
Diluted earnings per common share attributable to Rockwood Holdings, Inc. shareholders:	$	0.24	$	0.94

For the three months ended March 31, 2013 and 2012, there were no outstanding shares that would have had an anti-dilutive effect.