Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Computation Of Basic And Diluted Income Per Common Share From Continuing Operations

The following table sets forth the computation of basic and dilutive income per common share from continuing operations attributable to OM Group, Inc. common stockholders for the three months ended March 31:



	2012		2011
(in thousands, except per share amounts)
Income from continuing operations attributable to
OM Group, Inc. common stockholders	$	12,085	$	30,892

Weighted average shares outstanding — basic	31,874		30,526
Dilutive effect of stock options and restricted stock	158		169
Weighted average shares outstanding — assuming dilution	32,032		30,695
Earnings per common share:
Income from continuing operations attributable to
OM Group, Inc. common stockholders — basic	$	0.38	$	1.01
Income from continuing operations attributable to
OM Group, Inc. common stockholders — assuming dilution	$	0.38	$	1.01

Computation Of Basic And Diluted Net Income Per Common Share

The following table sets forth the computation of basic and diluted net income per common share attributable to OM Group, Inc. common stockholders for the three months ended March 31:



	2012		2011
(in thousands, except per share amounts)
Net income attributable to OM Group, Inc. common stockholders	$	11,949	$	30,652

Weighted average shares outstanding — basic	31,874		30,526
Dilutive effect of stock options and restricted stock	158		169
Weighted average shares outstanding — assuming dilution	32,032		30,695
Earnings per common share:
Net income attributable to OM Group, Inc. common stockholders — basic	$	0.37	$	1.00
Net income attributable to OM Group, Inc. common stockholders — assuming dilution	$	0.37	$	1.00