Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that contain nonforfeitable rights to dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the table below. Nonvested share-based awards are further discussed in Note 13.



	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands, except per share data)	2013		2012		2013		2012
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	68,224	$	66,006	$	195,046	$	202,538
Less income allocated to nonvested restricted stock	808		626		2,152		1,854
Net income allocated to common stock	$	67,416	$	65,380	$	192,894	$	200,684
Weighted average common shares outstanding	90,003		91,239		89,999		91,879
Basic income per common share	$	.75	$	.71	$	2.14	$	2.18
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	68,224	$	66,006	$	195,046	$	202,538
Less income allocated to nonvested restricted stock	806		623		2,146		1,849
Net income allocated to common stock	$	67,418	$	65,383	$	192,900	$	200,689
Weighted average common shares outstanding	90,003		91,239		89,999		91,879
Net effect of the assumed exercise of stock-based awards - based on
the treasury stock method using the average market price for the respective periods	449		313		353		316
Weighted average diluted common shares outstanding	90,452		91,552		90,352		92,195
Diluted income per common share	$	.75	$	.72	$	2.14	$	2.18