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 11.



	For the Three Months Ended September 30				For the Nine Months Ended September 30
(In thousands, except per share data)	2012		2011		2012		2011
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	66,006	$	65,352	$	202,538	$	194,839
Less income allocated to nonvested restricted stockholders	626		486		1,854		1,391
Net income available to common stockholders	$	65,380	$	64,866	$	200,684	$	193,448
Weighted average common shares outstanding	86,894		89,477		87,504		90,373
Basic income per common share	$	.75	$	.72	$	2.29	$	2.14
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	66,006	$	65,352	$	202,538	$	194,839
Less income allocated to nonvested restricted stockholders	623		486		1,849		1,388
Net income available to common stockholders	$	65,383	$	64,866	$	200,689	$	193,451
Weighted average common shares outstanding	86,894		89,477		87,504		90,373
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	298		260		300		351
Weighted average diluted common shares outstanding	87,192		89,737		87,804		90,724
Diluted income per common share	$	.75	$	.72	$	2.29	$	2.13