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 June 30				For the Six Months Ended June 30
(In thousands, except per share data)	2012		2011		2012		2011
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	70,733	$	69,034	$	136,532	$	129,487
Less income allocated to nonvested restricted stockholders	666		501		1,228		905
Net income available to common stockholders	$	70,067	$	68,533	$	135,304	$	128,582
Weighted average common shares outstanding	87,404		90,866		87,812		90,829
Basic income per common share	$	.80	$	.76	$	1.54	$	1.42
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	70,733	$	69,034	$	136,532	$	129,487
Less income allocated to nonvested restricted stockholders	665		499		1,226		902
Net income available to common stockholders	$	70,068	$	68,535	$	135,306	$	128,585
Weighted average common shares outstanding	87,404		90,866		87,812		90,829
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	268		408		302		397
Weighted average diluted common shares outstanding	87,672		91,274		88,114		91,226
Diluted income per common share	$	.80	$	.75	$	1.54	$	1.41