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 12.



	For the Three Months Ended June 30				For the Six Months Ended June 30
(In thousands, except per share data)	2017		2016		2017		2016
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	78,960	$	69,893	$	150,464	$	135,267
Less preferred stock dividends	2,250		2,250		4,500		4,500
Net income available to common shareholders	$	76,710	$	67,643	145,964		130,767
Less income allocated to nonvested restricted stock	943		940		1,888		1,834
Net income allocated to common stock	$	75,767	$	66,703	$	144,076	$	128,933
Weighted average common shares outstanding	100,555		100,151		100,463		100,247
Basic income per common share	$	.75	$	.67	$	1.43	$	1.29
Diluted income per common share:
Net income available to common shareholders	$	76,710	$	67,643	$	145,964	$	130,767
Less income allocated to nonvested restricted stock	941		938		1,883		1,831
Net income allocated to common stock	$	75,769	$	66,705	$	144,081	$	128,936
Weighted average common shares outstanding	100,555		100,151		100,463		100,247
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	344		261		370		245
Weighted average diluted common shares outstanding	100,899		100,412		100,833		100,492
Diluted income per common share	$	.75	$	.66	$	1.43	$	1.28