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 September 30				For the Nine Months Ended September 30
(In thousands, except per share data)	2017		2016		2017		2016
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	74,564	$	68,545	$	225,028	$	203,812
Less preferred stock dividends	2,250		2,250		6,750		6,750
Net income available to common shareholders	$	72,314	$	66,295	218,278		197,062
Less income allocated to nonvested restricted stock	862		913		2,750		2,747
Net income allocated to common stock	$	71,452	$	65,382	$	215,528	$	194,315
Weighted average common shares outstanding	100,598		100,198		100,509		100,231
Basic income per common share	$	.71	$	.65	$	2.14	$	1.94
Diluted income per common share:
Net income available to common shareholders	$	72,314	$	66,295	$	218,278	$	197,062
Less income allocated to nonvested restricted stock	860		912		2,743		2,743
Net income allocated to common stock	$	71,454	$	65,383	$	215,535	$	194,319
Weighted average common shares outstanding	100,598		100,198		100,509		100,231
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	336		255		358		248
Weighted average diluted common shares outstanding	100,934		100,453		100,867		100,479
Diluted income per common share	$	.71	$	.65	$	2.14	$	1.93