Simpson Manufacturing Co., Inc. and Subsidiaries
Computation of Earnings Per Common Share
(Unaudited)

Exhibit 11

Basic Earnings per Share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2001		2000		2001		2000
Weighted average number of common shares outstanding		12,133,872		12,048,205		12,090,601		12,037,015
Net income	$	12,116,915	$	11,671,732	$	33,715,721	$	32,407,458
Basic net income per share	$	1.00	$	0.97	$	2.79	$	2.69

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Simpson Manufacturing Co., Inc. and Subsidiaries
Computation of Earnings Per Common Share
(Unaudited)

Exhibit 11 (continued)

Diluted Earnings per Share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2001		2000		2001		2000
Weighted average number of common shares outstanding		12,133,872		12,048,205		12,090,601		12,037,015
Shares issuable pursuant to employee stock option plans, less shares assumed repurchased at the average fair value during the period		212,684		282,350		215,021		269,985
Shares issuable pursuant to the independent director stock option plan, less shares assumed repurchased at the average fair value during the period		3,171		4,641		3,525		4,193
Number of shares for computation of diluted net income per share		12,349,727		12,335,196		12,309,147		12,311,193
Net income	$	12,116,915	$	11,671,732	$	33,715,721	$	32,407,458
Diluted net income per share	$	0.98	$	0.95	$	2.74	$	2.63

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