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,
		2002			2001			2002			2001
Weighted average number of common shares outstanding		24,500,445			24,267,744			24,445,550			24,181,202
Net income		$	16,715,142		$	12,116,915		$	41,336,683		$	33,715,721
Basic net income per share		$	0.68		$	0.50		$	1.69		$	1.39

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Diluted Earnings per Share

		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2002			2001			2002			2001
Weighted average number of common shares outstanding		24,500,445			24,267,744			24,445,550			24,181,202
Shares issuable pursuant to employee stock option plans, less shares assumed repurchased at the average fair value during the period		307,020			425,368			332,296			430,042
Shares issuable pursuant to the independent director stock option plan, less shares assumed repurchased at the average fair value during the period		3,970			6,342			4,295			7,050
Number of shares for computation of diluted net income per share		24,811,435			24,699,454			24,782,141			24,618,294
Net income		$	16,715,142		$	12,116,915		$	41,336,683		$	33,715,721
Diluted net income per share		$	0.67		$	0.49		$	1.67		$	1.37

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