Exhibit 11

Simpson Manufacturing Co., Inc. and Subsidiaries

Computation of Earnings Per Common Share

(Unaudited)

Basic Earnings per Share

		Three Months Ended June 30,						Six Months Ended June 30,
		2003			2002			2003			2002
Weighted average number of common shares outstanding		24,604,164			24,465,340			24,592,820			24,417,648
Net income		$	17,681,608		$	14,891,601		$	28,706,509		$	24,621,541
Basic net income per share		$	0.72		$	0.61		$	1.17		$	1.01

Diluted Earnings per Share

		Three Months Ended June 30,						Six Months Ended June 30,
		2003			2002			2003			2002
Weighted average number of common shares outstanding		24,604,164			24,465,340			24,592,820			24,417,648
Shares issuable pursuant to employee stock option plans, less shares assumed repurchased at the average fair value during the period		348,166			339,550			338,614			341,630
Shares issuable pursuant to the independent director stock option plan, less shares assumed repurchased at the average fair value during the period		5,082			4,490			4,904			4,404
Number of shares for computation of diluted net income per share		24,957,412			24,809,380			24,936,338			24,763,682
Net income		$	17,681,608		$	14,891,601		$	28,706,509		$	24,621,541
Diluted net income per share		$	0.71		$	0.60		$	1.15		$	0.99