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