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, ---------------------------- ---------------------------- 2000 1999 2000 1999 ------------ ------------ ------------ ------------ Weighted average number of common shares outstanding 12,048,205 11,968,123 12,037,015 11,777,481 ============ ============ ============ ============ Net income $ 11,465,164 $ 11,116,527 $ 32,065,110 $ 28,837,686 ============ ============ ============ ============ Basic net income per share $ 0.95 $ 0.93 $ 2.66 $ 2.45 ============ ============ ============ ============ SIMPSON MANUFACTURING CO., INC. AND SUBSIDIARIES COMPUTATION OF EARNINGS PER COMMON SHARE (UNAUDITED) EXHIBIT 11 ---------- DILUTED EARNINGS PER SHARE Three Months Ended Nine Months Ended September 30, September 30, ---------------------------- ---------------------------- 2000 1999 2000 1999 ------------ ------------ ------------ ------------ Weighted average number of common shares outstanding 12,048,205 11,968,123 12,037,015 11,777,481 Shares issuable pursuant to employee stock option plans, less shares assumed repurchased at the average fair value during the period 282,350 339,690 269,985 436,664 Shares issuable pursuant to the independent director stock option plan, less shares assumed repurchased at the average fair value during the period 4,641 4,096 4,193 3,905 ------------ ------------ ------------ ------------ Number of shares for computation of diluted net income per share 12,335,196 12,311,909 12,311,193 12,218,050 ============ ============ ============ ============ Net income $ 11,465,164 $ 11,116,527 $ 32,065,110 $ 28,837,686 ============ ============ ============ ============ Diluted net income per share $ 0.93 $ 0.90 $ 2.60 $ 2.36 ============ ============ ============ ============