<TABLE>
<CAPTION>
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
------------ ------------ ------------ ------------
<S> <C> <C> <C> <C>
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
============ ============ ============ ============
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
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
------------ ------------ ------------ ------------
<S> <C> <C> <C> <C>
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
============ ============ ============ ============
</TABLE>