U.S. SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP ( ) Check box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instructions 1(b). 1. Name and Address of Reporting Person LAMSON, STEPHEN B. 4637 Chabot Drive, Suite 200 Pleasanton, CA 94588 USA 2. Issuer Name and Ticker or Trading Symbol SIMPSON MANUFACTURING CO., INC. - (SSD) 3. IRS or Social Security Number of Reporting Person (Voluntary) 4. Statement for Month/Year SEPTEMBER 2000 5. If Amendment, Date of Original (Month/Year) 6. Relationship of Reporting Person to Issuer (Check all applicable) (X) Director ( ) 10% Owner (X) Officer (give title below) ( ) Other (specify below) PRESIDENT, SIMPSON STRONG-TIE COMPANY INC. 7. Individual or Joint/Group Filing (Check Applicable Line) [X] Form filed by One Reporting Person [ ] Form filed by More than One Reporting Person

Explanation of Responses: J The shares are owned by the Simpson Manufacturing Co., Inc. Profit Sharing Plan for Salaried Employees (the "Plan") of which the reporting person is a participant. The change in the number of shares held by the reporting person represents a rebalancing of his position. SIGNATURE OF REPORTING PERSON BY: Stephen B. Lamson /s/STEPHEN B. LAMSON ------------------------------------- DATE October 2, 2000 -------------------------------------

SIMPSON MANUFACTURING CO INC /CA/ 4