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. 4120 Dublin Blvd., Suite 400 Dublin, CA 94568 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 FEBRUARY 2001 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: SIGNATURE OF REPORTING PERSON BY: Stephen B. Lamson /s/STEPHEN B. LAMSON ------------------------------------- DATE February 28, 2001 -------------------------------------

SIMPSON MANUFACTURING CO INC /CA/ 4