0000920371-99-000009 4 1 19990430 19990505 SIMPSON MANUFACTURING CO INC /CA/ 0000920371 3420 943196943 CA 1231 4 34 001-13429 99610922 4637 CHABOT DR STE 200 PLEASANTON CA 94588 5106099912 4637 CHABOT DR STE 200 PLEASANTON CA 94588 LAMSON STEPHEN B 0001035241 OFFICER 4 4637 CHABOT DRIVE SUITE 200 PLESANTON CA 94588 4637 CHABOT DRIVE SUITE 200 PLEASENTON CA 94588 4 1 000092037199000009-001-seq1-4.txt FORM 4 - APRIL 1999