X0202 4 2004-08-26 0 0001003113 MOLECULAR DEVICES CORP MDCC 0001231188 OLENIC THOMAS J 1311 ORLEANS DRIVE SUNNYVALE CA 94089 0 1 0 0 VP Sales and Service Common Stock 2004-07-30 5 J 0 58 17.35 A 644 D Common Stock 2004-08-26 4 M 0 1200 15.37 A 1844 D Common Stock 2004-08-26 4 S 0 1200 24.75 D 644 D Common Stock 2004-08-26 4 M 0 6300 15.85 A 6944 D Common Stock 2004-08-26 4 S 0 5300 24.75 D 1644 D Common Stock 2004-08-26 4 S 0 1000 24.77 D 644 D Employee Stock Option (Right to Buy) 15.37 2004-08-26 4 M 0 1200 0 D 1998-12-15 2007-12-15 Common Stock 1200 0 D Employee Stock Option (Right to Buy) 15.85 2004-08-26 4 M 0 6300 0 D 2004-02-10 2013-02-10 Common Stock 6300 16200 D Shares acquired pursuant to the Employee Stock Purchase Plan. Options vest as follows: 25% on each one year anniversary. Options vest as follows: 25% on first one year anniversary; 6.25% quarterly thereafter. /s/ O'Lenic, Thomas 2004-08-30