X0202 4 2004-08-31 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 2004-08-31 4 M 0 1095 17.06 A 1739 D Common Stock 2004-08-31 4 M 0 2137 15.85 A 3876 D Common Stock 2004-08-31 4 M 0 17736 20.20 A 21612 D Common Stock 2004-08-31 4 S 0 1095 23.10 D 20517 D Common Stock 2004-08-31 4 S 0 2137 23.10 D 18380 D Common Stock 2004-08-31 4 S 0 5700 23.07 D 12680 D Common Stock 2004-08-31 4 S 0 800 23.08 D 11880 D Common Stock 2004-08-31 4 S 0 600 23.05 D 11280 D Common Stock 2004-08-31 4 S 0 1200 23.04 D 10080 D Common Stock 2004-08-31 4 S 0 100 23.02 D 9980 D Common Stock 2004-08-31 4 S 0 9136 23.00 D 844 D Common Stock 2004-08-31 4 S 0 200 23.01 D 644 D Employee Stock Option (Right to Buy) 17.06 2004-08-31 4 M 0 1095 0 D 1998-07-29 2008-07-29 Common Stock 1095 305 D Employee Stock Option (Right to Buy) 20.20 2004-08-31 4 M 0 17736 0 D 2003-01-31 2012-01-30 Common Stock 17736 22264 D Employee Stock Option (Right to Buy) 15.85 2004-08-31 4 M 0 2137 0 D 2004-02-10 2013-02-10 Common Stock 2137 14063 D Options vest as follow: 20% vest on first grant anniversary date and 5% vest quarterly thereafter until fully vested. Options vest as follows: 25% on first one year anniversary; 6.25% quarterly thereafter. /s/ O'Lenic, Thomas 2004-09-01