X0201 5 2003-12-31 0 0 0 0000893160 VENTANA MEDICAL SYSTEMS INC VMSI 0001134540 GLEESON CHRISTOPHER M 1910 INNOVATION PARK DR TUCSON AZ 85737 0 1 0 0 President & CEO Common Stock 2000-03-06 5 G 0 L 100 0 D 12380 D Common Stock 2003-12-31 5 G 0 1000 0 D 15196 D Number of shares directly owned by Mr. Gleeson on December 31, 2000, 2001, 2002 was previously overstated by 98 shares. Includes 540 shares acquired in June 2003 and 540 shares acquired in December 2003 under Ventana's Employee Stock Purchase Plan. Price not applicable Nicholas Malden, Attorney-in-Fact for Christopher Gleeson 2004-02-13