X0202 4 2004-12-15 0 0000811612 COMMERCE GROUP INC /MA CGI 0001237533 DIGNAN PETER J 36 BOUNDARY STONE ROAD SUTTON MA 01590 0 1 0 0 Senior Vice President Common stock 2004-12-15 4 M 0 3071 30.8 A 3071 D Common stock 2004-12-15 4 S 0 3071 60.5 D 0 D Common stock 35483 I See Option to purchase common stock 30.8 2004-12-15 4 M 0 3071 0 D 2004-04-06 2009-04-07 Common stock 3071 24586 D The transactions reported on this Form 4 were made pursuant to a plan intended to comply with Rule 10b5-1(c), previously adopted on September 15, 2004, when the reporting person was not in possession of material nonpublic information. The reporting person indirectly beneficially owns 35,483 shares that are held by the Employee Stock Ownership Plan of The Commerce Group, Inc., which number of shares is calculated based on the units that have been credited to the reporting person as a participant in the ESOP and is subject to adjustment from time to time due, in part, to the unit value and the price per share of the Common Stock. /s/ Peter J. Dignan 2004-12-16