Exhibit 21 SIGNIFICANT SUBSIDIARIES OF THE REGISTRANT ------------------------------------------ The Company has seven wholly-owned subsidiaries, each of which is included in the consolidated financial statements of the Company: (a) Blackhawk Collision Repair Inc., a Wisconsin corporation (b) Blackhawk Automotive Ltd., a British corporation (c) Blackhawk GmbH, a German corporation (d) Blackhawk Italia Srl, an Italian corporation (e) Blackhawk S.A., a French corporation (f) Blackhawk S.A., a Swiss corporation (g) HWC Export Sales Corporation, a Barbados corporation incorporated January 3, 1989, for the purpose of qualifying as a Foreign Sales Corporation (FSC) under applicable Internal Revenue Code provisions.