================================================================================ As filed with the Securities and Exchange Commission on May 9, 2002 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- SCHEDULE TO-C Tender Offer Statement under Section 14(d)(1) or 13(e) Of the Securities Exchange Act of 1934 ---------- TRENWICK GROUP LTD. (Name of Subject Company -- Issuer) TRENWICK GROUP LTD. (Name of Filing Person -- Offeror) ---------- OPTIONS TO PURCHASE COMMON SHARES, PAR VALUE $.10 PER SHARE, ISSUED UNDER THE TRENWICK GROUP INC. 1989 STOCK PLAN, THE TRENWICK GROUP INC. 1993 STOCK OPTION PLAN, THE CHARTWELL RE CORPORATION 1993 STOCK OPTION PLAN, THE CHARTWELL RE CORPORATION 1997 OMNIBUS STOCK INCENTIVE PLAN AND THE LASALLE RE HOLDINGS LIMITED 1996 LONG-TERM INCENTIVE PLAN (Title of Class of Securities) ---------- JOHN V. DEL COL ASSISTANT SECRETARY TRENWICK GROUP LTD. CONTINENTAL BUILDING 25 CHURCH STREET HAMILTON HM 12, BERMUDA TELEPHONE: 441-292-3339 FACSIMILE: 441-292-2656 (Name, address and telephone number of person authorized to receive notices and communications on behalf of Filing Person) ---------- A COPY TO: JAMES R. CAMERON BAKER & MCKENZIE 805 THIRD AVE. NEW YORK, NEW YORK 10022 TELEPHONE: 212-891-3930 FACSIMILE: 212-891-3835 CALCULATION OF FILING FEE - ---------------------- --------------------- Transaction Valuation* Amount of Filing Fee* - ---------------------- --------------------- Not Applicable Not Applicable * No filing fee is required because this filing contains only preliminary communications made before the commencement of a tender offer. |_| Check box if any part of the fee is offset as provided by rule 0- 11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing. Amount previously paid: ___________ Filing Party: __________________ Form or Registration No. ___________ Date Filed: __________________ |X| Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer. Check the appropriate boxes below to designate any transactions to which the statement relates: |_| third-party tender offer subject to Rule 14d-1. |X| issuer tender offer subject to Rule 13e-4. |_| going-private transaction subject to Rule 13e-3. |_| amendment to Schedule 13D under Rule 13d-2. Check the following box if the filing is a final amendment reporting the results of the tender offer: |_| ITEM 12. Exhibits. EXHIBIT NUMBER DESCRIPTION - ------ ---------------------------------------------------------------------- 99.1 Definitive Proxy Statement for Annual General Meeting of Shareholders. SIGNATURE After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: May 9, 2002 TRENWICK GROUP LTD. By: /s/ John V. Del Col ----------------------------------- Name: John V. Del Col Title: Assistant Secretary INDEX TO EXHIBITS 99.1 Definitive Proxy Statement for Annual General Meeting of Shareholders.