SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ------------- FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 OCTOBER 15, 1999 Date of Report (Date of earliest event reported) WHITE MOUNTAINS INSURANCE GROUP, INC. (Exact name of registrant as specified in its charter) DELAWARE 1-8993 94-2708455 (State or other jurisdiction of (Commission (I.R.S. Employer incorporation or organization) file number) Identification No.) 80 SOUTH MAIN STREET, HANOVER, NEW HAMPSHIRE 03755 (Address of principal executive offices) (603) 643-1567 (Registrant's telephone number, including area code)

ITEM 5. OTHER EVENTS. On October 15, 1999, White Mountains Insurance Group, Inc. concluded its previously announced acquisition of Consolidated International Group, Inc., a Delaware based insurance holding company for $86.7 million in cash. Consolidated's principal operating subsidiaries are Peninsula Insurance Company, American Centennial Insurance Company, and British Insurance Company of Cayman. Peninsula Insurance Company, located in Salisbury, Maryland, writes small commercial and personal lines through independent agents in the mid-Atlantic. American Centennial Insurance Company and British Insurance Company of Cayman are in runoff. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits. The following exhibits are filed herewith: Exhibit No. Description ----------- ----------- 10 (a) Stock Purchase Agreement by and among White Mountains Insurance Group, Inc., Consolidated International Group, Inc. and The Sellers Named Therein* * previously filed in connection with Form 8-K dated June 1, 1999

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. WHITE MOUNTAINS INSURANCE GROUP, INC. Dated: October 18, 1999 By: /s/ Michael S. Paquette --------------------------------------- Michael S. Paquette Senior Vice President and Controller