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 JUNE 8, 2001 Date of Report (Date of earliest event reported) WHITE MOUNTAINS INSURANCE GROUP, LTD. (Exact name of registrant as specified in its charter) BERMUDA 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 7. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits. The following exhibits are filed herewith: EXHIBIT NO. DESCRIPTION 99 (a) Text of press release issued by White Mountains Insurance Group, Ltd., dated June 8, 2001. ITEM 9. REGULATION FD DISCLOSURE. White Mountains Insurance Group, Ltd. (the "Registrant") announced today changes in certain key management positions at its new principal subsidiary, OneBeacon Insurance Group. The Registrant's press release dated June 8, 2001 is attached herewith as Exhibit 99(a) and is incorporated by reference in its entirety. 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, LTD. Dated: June 8, 2001 By: /s/ ----------------------------------- J. Brian Palmer Chief Accounting Officer