Hamilton, Bermuda, May 15, 2002 – White Mountains Insurance Group, Ltd. ("White Mountains") today announced the postponement of its 2002 Annual Investor Meeting. The meeting was originally scheduled for May 23rd at the Waldorf Astoria Hotel in New York City.

HAMILTON, Bermuda, May 14, 2002 - White Mountains Insurance Group, Ltd. ended the first quarter of 2002 with a fully converted tangible book value per share of $222, a $4 decrease from December 31, 2001 including the $1 per share annual dividend paid in March 2002.

BOSTON (May 13, 2002– OneBeacon Insurance Group announced today that Drew Carnase has joined the company as Senior Vice President of Commercial Lines. He will report to John Cavoores, OneBeacon President and Chief Operating Officer. "Drew's charge is to achieve our Commercial Lines profit targets,"

BOSTON (May 7, 2002) – OneBeacon Insurance Group announced today that Carey Benson has been named President and CEO of its AutoOne Insurance subsidiary. Alvin Kaltman was appointed nonexecutive Chairman. Benson reports to John Cavoores, OneBeacon President and Chief Operating Officer.

BOSTON (March 29, 2002) - OneBeacon Insurance Group announced today that Chuck Chokel has joined the company as a Managing Director. He will report to Ray Barrette, OneBeacon Chairman and Chief Executive Officer, who explained that Chokel will be a "minister without portfolio or boundaries" for the

HAMILTON, Bermuda, March 1, 2002—The Board of Directors of White Mountains Insurance Group has elected Jack Byrne as its Chief Executive Officer. Until recently, Byrne had been serving as Chairman of the Boston-based OneBeacon Insurance Group. OneBeacon, which is a wholly-owned subsidiary of White

HAMILTON, Bermuda, March 1, 2002 – At its regular meeting held on February 28, 2002, the Board of Directors of White Mountains Insurance Group, Ltd. declared a $1.00 per share annual dividend, payable in cash on March 27, 2002, to holders of Common Stock of record as of the close of business on

HAMILTON, Bermuda, February 20, 2002 - White Mountains Insurance Group, Ltd. ended 2001 with a fully converted tangible book value per share of $226 (which includes net deferred credits), an increase of $38, or 21% (including dividends), from December 31, 2000.

BOSTON (December 19, 2001) – OneBeacon Insurance has announced new responsibilities for three senior managers and an addition to the management team. Larry Haefner, formerly Chief Actuary, is now Managing Director, Specialty Operations. Reporting to President and COO John Cavoores, Haefner is

Hamilton, Bermuda, December 14, 2001 – White Mountains Insurance Group, Ltd. (NYSE symbol: WTM) and the Benfield Group plc are pleased to announce the formation and commencement of operations of Montpelier Re Holdings Ltd., and its wholly owned subsidiary Montpelier Reinsurance Ltd., a Bermuda