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White Mountains Names Mark Byrne to the Board of Directors

HAMILTON, Bermuda, December 4, 2001 – The board of directors of White Mountains Insurance Group, Ltd., announced the election of Mark J. Byrne to the board of directors.

Mark Byrne manages West End Capital Management Limited, a Bermuda investment management firm engaged primarily in fixed income arbitrage. West End manages over $7 billion in assets. Byrne, the son of White Mountains chairman Jack Byrne, is also Chairman and CEO of Gen Re Securities, a dealer in the global securities and derivatives markets. Gen Re Securities is wholly owned by General Re Corporation, a subsidiary of Berkshire Hathaway Inc.

Prior to founding West End, Mark Byrne held a variety of trading and management positions at Salomon Brothers, PIMCO, Lehman Brothers and, most recently, Credit Suisse First Boston, where he was Managing Director and global head of fixed income arbitrage.

Mark Byrne is a graduate of Dartmouth College and The Amos Tuck School of Business. After business assignments in the USA, Japan, England, France and Bermuda, Mark and his family now live in Bermuda.

White Mountains is a Bermuda-based insurance holding company traded on the New York Stock Exchange under the symbol WTM.

Corporate Headquarters:
White Mountains Insurance Group, Ltd.
12 Church Street, Suite 322
Hamilton, HM 11 Bermuda
Ph: 441-296-6011 g Fax: 441-296-9904

Executive Offices:
White Mountains Insurance Group, Ltd.
28 Gates St., White River Junction, VT 05001
Ph: 802-295-4500 g Fax: 802-295-4550
www.whitemountains.com

CONTACT:
Dennis Beaulieu
(802) 295-4510