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White Mountains Announces the Relocation of its Principal Executive Office

January 8, 2003 at 4:21 PM EST

HAMILTON, Bermuda, Jan. 8 /PRNewswire-FirstCall/-- White Mountains Insurance Group, Ltd. (NYSE: WTM) announced today that, effective January 1, 2003, its principal executive office was relocated to:

80 South Main Street
Hanover, NH 03755
Tel: 603-640-2200
Fax: 603-643-4592

A satellite office will remain at:

28 Gates Street
White River Junction, VT 05001
Tel: 802-295-4500
Fax: 802-295-4550

White Mountains' corporate headquarters remains unaffected by this change:

Crawford House
23 Church Street
Hamilton HM 11
Bermuda
Tel: 441-296-6011
Fax: 441-296-9904

ADDITIONAL INFORMATION

White Mountains is a Bermuda-domiciled financial services holding company traded on the New York Stock Exchange under the symbol WTM. Additional financial information and other items of interest are available at the Company's web site located at www.whitemountains.com.

CONTACT:
Dennis Beaulieu
Tel: 802-295-4510

SOURCE White Mountains Insurance Group, Ltd.

-0- 01/08/2003

/CONTACT: Dennis Beaulieu of White Mountains Insurance Group, Ltd., +1-802-295-4510 /