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Reminder: White Mountains Holds 2005 Annual Investor Information Meeting on May 26

HAMILTON, Bermuda, May 17 /PRNewswire-FirstCall/ -- White Mountains Insurance Group, Ltd. (NYSE: WTM) reminds its Investors that its annual Investor Information Meeting is scheduled for:

     Date:      Thursday, May 26, 2005
     Time:      10:00 a.m. (Eastern Time)
     Location:  The Waldorf=Astoria Hotel
                John Jacob Astor Salon
                301 Park Avenue
                New York, NY 10022

Investors and other interested parties can participate either in person or via webcast. Ray Barrette, President and CEO, and his senior partners will discuss White Mountains' operations and their outlook for the Company. Following a short presentation, Mr. Barrette and his partners will entertain questions from the audience.

For your convenience we have also posted this announcement and the webcast instructions on the company's web site at http://www.whitemountains.com. The Company's 2004 Annual Report on Form 10-K, Notice of 2005 Annual General Meeting of Members and Proxy Statement, and 2004 Management Report are also available on our web site. Please contact Dennis Beaulieu, our Corporate Secretary, at the Company's executive office at 80 South Main Street, Hanover, New Hampshire 03755 (Tel: 603-640-2200) for hard copies or further information.

ADDITIONAL INFORMATION

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

         White Mountains Insurance Group, Ltd. Hosts Investor Meeting

                         Date: Thursday, May 26, 2005
                             Time:  10:00 a.m. ET
                        Place: John Jacob Astor Salon
                  Waldorf=Astoria Hotel, New York City 10022

    To Attend Via Live Webcast:

Please follow these instructions to attend via live Webcast. We recommend connecting 10 minutes prior to the meeting.


     1.  Audio Instructions -- If you plan to listen by phone, please call
         this number to access the audio portion of the meeting before you
         logon to view the online portion.
         * U.S. callers dial toll free: 800.573.4842
         * If outside of the U.S., dial toll number: 617.224.4327
         * When the operator answers the call, give the Passcode 47965463

     2.  Online Instructions -- If you plan to view, or view and listen to,
         the live slide presentation via the Web:
         * Establish your Internet connection and launch your Internet browser
         * Type the following URL in the address section and press enter:
           http://www.whitemountains.com
         * Click on the "News and Events" link at the top of the home page;
           select "Events"
         * On the Events page, click on the hyperlink "Click Here for Webcast"
         * When prompted, enter the following:
            -- Your full name and email address
            -- Your company name
            -- Your title or position (optional)
         * Select your media option. Click on "Hear this presentation by
           telephone" to just view the slides online (and listen by phone), or
           Media Player or Real Player to access the full Webcast (live audio
           and slides).
         * You will now be connected to the online portion of the meeting

     3.  Replay Access: To view a recorded replay of the meeting
         * Establish your Internet connection and launch your Internet browser
         * Type the following URL in the address section and press enter:
           http://www.whitemoutains.com
         * Click on the "News and Events" link at the top of the home page;
           select "Events"
         * On the Events page, click on the hyperlink "Click Here for Webcast"
         * When prompted, enter the following:
            -- Your full name and email address
            -- Your company name
            -- Your title or position (optional)
            -- You will now be connected to the online portion of the meeting.


SOURCE  White Mountains Insurance Group, Ltd.
    -0-                             05/17/2005
    /CONTACT: David Foy, +1-203-453-1681, or Dennis Beaulieu, +1-603-640-2206,
both of White Mountains Insurance Group, Ltd./
    /Web site:  http://www.whitemountains.com/
    (WTM)

CO:  White Mountains Insurance Group, Ltd.
ST:  Bermuda, New York
IN:  INS FIN
SU:

DL-EO
-- NETU037 --
1666 05/17/2005 17:00 EDT http://www.prnewswire.com