UNITED STATES

                       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


                                NOVEMBER 21, 2002
                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.)


              28 GATES STREET, WHITE RIVER JUNCTION, VERMONT 05001
                    (Address of principal executive offices)


                                 (802) 295-4500
              (Registrant's telephone number, including area code)





ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

         (c) Exhibits. The following exhibits are furnished herewith:

EXHIBIT NO. DESCRIPTION ----------- ----------- 99 (a) Text of press release issued by White Mountains Insurance Group, Ltd. dated November 21, 2002.
ITEM 9. REGULATION FD DISCLOSURE. In a press release dated November 21, 2002, White Mountains Insurance Group, Ltd. (the "Registrant") announced certain changes in its senior management, including the election of Ray Barrette as its President and Chief Executive Officer. The Registrant's press release dated November 21, 2002 is furnished 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: November 25, 2002 By: /s/ J. BRIAN PALMER ------------------------------ J. Brian Palmer Chief Accounting Officer


                                                              Exhibit 99(a)(1)

[WHITE MOUNTAINS LOGO]

                                                      PRESS RELEASE
                                                      CONTACT: Dennis Beaulieu
                                                             Tel: 802-295-4510


                           WHITE MOUNTAINS ANNOUNCES
                 ELECTION OF RAY BARRETTE AS PRESIDENT AND CEO


HAMILTON, Bermuda, November 21, 2002 -- White Mountains Insurance Group, Ltd.
(NYSE: WTM) announced today that Ray Barrette has been named President and
Chief Executive Officer of White Mountains effective January 1, 2003.
Barrette joined the Company as CFO in 1997 and was promoted to President in
1999. On June 1, 2001, Barrette resigned as President to take over day-to-day
control of the Company's OneBeacon operations. He is currently the Chairman
and Chief Executive Officer of OneBeacon Insurance Group.

Jack Byrne, the Company's Chairman and current CEO, said, "Ray was the
driving force behind White Mountains' move to Bermuda and the turn-around at
OneBeacon, where his performance has been nothing short of spectacular. Ray
is passionate about the business and understands that financial and
underwriting discipline come first. I am confident our owners will prosper
under his leadership."

John Gillespie, a director since 1999, has been elected a Deputy Chairman of
the Board. Gillespie currently serves as Managing Director -- Capital and
Investments at OneBeacon and is responsible for managing OneBeacon's $10
billion portfolio of invested assets and capital. Byrne said, "John has done
an outstanding job with our investments. Not only has he dodged all the
bullets on the investment side, White Mountains has enjoyed positive returns
at a time when many have faltered."

Barrette added, "John has added tremendous value to the Company in the last
few years. The performance of our investment portfolio is critical to White
Mountains' success and I can't think of a better partner to get the job done."

Byrne will remain Chairman of the Board of Directors, a position he has held
since 1985 and, by the Board's leave, intends to hold until at least 2005. In
announcing his retirement as Chief Executive Officer, Byrne said, "For the
last two years, Ray, John and I have worked together overseeing White
Mountains' insurance operations. Ray and John have performed in an exemplary
fashion and results in our insurance operations and in the management of our
assets have been splendid."

- -------------------------------------------------------------------------------
CORPORATE HEADQUARTERS                    EXECUTIVE OFFICES
- ----------------------                    -----------------
White Mountains Insurance Group, Ltd.     White Mountains Insurance Group, Ltd.
12 Church Street, Suite 322               28 Gates Street
Hamilton, HM 11 Bermuda                   White River Jct., VT 05001
Ph: 441-296-6011                          Ph: 802-295-4500
Fax: 441-296-9904                         Fax: 802-295-4550
                                          www.whitemountains.com



Byrne went on to say, "These are exciting times for your Chairman. We have a
strong balance sheet, our insurance and reinsurance operations have been
improving steadily and we are well-positioned to take advantage of
opportunities that may emerge. I am stepping back from day-to-day management
but I intend to remain active, fully engaged and fully invested in what I
believe should be a bright future for our owners."

Tom Kemp, Byrne's long-time associate, is also retiring effective January 1,
2003 from his position as White Mountains' President. Kemp, a director since
1994, will remain on the Board and will continue to serve the Company in an
advisory capacity. Byrne said, "Tom has been by my side for much of the last
26 years. His steady hand has added great value to our enterprise."


                            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.




Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995

     This press release may contain "forward-looking statements" within the
meaning of Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Act of 1934. All statements, other than statements of historical
facts, included or referenced in this release which address activities,
events or developments which we expect or anticipate will or may occur in the
future are forward-looking statements. The words "believe," "intend,"
"expect," "anticipate," "project," "estimate," "predict" and similar
expressions are also intended to identify forward-looking statements. These
forward-looking statements include, among others, statements with respect to
White Mountains':

     o   growth in book value per share or return on equity;

     o   business strategy;

     o   financial and operating targets or plans;

     o   incurred losses and the adequacy of its loss and loss adjustment
         expense reserves;

     o   projections of revenues, income (or loss), earnings (or loss) per
         share, dividends, market share or other financial forecasts;

     o   expansion and growth of its business and operations; and

     o   future capital expenditures.

     These statements are based on certain assumptions and analyses made by
White Mountains in light of its experience and perception of historical
trends, current conditions and expected future developments, as well as other
factors believed to be appropriate in the circumstances. However, whether
actual results and developments will conform with its expectations and
predictions is subject to a number of risks and uncertainties that could
cause actual results to differ materially from expectations, including:

     o   the continued availability of capital and financing;

     o   general economic, market or business conditions;

     o   business opportunities (of lack thereof) that may be presented to it
         and pursued;

     o   competitive forces, including the conduct of other property and
         casualty insurers and reinsurers;

     o   changes in domestic or foreign laws or regulations applicable to
         White Mountains, its competitors or its clients;

     o   an economic downturn or other economic conditions adversely affecting
         its financial position;

     o   loss reserves established subsequently proving to have been
         inadequate; and

     o   other factors, most of which are beyond White Mountains' control.

     Consequently, all of the forward-looking statements made in this press
release are qualified by these cautionary statements, and there can be no
assurance that the actual results or developments anticipated by White
Mountains will be realized or, even if substantially realized, that they will
have the expected consequences to, or effects on, White Mountains or its
business or operations. White Mountains assumes no obligation to update
publicly any such forward-looking statements, whether as a result of new
information, future events or otherwise.