8-K

                       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


                                OCTOBER 20, 2000
                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 organizatio  n)      file number)          Identification No.)


               80 SOUTH MAIN STREET, HANOVER, NEW HAMPSHIRE 03755
                    (Address of principal executive offices)


                                 (603) 643-1567
              (Registrant's telephone number, including area code)





ITEM 5.         OTHER EVENTS.


On October 20, 2000, White Mountains Insurance Group, Ltd. announced that it had
received a favorable tax ruling from the Internal Revenue Service regarding
issues related to its 1991 sale of Fireman's Fund Insurance Company to Allianz
of America, Inc.

The Registrant's press release dated October 20, 2000 announcing this
information is attached herewith as Exhibit 99(a) and is incorporated by
reference in its entirety.




ITEM 7.         FINANCIAL STATEMENTS AND EXHIBITS.

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

     EXHIBIT NO.               DESCRIPTION

99 (a)                         Text of press release issued by White Mountains
                               Insurance Group, Ltd., dated October 20, 2000.





                                   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: October 20, 2000        By:  /s/___________________________
                                    Michael S. Paquette
                                    Senior Vice President and
                                    Controller

EX-99.(A)

                                                                   EXHIBIT 99(a)


                                     PRESS
                                     RELEASE

                                     CONTACT: Mike Paquette
                                     (603) 640-2205


                       WHITE MOUNTAINS RECEIVES FAVORABLE
                     TAX RULING REGARDING SALE OF SUBSIDIARY

HAMILTON, Bermuda, October 20, 2000 - White Mountains announced today that it
has received a favorable tax ruling from the Internal Revenue Service regarding
issues related to its 1991 sale of Fireman's Fund Insurance Company to Allianz
of America, Inc.

Since that sale, the Company has carried a reserve with respect to those
issues. In September 2000, the Company was informed that the Internal Revenue
Service would agree with the position taken by White Mountains. On October
19, 2000, the Company received the Technical Advice Memorandum from the
Internal Revenue Service's National Office confirming this conclusion. As a
result, the Company will release a $95 million reserve in its 2000 third
quarter financial statements.

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
the "safe harbor" provisions of the United States Private Securities Litigation
Reform Act of 1995. White Mountains cautions that a number of important factors
could cause actual results to differ materially from the plans, objectives,
expectations, estimates and intentions expressed in forward-looking statements
made by White Mountains. These factors include: (i) competitive forces,
including the conduct of other property and casualty insurers and reinsurers,
(ii) changes in domestic or foreign laws or regulations applicable to White
Mountains, its competitors or its clients, (iii) an economic downturn or other
economic conditions (such as a rising interest rate environment) adversely
affecting White Mountains' financial position, and (iv) loss reserves
established by White Mountains subsequently proving to have been inadequate.


- --------------------------------------------------------------------------------
                                         
CORPORATE HEADQUARTERS:                     EXECUTIVE OFFICES:
White Mountains Insurance Group, Ltd.       White Mountains Insurance Group, Ltd.
12 Church Street, Suite 322                 80 South Main Street, Hanover,  NH   03755
Hamilton,  HM 11   Bermuda                  Ph:  603-643-1567   *   Fax:  603-643-4562







White Mountains cautions that the foregoing list of important factors is not
exhaustive. In any event, such forward-looking statements made by White
Mountains speak only as of the date on which they are made, and White Mountains
does not undertake any obligation to update or revise such statements as a
result of new information, future events or otherwise.
















- --------------------------------------------------------------------------------
                                         
CORPORATE HEADQUARTERS:                     EXECUTIVE OFFICES:
White Mountains Insurance Group, Ltd.       White Mountains Insurance Group, Ltd.
12 Church Street, Suite 322                 80 South Main Street, Hanover,  NH   03755
Hamilton,  HM 11   Bermuda                  Ph:  603-643-1567   *   Fax:  603-643-4562