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


                                DECEMBER 30, 1999
                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.)


               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 December 30, 1999 Folksamerica Holding Company, Inc., a wholly owned
subsidiary of the Registrant, announced that it had signed a definitive
agreement to purchase PCA Property & Casualty Insurance Company, a Florida
domiciled Workers' Compensation Insurance Company, from Humana Inc. The
transaction, for $125 million in cash, is subject to regulatory
approvals.



ITEM 7.         FINANCIAL STATEMENTS AND EXHIBITS.

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

     Exhibit No.  Description
     -----------  -----------

     10(a)        Stock Purchase Agreement as of December 30, 1999, by and
                  among Humana Inc., Physician Corporation of America, and
                  Folksamerica Holding Company, Inc.

     10(b)        Amended and Restated Management Contract by and between PCA
                  Property & Casualty Insurance Company and Humana Workers
                  Compensation Services, Inc.



                                   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: January 10, 2000                  By:  /s/
                                             -----------------------------------
                                             Michael S. Paquette
                                             Senior Vice President and
                                             Controller