Sec Form 4 Filing - FASS STEVE ELLIOTT @ WHITE MOUNTAINS INSURANCE GROUP LTD - 2007-02-27

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person FASS STEVE ELLIOTT 2. Issuer Name and Ticker or Trading Symbol WHITE MOUNTAINS INSURANCE GROUP LTD [ WTM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 80 SOUTH MAIN STREET 3. Date of Earliest Transaction (MM/DD/YY) 02/27/2007 (Street) HANOVER, NH03755 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Shares 02/25/2007 F 4,465 D $ 574.9 5,535 D Common Shares 4,043 ( 1 ) I By 401(k)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Phantom Shares (Deferred Compensation) ( 2 ) ( 3 ) ( 3 ) Common Shares 0 14,394 D Phantom Shares (Deferred Compensation) ( 2 ) ( 4 ) ( 4 ) Common Shares 0 4,175 D Common Share Options ( 5 ) ( 6 ) 02/28/2010 Common Shares 0 9,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other FASS STEVE ELLIOTT C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET HANOVER, NH03755 X Signatures Dennis Beaulieu, by Power of Attorney 02/27/2007 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Since December 27, 2006, the date of Reporting Person's last filing, Reporting Person acquired 4 shares of WTM Common Shares under the Folksamerica 401(k) Plan. WTM Common Shares are purchased at fair market value on the date of purchase. The information in this report is based on a plan statement dated as of January 31, 2007. ( 2 )Phantom Shares are convertible into Common Shares on a 1 for 1 basis. ( 3 )The Phantom Shares are payable, at the election of the Company, in cash or in Common Shares, following termination of the Reporting Person's employment with the Company or beginning at an earlier date selected by the Reporting Person in accordance with the terms of the deferred compensation plan. ( 4 )The Phantom Shares are payable in cash following termination of the Reporting Person's employment with the Company. ( 5 )On February 28, 2000, the Reporting Person was granted options to purchase WTM Common Shares on a 1 for 1 basis at an initial exercise price of $106.19. The exercise price increases by 6% annually on a cumulative basis. ( 6 )Reporting Person was originally granted 9,000 options to purchase Common Shares on February 28, 2000. 900 Options become exercisable annually over a ten-year period.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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