Sec Form 4 Filing - LUSARDI ROBERT R @ WHITE MOUNTAINS INSURANCE GROUP LTD - 2009-03-25

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 LUSARDI ROBERT R 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) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP - White Mountains Capital (Last) (First) (Middle) C/O WHITE MOUNTAINS INSURANCE GROUP, LTD, 80 SOUTH MAIN STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/25/2009 (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 31 ( 1 ) I 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 ( 2 ) 03/25/2009 A 3 ( 3 ) ( 4 ) ( 4 ) Common Shares 3 $ 181.66 ( 5 ) 507 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other LUSARDI ROBERT R C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET HANOVER, NH03755 EVP - White Mountains Capital Signatures Jason R. Lichtenstein, by Power of Attorney 03/26/2009 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Since June 27, 2008, the date of Reporting Person's last filing, Reporting Person acquired 26 shares of WTM Common Shares in his 401(k) account. 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 March 9, 2009. ( 2 )Phantom Shares are convertible into Common Shares on a 1 for 1 basis. ( 3 )On March 25, 2009, the Reporting Person's deferred compensation account was credited with Phantom Shares equal in value to the ordinary dividend paid on the underlying WTM Common Shares on the dividend date. ( 4 )The Phantom Shares are held in the Reporting Person's WTM deferred compensation account and are payable in cash or shares upon the earlier of the date when the Reporting Person ceases to be an employee of the Company or a date certain selected by the Reporting Person. ( 5 )Dividends were automatically invested in Phantom Shares at the fair market price per share of the underlying WTM Common Shares on March 25, 2009, the date dividends were actually paid.

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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