Ownership Submission
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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
BERKSHIRE HATHAWAY INC
   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 __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
1440 KIEWIT PLAZA		 3. Date of Earliest Transaction (Month/Day/Year)
10/31/2008
(Street)

OMAHA, NE 68131		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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, $1.00 par value 10/31/2008   S   1,634,921 D (1) 89,279 D (2)  

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)		 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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BERKSHIRE HATHAWAY INC
1440 KIEWIT PLAZA
OMAHA, NE 68131		     X    
BUFFETT WARREN E
1440 KIEWIT PLAZA
OMAHA, NE 68131		     X    
GENERAL RE CORP
1440 KIEWIT PLAZA
OMAHA, NE 68131		     X    
GENERAL REINSURANCE CORP
1440 KIEWIT PLAZA
OMAHA, NE 68131		     X    

Signatures

 Berkshire Hathaway Inc., by Marc D. Hamburg   11/03/2008
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On October 31, 2008, General Reinsurance Corporation exchanged 1,634,921 common shares of White Mountains Insurance Group, Ltd. (?WTM?), at an exchange value of $485.00 per share, for 100% of the common stock of a subsidiary of WTM that holds Commercial Casualty Insurance Company, International American Group, Inc., and approximately $708 million in cash, pursuant to an Exchange Agreement, dated as of March 8, 2008, by and among Berkshire Hathaway Inc. (?Berkshire?), General Reinsurance Corporation (?General Reinsurance?), WTM, and Railsplitter Holdings Corporation.
(2) These securities are owned directly by General Reinsurance, which is a wholly owned subsidiary of General Re Corporation (?Gen Re?), which is a wholly owned subsidiary of Berkshire. Gen Re and Berkshire are indirect beneficial owners of the reported securities.

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