SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* GILLESPIE JOHN DAVIES (Last) (First) (Middle) C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET (Street) HANOVER NH 03755 (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 06/28/2006
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

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								1,676	D
Common Shares								50,000(1)	I	See Footnote (1)
Common Shares								14	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 (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 Securities Underlying Derivative Security (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: 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)	06/28/2006		A		15(3)		(4)	(4)	Common Shares	15	$490.47(5)	3,682	D

Explanation of Responses:

1. Prospector Partners Fund L.P. ("Prospector") is the beneficial owner of 29,122 Common Shares; Prospector Offshore Fund (Bermuda) Ltd. ("Prospector Offshore") is the beneficial owner of 16,720 Common Shares; and Prospector Partners Small Cap Fund L.P. ("Prospector Small Cap") is the beneficial owner of 4,158 Common Shares. Mr. Gillespie disclaims beneficial ownership of the Common Shares owned by Prospector, Prospector Offshore and Prospector Small Cap except to the extent of his pecuniary interest therein. Mr. Gillespie's interest is limited to that as the principal of the general partner of each of Prospector and Prospector Small Cap and as principal of the investment manager of Prospector Offshore.

2. Phantom Shares are convertible into Common Shares on a 1 for 1 basis.

3. On June 28, 2006, 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 payable, as a result of the Reporting Person's separation of employment from WTM, in cash, in ten equal annual installments that commenced on October 6, 2005. Final payment is due on October 6, 2014.

5. Dividends are automatically invested in Phantom Shares at the fair market price per share on the underlying WTM Common Shares on June 28, 2006, the date the dividends are deemed to be paid.

Remarks:

	Jason Lichtenstein, by Power of Attorney	06/29/2006
	** Signature of Reporting Person	Date
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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