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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
776867	White Mountains Insurance Group Ltd	WTM	Fire, Marine & Casualty Insurance (6331)	942708455

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1330678	Michael Angelo Frinquelli	C/O White Mountains Insurance Group, Ltd 80 South Main Street Hanover NH 03755		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Shares	Acquisiton	2010-05-03	100	$343.00	100	No	4	P	Indirect	by wife

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	by wife

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares	200	Direct
Common Shares	300	Indirect	by Trust
Common Shares	300	Indirect	By Renaissance Fund Advisors Inc.

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
Common Shares	Phantom Shares (Deferred Compensation)	$0.00			101	101	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
	101	101	Direct

Footnotes

Reporting Person is the sole shareholder of Renaissance Fund Advisors Inc.
Phantom Shares are convertible into Common Shares on a 1 for 1 basis.
The Phantom Shares are held in the Reporting Person's WTM deferred compensation account and are payable in cash upon the earlier of the date when the Reporting Person ceases to be a director of the Company or a date certain selected by the Reporting Person. The Reporting Person is scheduled to receive a final payout of the Phantom Shares in January 2011.