WHITE MOUNTAINS INSURANCE GROUP LTD — Director's Dealing 2012

May 29, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK: 0000776867
Period of Report: 2012-05-24

Reporting Person: CLARK HOWARD LONGSTRETH JR (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-24	Common Shares	A	200	—	Acquired	970	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Phantom Shares (Deferred Compensation)	$		Common Shares (0)	204	Direct

Footnotes

F1: Annual Director Share Award.

F2: Reflects transfer out on February 7, 2012 of 630 Common Shares pursuant to a DRO.

F3: Phantom Shares are convertible into Common Shares on a 1 for 1 basis.

F4: The Phantom Shares are held in the Reporting Person's WTM deferred compensation account and are payable in cash at such time as the Reporting Person ceases to be a director of the Company.

F5: Reflects accumulation of fractional Phantom Shares accumulating to 1 additional Phantom Share since last reported holding.