SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS

12 Months Ended

Dec. 31, 2011

SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS

SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS

SCHEDULE VI

WHITE MOUNTAINS INSURANCE GROUP, LTD.

SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS
(Millions)

Column A	Column B		Column C		Column D			Column E		Column F		Column G		Column H					Column I		Column J		Column K
	Deferred		Reserves for Unpaid Claims and Claims		Discount, if any,							Net		Claims and Claims Adjustment Expenses Incurred Related to					Amortization of deferred policy		Paid Claims and Claims
Affiliation with registrant	acquisition costs		Adjustment Expenses		deducted in Column C			Unearned Premiums		Earned Premiums		investment income		(1) Current Year		(2) Prior Year			acquisition costs		Adjustment Expenses		Premiums written
OneBeacon:
2011	$	123.5	$	3,358.6	$	271.6	(1)	$	528.0	$	1,015.5	$	71.4	$	583.8	$	(2.9	)	$	219.0	$	714.8	$	1,062.9
2010	114.5		3,295.5		295.9		(1)	627.5		1,487.7		96.6		981.4		(51.2		)	320.7		1,038.8		1,236.3
2009	215.0		3,934.8		317.5		(1)	1,018.3		1,959.5		125.5		1,205.3		(83.4		)	398.3		1,176.1		1,906.7
Sirius Group:
2011	$	63.5	$	2,343.7	$	12.8	(2)	$	319.0	$	912.3	$	89.9	$	672.9	$	(46.9	)	$	181.0	$	642.0	$	915.7
2010	61.6		2,441.3		21.1		(2)	311.2		847.9		90.5		588.1		(57.1		)	167.5		437.0		865.8
2009	57.2		2,444.4		29.5		(2)	287.5		858.8		107.7		449.1		(30.4		)	170.9		772.9		806.8
Other operations:
2011	$	—	$	—	$	—		$	—	$	—	$	—	$	—	$	—		$	—	$	—	$	—
2010	—		—		—			—		—		—		—		—			—		—		—
2009	—		—		—			—		—		—		—		—			—		—		—
50%-or-less owned property and casualty investees:(3)
Delos(4):
2011	$	—	$	—	$	—		$	—	$	—	$	—	$	—	$	—		$	—	$	—	$	—
2010	—		—		—			—		—		—		—		—			—		—		—
2009	3.9		73.3		—			26.1		33.3		1.7		24.3		—			—		18.2		31.7

(1)The amounts shown represent OneBeacon’s discount on its long-term workers compensation loss and LAE reserves, as such liabilities constitute unpaid but settled claims under which the payment pattern and ultimate costs are fixed and determinable on an individual basis. OneBeacon discounts these reserves using a discount rate which is determined based on the facts and circumstances applicable at the time the claims are settled (4.5%, 5.0% and 5.3% at December 31, 2011, 2010 and 2009). Also the amounts shown include unamortized fair value adjustments to reserves for unpaid claims and claims adjustment expenses made in purchase accounting as a result of White Mountains’ purchase of OneBeacon for the years ended December 31, 2011, 2010 and 2009.

(2)The amount shown represents unamortized fair value adjustments to reserves for unpaid claims and claims adjustment expenses made in purchase accounting as a result of White Mountains’ purchase of Sirius International during 2004.

(3)The amounts shown represent White Mountains’ share of its 50% owned unconsolidated property and casualty insurance affiliates.

(4)In August 2006, White Mountains acquired an equity interest of approximately 18% in Delos.  During the fourth quarter of 2010, White Mountains sold its entire interest in Delos.