SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS

12 Months Ended

Dec. 31, 2012

Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]

SCHEDULE VI SUPPLEMENTAL INFORMATION FOR PROPERTY AND CASUALTY INSURANCE UNDERWRITERS

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 acquisition costs		Reserves for Unpaid Claims and Claims Adjustment Expenses		Discount, if any, deducted in Column C			Unearned Premiums		Earned Premiums		Net investment income		Claims and Claims Adjustment Expenses Incurred Related to					Amortization of deferred policy acquisition costs		Paid Claims and Claims Adjustment Expenses		Premiums written
Affiliation with registrant	Deferred acquisition costs		Reserves for Unpaid Claims and Claims Adjustment Expenses		Discount, if any, deducted in Column C			Unearned Premiums		Earned Premiums		Net investment income		(1) Current Year		(2) Prior Year			Amortization of deferred policy acquisition costs		Paid Claims and Claims Adjustment Expenses		Premiums written
OneBeacon:
2012	$	123.9	$	1,000.0	$	4.6	⁽¹⁾	$	573.8	$	1,132.0	$	53.6	$	657.4	$	(7.4	)	$	249.4	$	565.1	$	1,179.2
2011	123.5		3,358.6		271.6		⁽¹⁾	528.0		1,012.2		71.4		578.1		(29.8		)	221.2		523.2		1,062.7
2010	114.5		3,295.5		295.9		⁽¹⁾	627.5		1,181.1		96.6		721.6		(36.0		)	252.1		654.8		1,167.7
Sirius Group:
2012	$	71.4	$	2,168.9	$	2.4	⁽²⁾	$	350.2	$	931.6	$	65.0	$	578.4	$	(34.5	)	$	180.8	$	741.2	$	947.7
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

⁽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 (3.5%, 4.5% and 5.0% at December 31, 2012, 2011 and 2010). 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, 2012, 2011 and 2010.


⁽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.