SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION

12 Months Ended

Dec. 31, 2011

SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION

SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION

SCHEDULE III

WHITE MOUNTAINS INSURANCE GROUP, LTD.

SUPPLEMENTARY INSURANCE INFORMATION

(Millions)

Column A	Column B		Column C		Column D		Column E		Column F		Column G			Column H		Column I		Column J		Column K
Segment	Deferred acquisition costs		Future policy benefits, losses, claims and loss expenses		Unearned premiums		Other policy claims and benefits payable		Premiums earned		Net investment income(1)			Benefits, claims, losses, and settlement expenses		Amortization of deferred policy acquisition costs		Other operating expenses		Premiums written
Years ended:
December 31, 2011:
OneBeacon	$	123.5	$	3,358.6	$	528.0	$	—	$	1,015.5	$	66.8		$	580.9	$	219.0	$	173.3	$	1,062.9
Sirius Group	63.5		2,343.7		319.0		—		912.3		89.9			626.0		181.0		105.8		915.7
Other operations	—		—		—		—		—		8.0			—		—		—		—
December 31, 2010:
OneBeacon	$	114.5	$	3,295.5	$	627.5	$	—	$	1,487.7	$	96.3		$	930.2	$	320.7	$	246.5	$	1,236.3
Sirius Group	61.6		2,441.3		311.2		—		847.9		90.5			531.0		167.5		99.8		865.8
Other operations	—		—		—		—		—		1.3			—		—		—		—
December 31, 2009:
OneBeacon	$	215.0	$	3,934.8	$	1,018.3	$	—	$	1,959.5	$	127.4		$	1,121.9	$	398.3	$	330.0	$	1,906.7
Sirius Group	57.2		2,444.4		287.5		—		858.8		107.7			418.8		170.9		98.1		806.8
Other operations	—		—		—		—		—		(.1		)	—		—		—		—

(1)The amounts shown exclude net investment income (expense) relating to non-insurance operations in the other operations segment of $19.8, $14.8 and $12.5 for the twelve months ended December 31, 2011, 2010 and 2009, respectively.