SCHEDULE IV REINSURANCE

12 Months Ended

Dec. 31, 2011

SCHEDULE IV REINSURANCE

SCHEDULE IV REINSURANCE

SCHEDULE IV

WHITE MOUNTAINS INSURANCE GROUP, LTD.

REINSURANCE

(Millions)

Column A	Column B		Column C			Column D		Column E		Column F
Premiums earned	Gross amount		Ceded to other companies			Assumed from other companies		Net amount		Percentage of amount assumed to net
Years ended:
December 31, 2011:
OneBeacon	$	1,138.5	$	(166.1	)	$	43.1	$	1,015.5	4.2	%
Sirius Group	128.5		(205.9		)	989.8		912.4		108.5	%
Other operations	—		—			—		—		—	%
December 31, 2010:
OneBeacon	$	1,732.5	$	(309.0	)	$	64.2	$	1,487.7	4.3	%
Sirius Group	117.9		(199.7		)	929.7		847.9		109.6	%
Other operations	—		—			—		—		—	%
December 31, 2009:
OneBeacon	$	2,122.4	$	(229.7	)	$	66.8	$	1,959.5	3.4	%
Sirius Group	107.2		(175.9		)	927.5		858.8		108.0	%
Other operations	—		—			—		—		—	%