SCHEDULE IV - REINSURANCE

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]

SCHEDULE IV - REINSURANCE

WHITE MOUNTAINS INSURANCE GROUP, LTD.

REINSURANCE

Column A	Column B		Column C		Column D		Column E		Column F
$ in Millions Premiums Earned	Gross Amount		Ceded to Other Companies		Assumed from Other Companies		Net Amount		Percentage of Amount Assumed to Net
Year ended:
December 31, 2023
HG Global/BAM	$	28.7	$	—	$	2.5	$	31.2	8.0	%
Ark/WM Outrigger	848.1		(364.0)		925.6		1,409.7		65.7
December 31, 2022
HG Global/BAM	28.6		—		4.7		33.3		14.1
Ark/WM Outrigger	655.5		(280.8)		668.7		1,043.4		64.1
December 31, 2021
HG Global/BAM	23.2		—		3.7		26.9		13.8
Ark/WM Outrigger	556.0		(249.1)		330.4		637.3		51.8

Schedules of the Registrant should be read in conjunction with the Consolidated Financial Statements and Notes.