<SEC-DOCUMENT>0000776867-19-000013-index.html : 20190506
<SEC-HEADER>0000776867-19-000013.hdr.sgml : 20190506
<ACCEPTANCE-DATETIME>20190503175611
ACCESSION NUMBER:		0000776867-19-000013
CONFORMED SUBMISSION TYPE:	11-K
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20181231
FILED AS OF DATE:		20190506
DATE AS OF CHANGE:		20190503

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WHITE MOUNTAINS INSURANCE GROUP LTD
		CENTRAL INDEX KEY:			0000776867
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				942708455
		STATE OF INCORPORATION:			D0
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		11-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08993
		FILM NUMBER:		19797530

	BUSINESS ADDRESS:	
		STREET 1:		80 SOUTH MAIN ST
		CITY:			HANOVER
		STATE:			NH
		ZIP:			03755
		BUSINESS PHONE:		603 640 2200

	MAIL ADDRESS:	
		STREET 1:		80 SOUTH MAIN STREET
		CITY:			HANOVER
		STATE:			NH
		ZIP:			03755

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WHITE MOUNTAINS INSURANCE GROUP INC
		DATE OF NAME CHANGE:	19990603

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FUND AMERICAN ENTERPRISES HOLDINGS INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FUND AMERICAN COMPANIES INC
		DATE OF NAME CHANGE:	19920701
</SEC-HEADER>
<DOCUMENT>
<TYPE>11-K
<SEQUENCE>1
<FILENAME>a11-kapril2019.htm
<DESCRIPTION>11-K
<TEXT>
Document 1 - file: a11-kapril2019.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>sarp146312_20181231.jpg
<DESCRIPTION>WTM RETIREMENT PLAN
<TEXT>
Document 2 - file: sarp146312_20181231.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>scheduleitoform5500_2018xp.jpg
<DESCRIPTION>FORM 5500
<TEXT>
Document 3 - file: scheduleitoform5500_2018xp.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>scheduleitoform5500_2018xp1.jpg
<DESCRIPTION>FORM 5500
<TEXT>
Document 4 - file: scheduleitoform5500_2018xp1.jpg

</DOCUMENT>
</SEC-DOCUMENT>