<SEC-DOCUMENT>0001104659-21-104158.txt : 20210812
<SEC-HEADER>0001104659-21-104158.hdr.sgml : 20210812
<ACCEPTANCE-DATETIME>20210812160935
ACCESSION NUMBER:		0001104659-21-104158
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20210630
FILED AS OF DATE:		20210812
DATE AS OF CHANGE:		20210812
EFFECTIVENESS DATE:		20210812

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:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-01681
		FILM NUMBER:		211167605

	BUSINESS ADDRESS:	
		STREET 1:		23 SOUTH MAIN STREET
		STREET 2:		SUITE 3B
		CITY:			HANOVER
		STATE:			NH
		ZIP:			03755
		BUSINESS PHONE:		603 640 2200

	MAIL ADDRESS:	
		STREET 1:		23 SOUTH MAIN STREET
		STREET 2:		SUITE 3B
		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>
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        <credentials>
          <cik>0000776867</cik>
          <ccc>XXXXXXXX</ccc>
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      <periodOfReport>06-30-2021</periodOfReport>
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    <coverPage>
      <reportCalendarOrQuarter>06-30-2021</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>White Mountains Insurance Group Ltd</name>
        <address>
          <ns1:street1>23 South Main Street</ns1:street1>
          <ns1:street2>Suite 3B</ns1:street2>
          <ns1:city>Hanover</ns1:city>
          <ns1:stateOrCountry>NH</ns1:stateOrCountry>
          <ns1:zipCode>03755</ns1:zipCode>
        </address>
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      <reportType>13F HOLDINGS REPORT</reportType>
      <form13FFileNumber>028-01681</form13FFileNumber>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Michaela J. Hildreth</name>
      <title>Managing Director and Chief Accounting Officer</title>
      <phone>603-640-2200</phone>
      <signature>/s/ Michaela J. Hildreth</signature>
      <city>Boston</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>08-12-2021</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
      <tableEntryTotal>1</tableEntryTotal>
      <tableValueTotal>713174</tableValueTotal>
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    <nameOfIssuer>MEDIAALPHA INC</nameOfIssuer>
    <titleOfClass>CL A</titleOfClass>
    <cusip>58450V104</cusip>
    <value>713174</value>
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