<SEC-DOCUMENT>0001104659-18-032199.txt : 20180510
<SEC-HEADER>0001104659-18-032199.hdr.sgml : 20180510
<ACCEPTANCE-DATETIME>20180510163954
ACCESSION NUMBER:		0001104659-18-032199
CONFORMED SUBMISSION TYPE:	13F-NT
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180331
FILED AS OF DATE:		20180510
DATE AS OF CHANGE:		20180510
EFFECTIVENESS DATE:		20180510

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-NT
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-01681
		FILM NUMBER:		18823190

	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>
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<TYPE>13F-NT
<SEQUENCE>1
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  <headerData>
    <submissionType>13F-NT</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <filer>
        <credentials>
          <cik>0000776867</cik>
          <ccc>XXXXXXXX</ccc>
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      <periodOfReport>03-31-2018</periodOfReport>
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  <formData>
    <coverPage>
      <reportCalendarOrQuarter>03-31-2018</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>White Mountains Insurance Group Ltd</name>
        <address>
          <ns1:street1>80 South Main Street</ns1:street1>
          <ns1:city>Hanover</ns1:city>
          <ns1:stateOrCountry>NH</ns1:stateOrCountry>
          <ns1:zipCode>03755</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F NOTICE</reportType>
      <form13FFileNumber>028-01681</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <cik>0001253840</cik>
          <form13FFileNumber>028-10494</form13FFileNumber>
          <name>White Mountains Advisors LLC</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>J. Brian Palmer</name>
      <title>Managing Director &amp; Chief Accounting Officer</title>
      <phone>603-640-2200</phone>
      <signature>/s/ J. Brian Palmer</signature>
      <city>Boston</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>05-10-2018</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
      <tableEntryTotal>0</tableEntryTotal>
      <tableValueTotal>0</tableValueTotal>
      <isConfidentialOmitted>false</isConfidentialOmitted>
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