<SEC-DOCUMENT>0001668244-18-000002.txt : 20180103
<SEC-HEADER>0001668244-18-000002.hdr.sgml : 20180103
<ACCEPTANCE-DATETIME>20180103200639
ACCESSION NUMBER:		0001668244-18-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180101
FILED AS OF DATE:		20180103
DATE AS OF CHANGE:		20180103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Rountree George Manning
		CENTRAL INDEX KEY:			0001457475

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-08993
		FILM NUMBER:		18508054

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

ISSUER:		

	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

	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>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-01-01</periodOfReport>

    <issuer>
        <issuerCik>0000776867</issuerCik>
        <issuerName>WHITE MOUNTAINS INSURANCE GROUP LTD</issuerName>
        <issuerTradingSymbol>WTM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001457475</rptOwnerCik>
            <rptOwnerName>Rountree George Manning</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O WHITE MOUNTAINS INSURANCE GROUP LTD</rptOwnerStreet1>
            <rptOwnerStreet2>80 SOUTH MAIN ST.</rptOwnerStreet2>
            <rptOwnerCity>HANOVER</rptOwnerCity>
            <rptOwnerState>NH</rptOwnerState>
            <rptOwnerZipCode>03755</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2018-01-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1187</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>851.28</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6660</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares (restricted)</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5800</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>87</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by 401(k)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On January 1, 2018, 3000 restricted Common Shares became unrestricted.  1187 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations.</footnote>
        <footnote id="F2">Reflects accumulation of 4 Common Shares in Reporting Person's Company 401(k) account since his last filed report.  Such Common Shares were purchased at fair market value on the date of purchase.  The information in this report is based on a plan report dated as of January 2, 2018.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Wesley C. Bell, by Power of Attorney</signatureName>
        <signatureDate>2018-01-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>rountree_poa2016.htm
<DESCRIPTION>POWER OF POWER
<TEXT>
<HTML><BODY><PRE>Know all by these present, that the undersigned hereby

constitutes and appoints each of Robert L. Seelig, Managing Director & General

Counsel, and Jennifer L. Pitts, Secretary, of White

Mountains Insurance Group, Ltd., Jason R. Lichtenstein,

Managing Director & Associate General Counsel, and Wesley Bell,

Vice President & Assistant General Counsel, signing singly,

the undersigned's true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the

undersigned's capacity as an officer and/or director of White

Mountains Insurance Group, Ltd. (the "Company"), Forms 3, 4,

and 5 in accordance with Section 16(a) of the Securities

Exchange Act of 1934 and the rules thereunder;

(2) do and perform any and all acts for and on behalf of the

undersigned which may be necessary or desirable to complete

and execute any such Form 3, 4, or 5, complete and execute

any amendment or amendments thereto, and timely file such form

with the United States Securities and Exchange Commission and

any stock exchange or similar authority; and

(3) take any other action of any type whatsoever in connection

with the foregoing which, in the opinion of such attorney-in-fact,

may be of benefit to, in the best interest of, or legally

required by, the undersigned, it being understood that the

documents executed by such attorney-in-fact on behalf of the

undersigned pursuant to this Power of Attorney shall be in

such form and shall contain such terms and conditions as such

attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full

power and authority to do and perform any and every act and thing

whatsoever requisite, necessary, or proper to be done in the

exercise of any of the rights and powers herein granted, as

fully to all intents and purposes as the undersigned might or

could do if personally present, with full power of substitution or

revocation, hereby ratifying and confirming all that such

attorney-in-fact, or such attorney-in-fact's substitute or

substitutes, shall lawfully do or cause to be done by virtue of

this power of attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing attorneys-in-fact,

in serving in such capacity at the request of the undersigned,

are not rendering legal advice of any form, other than satisfying

regulatory filing requirements, with respect to any transactions

to be reported on Forms 3, 4 and 5 are not assuming, nor is the

Company assuming, any of the undersigned's responsibilities to

comply with Section 16 of the Securities Exchange Act of 1934.

The undersigned hereby grants this Power of Attorney with the

understanding that information provided to each such

attorney-in-fact is strictly confidential and will not be

disclosed to senior management, directors or other third parties

whether affiliated or otherwise and will be used solely to

complete and execute any such Form 3, 4 or 5, complete and

execute any amendment or amendments thereto, and timely file

such form with the United States Securities and Exchange Commission

and any stock exchange or similar authority

This Power of Attorney shall remain in full force and effect

until the undersigned is no longer required to file Forms 3,

4, and 5 with respect to the undersigned's holdings of and

transactions in securities issued by the Company, unless

earlier revoked by the undersigned in a signed writing

delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this

Power of Attorney to be executed as of this

25th day of February 2016.



/s/  G. Manning Rountree

</PRE></BODY></HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
