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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CWZl/Sd9laarWiOLzaCfxq6uTo2/1xgfFASFz+2B3w6Uw76r94o6eKqayahhC4PU
 cdSyIX3g+lOvo7Vrw1Jf9Q==

<SEC-DOCUMENT>0000950103-07-002743.txt : 20071114
<SEC-HEADER>0000950103-07-002743.hdr.sgml : 20071114
<ACCEPTANCE-DATETIME>20071114083123
ACCESSION NUMBER:		0000950103-07-002743
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071114
FILED AS OF DATE:		20071114
DATE AS OF CHANGE:		20071114

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MSCI Inc.
		CENTRAL INDEX KEY:			0001408198
		STANDARD INDUSTRIAL CLASSIFICATION:	PERIODICALS:  PUBLISHING OR PUBLISHING AND PRINTING [2721]
		IRS NUMBER:				134038723
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1130

	BUSINESS ADDRESS:	
		STREET 1:		88 PINE STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10005
		BUSINESS PHONE:		212-804-3990

	MAIL ADDRESS:	
		STREET 1:		88 PINE STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10005

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			deRegt Kenneth Michael
		CENTRAL INDEX KEY:			0001330293

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33812
		FILM NUMBER:		071240877

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(415) 315-3692

	MAIL ADDRESS:	
		STREET 1:		FOUR EMBARCADERO CENTER, SUITE 2050
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94111
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>dp07543_3-deregtex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-11-14</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001408198</issuerCik>
        <issuerName>MSCI Inc.</issuerName>
        <issuerTradingSymbol>MXB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001330293</rptOwnerCik>
            <rptOwnerName>deRegt Kenneth Michael</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>88 PINE STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10005</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Kenneth M. deRegt</signatureName>
        <signatureDate>2007-11-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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