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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 L5mpoyTcxIV3tQ36+L1H5A==

<SEC-DOCUMENT>0000949308-08-000161.txt : 20080430
<SEC-HEADER>0000949308-08-000161.hdr.sgml : 20080430
<ACCEPTANCE-DATETIME>20080430152925
ACCESSION NUMBER:		0000949308-08-000161
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071114
FILED AS OF DATE:		20080430
DATE AS OF CHANGE:		20080430

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:			CAPITAL GROUP INTERNATIONAL INC
		CENTRAL INDEX KEY:			0000949308
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33812
		FILM NUMBER:		08789642

	BUSINESS ADDRESS:	
		STREET 1:		11100 SANTA MONICA BOULEVARD 15TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90025-3384
		BUSINESS PHONE:		2134869501

	MAIL ADDRESS:	
		STREET 1:		CAPITAL GROUP INTERNATIONAL INC
		STREET 2:		11100 SANTA MONICA BLVD 15TH FL
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90025-3384
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<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>0000949308</rptOwnerCik>
            <rptOwnerName>CAPITAL GROUP INTERNATIONAL INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CAPITAL GROUP INTERNATIONAL, INC</rptOwnerStreet1>
            <rptOwnerStreet2>333 S. HOPE STREET</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071-1406</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2861235.21</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Class B Common Stock is convertible at any time at the holder's option on a one-for-one basis into Class A Common Stock and has no expiration date. The Class B Common Stock is automatically converted into Class A Common Stock upon any sale by the reporting person to any party other than Capital Group International, Inc., or its subsidiaries or affiliates. Class B Common Stock generally has identical rights as Class A Common Stock, except that holders of Class A Common Stock are entitled to one vote per share while holders of Class B Common Stock are entitled to five votes per share on matters to be voted on by shareholders with certain exceptions.</footnote>
        <footnote id="F2">Immediately after the pricing of the Issuer's initial public offering (&quot;IPO&quot;) of its class A common stock, par value $.01 per share (the &quot;Class A Common Stock&quot;), the Issuer amended its certificate of incorporation. The amendment and restatement, among other things, (i) created two new classes of stock, the Class A Common Stock  and the class B common stock, par value $.01 per share (the &quot;Class B Common Stock&quot;), which generally is convertible into Class A Common Stock on a one-for-one basis and (ii) reclassified each of the Issuer's then-outstanding shares of common stock, par value $1.00 per share (the &quot;Common Stock&quot;) into 2,861.235208 shares of Class B Common Stock (the &quot;Reclassification&quot;).</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Peter C. Kelly, Secretary</signatureName>
        <signatureDate>2008-04-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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