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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CCHjoKjSSI+FEnr4maLYtQbCU+iHXkAq5xX6yedrNx2qDhpRPwtcO8uHFmQ7S4U2
 68o2Cb+xdsqvjrz5QE5O0g==

<SEC-DOCUMENT>0001179110-03-011344.txt : 20031126
<SEC-HEADER>0001179110-03-011344.hdr.sgml : 20031126
<ACCEPTANCE-DATETIME>20031126090327
ACCESSION NUMBER:		0001179110-03-011344
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031124
FILED AS OF DATE:		20031126

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KILLIAN RAYMOND L JR
		CENTRAL INDEX KEY:			0001019560

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-78309
		FILM NUMBER:		031024561

	BUSINESS ADDRESS:	
		STREET 1:		C/O INVESTMENT TECHNOLOGY GROUP INC
		STREET 2:		900 THIRD AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	MAIL ADDRESS:	
		STREET 1:		C/O INVESTMENT TECHNOLOGY GROUP INC
		STREET 2:		900 THIRD AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INVESTMENT TECHNOLOGY GROUP INC
		CENTRAL INDEX KEY:			0000920424
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				133757717
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		380 MADISON AVE
		STREET 2:		2ND FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2125884000

	MAIL ADDRESS:	
		STREET 1:		11100 SANTA MONICA BLVD
		STREET 2:		12TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90025
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2003-11-24</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000920424</issuerCik>
        <issuerName>INVESTMENT TECHNOLOGY GROUP INC</issuerName>
        <issuerTradingSymbol>ITG</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001019560</rptOwnerCik>
            <rptOwnerName>KILLIAN RAYMOND L JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ITG INC.</rptOwnerStreet1>
            <rptOwnerStreet2>380 MADISON AVENUE</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value>
</securityTitle>
<transactionDate><value>2003-11-24</value>
</transactionDate>
<transactionCoding><transactionFormType>4</transactionFormType>
<transactionCode>S</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts><transactionShares><value>50000</value>
</transactionShares>
<transactionPricePerShare><value>17.34</value>
<footnoteId id="F2"></footnoteId>
</transactionPricePerShare>
<transactionAcquiredDisposedCode><value>D</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts><sharesOwnedFollowingTransaction><value>100000</value>
<footnoteId id="F1"></footnoteId>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature><directOrIndirectOwnership><value>I</value>
</directOrIndirectOwnership>
<natureOfOwnership><value>Held through Killian Family LLC</value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<derivativeTable></derivativeTable>
<footnotes><footnote id="F1">The Reporting Person is a part owner of the Killian Family LLC, with the remaining equity in the LLC owned by members of his family. The Reporting Person has a pecuniary interest in only a portion of the total number of shares held by the LLC, and disclaims beneficial ownership of the shares held by the LLC in excess of his proportionate pecuniary interest. 534,350 shares of Common Stock held directly by the Reporting Person.  76,611 shares of Common Stock held through the ESOP Trust.</footnote>
<footnote id="F2">The price reflects the weighted average price at which the shares were sold. The actual prices ranged from $17.30 to $17.37 per share.</footnote>
</footnotes>
<ownerSignature><signatureName>Sophia Lee, by Power of Attorney filed with Form 4 dated October 15, 2002</signatureName>
<signatureDate>2003-11-25</signatureDate>
</ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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