Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  D. E. SHAW LAMINAR PORTFOLIOS, L.L.C.
 2. Date of Event Requiring Statement (Month/Day/Year)
11/08/2007		 3. Issuer Name and Ticker or Trading Symbol
INVESTMENT TECHNOLOGY GROUP INC [ITG]
(Last)
(First)
(Middle)
39TH FLOOR, TOWER 45, 120 WEST FORTY-FIFTH STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See footnotes 1 and 2
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10036		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 4,396,392
D (1) (2)
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
D. E. SHAW LAMINAR PORTFOLIOS, L.L.C.
39TH FLOOR, TOWER 45
120 WEST FORTY-FIFTH STREET
NEW YORK, NY 10036		     X   See footnotes 1 and 2
D. E. SHAW & CO, L.L.C.
39TH FLOOR, TOWER 45
120 WEST FORTY-FIFTH STREET
NEW YORK, NY 10036		     X   See footnotes 1 and 2
D. E. SHAW & CO, L.P.
39TH FLOOR, TOWER 45
120 WEST FORTY-FIFTH STREET
NEW YORK, NY 10036		     X   See footnotes 1 and 2
SHAW DAVID E
39TH FLOOR, TOWER 45
120 WEST FORTY-FIFTH STREET
NEW YORK, NY 10036		     X   See footnotes 1 and 2

Signatures

D. E. Shaw Laminar Portfolios, L.L.C. By: D. E. Shaw & Co. L.L.C., as Managing Member By: /s/ Rochelle Elias, Chief Compliance Officer 11/19/2007
**Signature of Reporting Person Date
D. E. Shaw & Co., L.P. By: /s/ Rochelle Elias, Chief Compliance Officer 11/19/2007
**Signature of Reporting Person Date
D. E. Shaw & Co., L.L.C. By: /s/ Rochelle Elias, Chief Compliance Officer 11/19/2007
**Signature of Reporting Person Date
David E. Shaw By: Rochelle Elias, Attorney-in-Fact 11/19/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The securities of the Issuer to which this form relates are held directly by D. E. Shaw Laminar Portfolios, L.L.C. ("Laminar") and D. E. Shaw Synoptic Portfolios 2, L.L.C. ("Synoptic"). D. E. Shaw & Co., L.P. ("DESCO LP"), as investment adviser to Laminar and Synoptic; D. E. Shaw & Co., L.L.C. ("DESCO LLC"), as managing member of Laminar and Synoptic; and David E. Shaw (as president and sole shareholder of D. E. Shaw & Co., Inc., which is the general partner of DESCO LP, and as president and sole shareholder of D. E. Shaw & Co. II, Inc., which is the managing member of DESCO LLC), may be deemed to be the beneficial owners of more than 10% of the Common Stock of the Issuer for purposes of Rule 16a-1(a) of the Securities Exchange Act of 1934.
(2) (Continued from Footnote 1) In accordance with General Instruction 5(b)(iv), the entire number of shares of Common Stock that may be deemed to be beneficially owned by Laminar, Synoptic, DESCO LP, DESCO LLC, or David E. Shaw are reported herein. Each of Laminar, Synoptic, DESCO LP, DESCO LLC, and David E. Shaw disclaims beneficial ownership of the securities listed in this Form 3, except to the extent of any pecuniary interest therein.

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