LETTER 1 filename1.txt October 25, 2005 Mr. Howard C. Naphtali Chief Financial Officer Investment Technology Group, Inc. 380 Madison Avenue New York, New York 10017 Re: Form 10-K for the fiscal year ended December 31, 2004 File No. 333-78309 Dear Mr. Naphtali: We have completed our review of your Form 10-K and related filings and have no further comments at this time. Sincerely, Joyce Sweeney Branch Chief