POWER OF ATTORNEY


The undersigned, David Meitz, does hereby make,
constitute and appoint Howard C. Naphtali, P. Mats
Goebels, Angelo Bulone and Sophia Lee, and each of
them, true and lawful attorneys-in-fact and agents with
full power of substitution and resubstitution, in any
and all capacities, to execute for and on behalf of the
undersigned the reports and filings required under
Section 16 of the Securities Exchange Act of 1934, as
amended (the Exchange Act), and the rules promulgated
thereunder (the Section 16 Reports), in connection with
transactions by and beneficial ownership of the
undersigned in securities issued by Investment
Technology Group, Inc. (the Company), and the Form 144
required under Rule 144 of the Securities Act of 1933,
as amended (the Securities Act), in connection with any
sales by the undersigned of securities issued by the
Company, and any other documents and instruments
incidental to any of the foregoing, granting unto said
attorneys-in-fact and agents, and each of them, full
power and authority to do and perform each and every
act and thing that said attorneys-in-fact and agents,
and each of them, deem advisable or necessary,
including filing the Section 16 Reports, the Forms 144,
and amendments thereto with the Securities and Exchange
Commission, and the undersigned does hereby fully
ratify and confirm all that said attorneys-in-fact and
agents, or any of them, or their or his or her
substitute or substitutes, shall do or cause to be done
by virtue hereof.

The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the
request of the undersigned, are not assuming, nor is
the Company assuming, any of the undersigned`s
responsibilities to comply with Section 16 of the
Exchange Act or Rule 144 of the Securities Act.

This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to
file the Forms 144 or the Section 16 Reports with
respect to the undersigned's holdings of and
transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.

        IN WITNESS WHEREOF, the undersigned has
subscribed his name,
this 5th day of January, 2004.



						/s/ David Meitz
	_________________________
        Ian Domowitz