Unassociated Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(A) OF

THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. )

Filed by the Registrant ý
Filed by a Party other than the Registrant ¨
Check the appropriate box:
¨		Preliminary Proxy Statement
¨		Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
¨		Definitive Proxy Statement
ý		Definitive Additional Materials
¨		Soliciting Material Pursuant to §240.14a-12
NYFIX, INC.
(Name of Registrant as Specified In Its Charter)


(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
ý		No fee required
¨		Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11

	(1)		Title of each class of securities to which transaction applies:

	(2)		Aggregate number of securities to which transaction applies:

	(3)		Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

	(4)		Proposed maximum aggregate value of transaction:

	(5)		Total fee paid:

¨	Fee paid previously with preliminary materials:

¨	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

		(1)	Amount Previously Paid:

		(2)	Form, Schedule or Registration Statement No.:

		(3)	Filing Party:

		(4)	Date Filed:

The following letter is being sent by NYFIX, Inc. to certain holders of its common stock beginning on November 16, 2007.

100 Wall Street – 26^th Floor

New York, NY 10005

November 16, 2007

Dear Stockholder:

We have previously sent to you proxy materials for the NYFIX, Inc. Annual Meeting of Stockholders to be held on December 11, 2007. Your Board of Directors has unanimously recommended that stockholders vote FOR all of the items on the agenda.

Your vote is important, no matter how many or how few shares you may own. Please vote TODAY by telephone, via the Internet, or by signing, dating and returning the enclosed voting instruction form in the envelope provided.

Very truly yours,

Scott A. Bloom

Secretary

REMEMBER:

You can vote your shares by telephone through a toll-free number or via the Internet.

Please follow the easy instructions on the enclosed voting instruction form.

If you have any questions, or need assistance in voting

your shares, please call our proxy solicitor,

INNISFREE M&A INCORPORATED

TOLL-FREE, at 1-888-750-5834.