SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                                   NYFIX, INC.
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             (Exact name of Registrant as specified in its charter)


           New York                                 06-1344888
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(State or other jurisdiction of                (I.R.S. employer
incorporation or organization)                 identification no.)


333 Ludlow Street, Stamford, Connecticut              06902
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(Address of principal executive offices)            (Zip code)


If this form relates to the  registration  of a class of securities  pursuant to
Section  12(b)  of  the  Exchange  Act  and is  effective  pursuant  to  General
Instruction A.(c), please check the following box. / /

If this form relates to the  registration  of a class of securities  pursuant to
Section  12(g)  of  the  Exchange  Act  and is  effective  pursuant  to  General
Instruction A.(d), please check the following box. /X/

Securities Act registration statement file number to which this form relates:


Securities to be registered pursuant to Section 12(b) of the Act: None

Securities to be registered pursuant to Section 12(g) of the Act:

                          Common Stock, $.001 par value
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                                (Title of Class)



Item 1.           Description of Securities To Be Registered.

         A description of the common stock, $.001 per share (the "Common Stock")
of NYFIX,  Inc. (the "Company") is contained  under the caption  "Description of
Securities"  in the  Company's  Registration  Statement  on Form S-1, as amended
(Registration No. 033-61298),  filed with the Securities and Exchange Commission
on April 19, 1993 and incorporated herein by reference.



Item 2.           Exhibits.



         3.1      Articles  of  Incorporation  of NYFIX,  Inc.  (Exhibit  3.1 to
                  Registrant's Form 10 filed March 5, 1993).

         3.2      Certificate  of  Amendment  to  Articles of  Incorporation  of
                  NYFIX,  Inc.  (Exhibit  3.3 to the  Company's  Form S-3  filed
                  December 30, 1999).

         3.3      By-Laws of NYFIX,  Inc.  (Exhibit 3.2 to Registrant's  Form 10
                  filed March 5, 1993).

         4.1      Certificate  of  Designation  of  Series  A  Preferred   Stock
                  (Exhibit 4.1 to Registrant's Form 10 filed March 5, 1993).

         4.2      Specimen  -  Common  Stock  Certificate  (Exhibit  4.2  to the
                  Registrant's  Annual  Report on Form 10K for the  fiscal  year
                  ended December 31, 1993).

         4.3      Rights Agreement,  dated as of September 1, 1997,  between the
                  Registrant and Chase Mellon Shareholder  Services,  L.L.C., as
                  Rights  Agent  (Exhibit 1 to the  Registrant's  Form 8-A filed
                  September 10, 1997).

         4.4      First Amendment to Rights  Agreement,  dated as of October 25,
                  1999,  between  Trinitech  Systems,   Inc.  and  Chase  Mellon
                  Shareholder  Services,  L.L.C.  (Exhibit 3 to the Registrant's
                  Form 8-A/A filed October 25, 1999).


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                                    SIGNATURE

                  Pursuant to the  requirements  of Section 12 of the Securities
Exchange Act of 1934, the registrant has duly caused this registration statement
to be signed on its behalf by the undersigned, thereto duly authorized.

Dated: March 3, 2000                      NYFIX, INC.



                                          By: /s/ Richard Castillo
                                             -----------------------------------
                                             Name: Richard Castillo
                                             Title: Chief Financial Officer


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