8-K/A

                            FORM 8-K--CURRENT REPORT




                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                             ----------------------



                                    FORM 8-K/A

                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported). April 21, 2000.
                                                         -----------------------

                                   NFYIX, INC.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

             New York                 0-21324                    06-1344888
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   (State or other jurisdiction     (Commission                 (IRS Employer
   of incorporation)                File Number)             Identification No.)

                      333 Ludlow Street, Stamford, CT 06902
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               (Address of principal executive offices) (Zip Code)


       Registrant's telephone number, including area code: (203) 425-8000


                                       N/A
- --------------------------------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)





Item 4. Changes in Registrant's Certifying Accountant.

         The Audit  Committee of the  Company's  Board of  Directors  approved a
change in the  Company's  independent  accountants  for the  fiscal  year  ended
December 31, 2000,  from Arthur  Andersen LLP ("Arthur  Andersen") to Deloitte &
Touche LLP  ("Deloitte & Touche").  Arthur  Andersen was  dismissed on April 21,
2000 and Deloitte & Touche was engaged on April 27,  2000.  The report of Arthur
Andersen  for teach of the three  years in the period  ended  December  31, 1999
contained  no  adverse  opinions,  disclaimer  of opinion  or  qualification  or
modification as to  uncertainty,  audit scope or accounting  principles.  During
each of the three years ended  December  31, 1999,  there were no  disagreements
between  the  Company  and  Arthur  Andersen  on any  accounting  principles  or
practices, financial statement disclosure or auditing scope or procedure, which,
if not resolved to the  satisfaction  of Arthur Andersen would have caused it to
make reference to the subject matter of the  disagreement in connection with its
report.  No event  described in paragraph  (a) (1) (v) of Item 304 of Regulation
S-K has occurred  within the Company for each of the three years ended  December
31, 1999.

         The Company has provided Arthur Anderson with a copy of the disclosures
contained herein.

         The Company did not consult with  Deloitte & Touche  during each of the
three years in the period  ended  December  31, 1999 on any matter which was the
subject of any  disagreement  or any reportable  event or on the  application of
accounting principles to a specified transaction, either completed or proposed.

Item 7. Financial Statements and Exhibits.

(c)      Exhibit 16

         Letter from Arthur Anderson,  dated April 24, 2000, regarding change in
         Certifying Accountant .



                                       -2-



                                    SIGNATURE

                  Pursuant to the requirements of the Securities Exchange Act of
1934,  the  Registrant has duly caused this report to be signed on its behalf by
the undersigned hereunto duly authorized.

                                             NYFIX, INC.



Dated: May 8, 2000                      By:  /s/ Peter K. Hansen
                                             -----------------------------------
                                             Name:  Peter Hansen
                                             Title: Chairman of the Board and
                                                    President


                                       -3-

EX-16

                                 ARTHUR ANDERSEN


Office of the Chief Accountant
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

April 24, 2000

Dear Sir/Madam:

We have read Item 4 included in the attached Form 8-K of NYFIX,  Inc. filed with
the Securities and Exchange  Commission and are in agreement with the statements
contained therein.


Very truly yours,


/s/ Arthur Andersen LLP
Arthur Andersen LLP

Copies to:
Mr. Peter Hanson, Chairman, NYFIX, Inc.
Mr. John Chapman, Chairman of the Audit Committee, NYFIX, Inc.