Exhibit 4.6

      *CONFIDENTIAL MATERIAL HAS BEEN OMITTED AND FILED SEPARATELY WITH THE
                                  COMMISSION.

                                 FIRST AMENDMENT

                                       TO

                    AMENDED AND RESTATED OPERATING AGREEMENT

                                       OF

                       VAN DER MOOLEN SPECIALISTS USA, LLC

                            Dated: December 30, 2004

         FIRST AMENDMENT, dated December 30, 2004 (the "Amendment"), to the
Amended and Restated Operating Agreement, dated December 1, 2004, (the
"Operating Agreement"), of Van der Moolen Specialists USA, LLC, a New York
limited liability company (the "Company"), by and among the entity and
individuals listed on Schedule A hereto (each, a "Member" and collectively, the
"Members").

         WHEREAS, the Company has issued $20,000,000 8% Senior Subordinated
Notes, due December 30, 2004 (the "Notes");

         WHEREAS, the Notes are governed by the terms and provisions of that
certain Amended and Restated Note Purchase Agreement, dated August 3, 2001, as
amended by that certain First Amendment to Note Purchase Agreement, dated March
1, 2002 (as so amended and restated the "Note Purchase Agreement");

         WHEREAS, pursuant to the Note Purchase Agreement, the Company is
required to repay $5 million in Notes on the date hereof;

         WHEREAS, in connection with the foregoing repayment, the Members deem
it desirable to increase the Company's Stated Capital from $* to $*;

         WHEREAS, in connection with the foregoing increase of the Company's
stated capital, each Member shall make a contribution to the capital of the
Company in an amount equal to such Member's Profit & Loss Percentage multiplied
by $*, except that MBIV shall make a further capital contribution of *%
multiplied by $* to fund the Float;

         WHEREAS, the Members wish to provide for the appointment to the
Company's Management Committee of persons other than Members of the Company;

         WHEREAS, the Members wish to amend the Operating Agreement of the
Company to (i) reflect the Company's Stated Capital being increased from $* to
$*, and (ii) effect certain other changes as set forth herein.




      *CONFIDENTIAL MATERIAL HAS BEEN OMITTED AND FILED SEPARATELY WITH THE
                                  COMMISSION.

         NOW, THEREFORE, in consideration of the foregoing premises and the
terms and conditions set forth in this Amendment, the Members hereby agree as
follows:

         1. Capitalized terms used but not defined herein shall have the
meanings ascribed to such terms in the Operating Agreement.

         2. Each Member agrees to make, and on the date hereof shall make, a
contribution to the capital of the Company in the amount set forth opposite its,
his or her name below:

                      ----------------------- -----------------
                                              Required Capital
                              Member            Contribution
                      ----------------------- -----------------
                      Mill Bridge IV, LLC                    *
                      ----------------------- -----------------
                      Jason N. Blatt                         *
                      ----------------------- -----------------
                      Nicholas Brigandi                      *
                      ----------------------- -----------------
                      Robert J. Burke                        *
                      ----------------------- -----------------
                      Terence P. Burns                       *
                      ----------------------- -----------------
                      James J. Campanella                    *
                      ----------------------- -----------------
                      Matthew C. Cebulski                    *
                      ----------------------- -----------------
                      James P. Cleaver, Jr.                  *
                      ----------------------- -----------------
                      Forrest Close, II                      *
                      ----------------------- -----------------
                      Christopher Dearborn                   *
                      ----------------------- -----------------
                      James E. DeMaira, Jr.                  *
                      ----------------------- -----------------
                      Charles P. Dolan                       *
                      ----------------------- -----------------
                      John F. X. Dolan                       *
                      ----------------------- -----------------
                      Robert B. Fagenson                     *
                      ----------------------- -----------------

                                       2



      *CONFIDENTIAL MATERIAL HAS BEEN OMITTED AND FILED SEPARATELY WITH THE
                                  COMMISSION.


                      ----------------------- -----------------
                                              Required Capital
                              Member            Contribution
                      ----------------------- -----------------

                      ----------------------- -----------------
                      Paul D. Frankel                        *
                      ----------------------- -----------------
                      Andrew J. Grabowski                    *
                      ----------------------- -----------------
                      Robert W. Grahame                      *
                      ----------------------- -----------------
                      Stephen R. Green                       *
                      ----------------------- -----------------
                      Thomas M. Greenhill                    *
                      ----------------------- -----------------
                      Steven Grossman                        *
                      ----------------------- -----------------
                      Mark A. Innaimo                        *
                      ----------------------- -----------------
                      Philip T. Keating                      *
                      ----------------------- -----------------
                      M. Andica Kunst                        *
                      ----------------------- -----------------
                      Kevin J. Lyden                         *
                      ----------------------- -----------------
                      Mark J. Mazzella                       *
                      ----------------------- -----------------
                      Scott E. Mazzella                      *
                      ----------------------- -----------------
                      Michael J. McDonnell                   *
                      ----------------------- -----------------
                      Scott E. McMahon                       *
                      ----------------------- -----------------
                      James L. Miller                        *
                      ----------------------- -----------------
                      David A. Miranda                       *
                      ----------------------- -----------------
                      Irwin Misshula                         *
                      ----------------------- -----------------
                      John D. Monahan                        *
                      ----------------------- -----------------
                      Daniel Morrisey                        *
                      ----------------------- -----------------
                      Nicholas R. Orlando                    *
                      ----------------------- -----------------
                      Eric B. Osher                          *
                      ----------------------- -----------------
                      Thomas Perry                           *
                      ----------------------- -----------------
                      Steven M. Rubinstein                   *
                      ----------------------- -----------------
                      Edward J. Scavone                      *
                      ----------------------- -----------------
                      James J. Scavone                       *
                      ----------------------- -----------------
                      Stephen M. Scavone                     *
                      ----------------------- -----------------
                      Thomas E. Scavone                      *
                      ----------------------- -----------------
                      Thomas H. Shafer                       *
                      ----------------------- -----------------
                      Stephan J. Sherman                     *
                      ----------------------- -----------------
                      Christopher C. Smith                   *
                      ----------------------- -----------------
                      Gregg Sorrentino                       *
                      ----------------------- -----------------
                      Robert M. Spiegelberg                  *
                      ----------------------- -----------------
                      Louis J. Spina                         *
                      ----------------------- -----------------
                      Martin B. Steinthal III                *
                      ----------------------- -----------------
                      Glen R. Surnamer                       *
                      ----------------------- -----------------
                      Joseph A. Talento                      *
                      ----------------------- -----------------
                      Joseph V. Talento                      *
                      ----------------------- -----------------
                      Albert Veenstra                        *
                      ----------------------- -----------------
                      Thomas J. Verdiglione                  *
                      ----------------------- -----------------
                      Mark E. Wagner                         *
                      ----------------------- -----------------
                      Gregory R. Wertz                       *
                      ----------------------- -----------------
                      Harold Yosco                           *
                      ----------------------- -----------------
                                       TOTAL                 *
                      ----------------------- -----------------

                                       3



         3. Section 5.2(a) of the Operating Agreement is hereby amended to read
in its entirety as follows:

         "The Management Committee shall consist of not less than three nor more
         than eight members, the exact number of which shall be determined from
         time to time by resolution adopted by Supermajority Vote. If any member
         of the Management Committee ceases to be a Member or employee of the
         Company for any reason, such person's membership on the Management
         Committee shall terminate automatically, in the case of Management
         Committee member who is a Member of the Company, upon his Termination
         Date or, in the case of a Management Committee member who is an
         employee of the Company, upon the effective date of termination of such
         employee. A member of the Management Committee may resign at any time
         by notice to the other members of the Management Committee, and the
         Management Committee may remove a member of the Management Committee by
         notice to such member; such resignation or removal shall be effective
         at the time specified in the notice. The resignation or removal of a
         member of the Management Committee shall not, in and of itself, affect,
         in the case of Management Committee member who is a Member of the
         Company, the interest of such Member in the Company or, in the case of
         a Management Committee member who is an employee of the Company, his
         employment status with the Company. Any vacancy in the Management
         Committee, whether by a member of the Management Committee ceasing to
         be such a member or by an increase in the size of the Management
         Committee, shall be filled by a Supermajority."

         4. Schedule A to the Operating Agreement is hereby deleted and Schedule
A annexed to this Amendment shall be substituted therefor.

         5. In all other respects the Operating Agreement is hereby ratified and
confirmed in its entirety.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK;
                             SIGNATURE PAGES FOLLOW]











         IN WITNESS WHEREOF, the Members have executed this Amendment as of the
date and year first written above.

MILL BRIDGE IV, LLC


By:
      ----------------------------     --------------------------------
       Name:                           JASON N. BLATT
       Title: Manager



- --------------------------------       --------------------------------
NICHOLAS R. BRIGANDI                   ROBERT J. BURKE



- --------------------------------       --------------------------------
TERRENCE P. BURNS                      JAMES J. CAMPANELLA



- --------------------------------       --------------------------------
MATTHEW C. CEBULSKI                    JAMES P. CLEAVER, JR.



- --------------------------------       --------------------------------
FORREST CLOSE, II                      CHRISTOPHER S. DEARBORN



- --------------------------------       --------------------------------
JAMES E. DEMAIRA, JR.                  CHARLES P. DOLAN



- --------------------------------       --------------------------------
JOHN F. X. DOLAN                       ROBERT B. FAGENSON



- --------------------------------       --------------------------------
PAUL D. FRANKEL                        ANDREW J. GRABOWSKI









- --------------------------------       --------------------------------
ROBERT W. GRAHAME                      STEPHEN R. GREEN



- --------------------------------       --------------------------------
THOMAS M. GREENHILL                    STEVEN GROSSMAN



- --------------------------------       --------------------------------
MARK A. INNAIMO                        PHILIP T. KEATING



- --------------------------------       --------------------------------
M. ANDICA KUNST                        KEVIN J. LYDEN



- --------------------------------       --------------------------------
MARK J. MAZZELLA                       SCOTT E. MAZZELLA



- --------------------------------       --------------------------------
MICHAEL J. MCDONNELL                   SCOTT E. MCMAHON



- --------------------------------       --------------------------------
JAMES L. MILLER                        DAVID A. MIRANDA


- --------------------------------       --------------------------------
IRWIN MISSHULA                         JOHN D. MONAHAN


- --------------------------------       --------------------------------
DANIEL P. MORRISEY                     NICHOLAS S. ORLANDO






- --------------------------------       --------------------------------
ERIC B. OSCHER                         THOMAS PERRY



- --------------------------------       --------------------------------
STEVEN M. RUBINSTEIN                   EDWARD J. SCAVONE


- --------------------------------       --------------------------------
JAMES J. SCAVONE                       STEPHEN M. SCAVONE



- --------------------------------       --------------------------------
THOMAS E. SCAVONE                      THOMAS H. SHAFER


- --------------------------------       --------------------------------
STEPHEN J. SHERMAN                     CHRISTOPHER C. SMITH



- --------------------------------       --------------------------------
GREGG F. SORRENTINO                    ROBERT M. SPIEGELBERG



- --------------------------------       --------------------------------
LOUIS J. SPINA                         MARTIN B. STEINTHAL, III


- --------------------------------       --------------------------------
GLEN R. SURNAMER                       JOSEPH A. TALENTO






- --------------------------------       --------------------------------
JOSEPH V. TALENTO                      ALBERT VEENSTRA

- --------------------------------       --------------------------------
THOMAS J. VERDIGLIONE                  MARK E. WAGNER

- --------------------------------       --------------------------------
GREGORY R. WERTZ                       HAROLD YOSCO














     *CONFIDENTIAL MATERIAL HAS BEEN OMITTED AND FILED SEPARATELY WITH THE
                                  COMMISSION.


                                   Schedule A
                                   ----------

                                       to

                    AMENDED AND RESTATED OPERATING AGREEMENT

                                       of

                       VAN DER MOOLEN SPECIALISTS USA, LLC
                       -----------------------------------

                            Dated: December 30, 2004


- ---------------------------------------------------------------------------------------------------
                                                MEMBERS
- ---------------------------------------------------------------------------------------------------
                                                               Stated             Profit and Loss
              Name                               Address     Capital ($)           Percentage (%)
              ----                               -------     -----------           --------------

                                                                              
Mill Bridge IV, LLC               45 Broadway, 29th Fl.                   *            75.0000
                                  New York, NY 10006
- --------------------------------- ----------------------- ------------------ ----------------------
Jason N. Blatt                    *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Nicholas Brigandi                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Robert J. Burke                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Terence P. Burns                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
James J. Campanella               *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Matthew C. Cebulski               *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
James P. Cleaver, Jr.             *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Forrest Close, II                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Christopher S. Dearborn           *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
James E. DeMaira, Jr.             *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Charles P. Dolan                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
John F. X. Dolan                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Robert B. Fagenson                *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------


                                       i






- --------------------------------- ----------------------- ------------------ ----------------------
                                                                                   
Paul D. Frankel                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Andrew J. Grabowski               *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Robert W. Grahame                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Stephen R. Green                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Thomas M. Greenhill               *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Steven Grossman                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Mark A. Innaimo                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Philip T. Keating                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
M. Andica Kunst                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Kevin J. Lyden                    *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Mark J. Mazzella                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Scott E. Mazzella                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Michael J. McDonnell              *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Scott E. McMahon                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
James L. Miller                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
David A. Miranda                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Irwin Misshula                    *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
John D. Monahan                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Daniel Morrisey                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Nicholas R. Orlando               *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Eric B. Osher                     *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Thomas Perry                      *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Steven M. Rubinstein              *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Edward J. Scavone                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
James J. Scavone                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Stephen M. Scavone                *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Thomas E. Scavone                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Thomas H. Shafer                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Stephan J. Sherman                *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Christopher C. Smith              *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Gregg Sorrentino                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Robert M. Spiegelberg             *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Louis J. Spina                    *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Martin B. Steinthal III           *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Glen R. Surnamer                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Joseph A. Talento                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Joseph V. Talento                 *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Albert Veenstra                   *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Thomas J. Verdiglione             *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Mark E. Wagner                    *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Gregory R. Wertz                  *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
Harold Yosco                      *                                       *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
                                         Float Percentage                 *                  *
- --------------------------------- ----------------------- ------------------ ----------------------
                                                    TOTAL                 *           100,000%
- --------------------------------- ----------------------- ------------------ ----------------------


                                       ii