SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ----------------

                                 SCHEDULE 13G/A
                                 (Rule 13d-102)
                                ----------------

              INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO
                   RULES 13d-1(b), (c) AND (d) AND AMENDMENTS
                    THERETO FILED PURSUANT TO 13d-2 UNDER THE
                         SECURITIES EXCHANGE ACT OF 1934
                               (Amendment No. 4)*

                                 Fuel-Tech N.V.
                                (Name of Issuer)

                          Common Stock, par value $.01
                         (Title of Class of Securities)

                                    359523107
                                 (CUSIP Number)

                                December 31, 2005
             (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
     [ ]  Rule 13d-1(b)
     [X]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)

                              (Page 1 of 13 Pages)

----------

     * The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.


     The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).



Schedule 13G/A                                                    Page 2 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Phaeton International (BVI) Ltd.
           None
------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           British Virgin Islands
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    379,998
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    379,998
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
           379,998
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           1.9%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           CO
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 3 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON S.S. OR
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Phoenix Partners, L.P.
           13-6272912
------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    428,100
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    428,100
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
           428,100
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           2.1%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           PN
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 4 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON S.S. OR
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Phoenix Partners II, L.P.
           84-1631449
------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           Delaware
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    132,202
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    132,202
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
           132,202
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           0.7%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           PN
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 5 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON S.S. OR
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Phoenix Partners III, L.P.
           32-0145065
------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           Delaware
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    9,700
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    9,700
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
           9,700
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           0.05%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           PN
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 6 of 13
CUSIP No. 359523107

     (1) NAME OF REPORTING PERSON S.S. OR
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Morgens, Waterfall, Vintiadis & Co., Inc.

------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           New York
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    950,000
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    950,000
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
           950,000
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           4.3%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           IA
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 7 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON S.S. OR
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Edwin H. Morgens

------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
           United States
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    25,000
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    950,000
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    25,000
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    950,000
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON
                                     975,000
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)
           4.8%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           IN
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 8 of 13
CUSIP No. 359523107

     (1)  NAME OF REPORTING PERSON S.S. OR
          I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           John C. Waterfall

------------------------------------------------------------------------
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                               (a)  [ ]
                                                               (b)  [X]
------------------------------------------------------------------------
     (3)  SEC USE ONLY

------------------------------------------------------------------------
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION
          United States
------------------------------------------------------------------------

NUMBER OF      (5)  SOLE VOTING POWER
                    0
SHARES         ---------------------------------------------------------

BENEFICIALLY   (6)  SHARED VOTING POWER
                    950,000
OWNED BY       ---------------------------------------------------------

EACH           (7)  SOLE DISPOSITIVE POWER
                    0
REPORTING      ---------------------------------------------------------

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                    950,000
------------------------------------------------------------------------
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                     950,000
------------------------------------------------------------------------
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT
          IN ROW (9) EXCLUDES CERTAIN SHARES                        [ ]
------------------------------------------------------------------------
    (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
           4.3%
------------------------------------------------------------------------
    (12)  TYPE OF REPORTING PERSON
           IN
------------------------------------------------------------------------



Schedule 13G/A                                                    Page 9 of 13
CUSIP No. 359523107

         The Schedule 13G/A filed on February 14, 2005 is hereby amended and
restated by this Amendment No. 4 to the Schedule 13G/A.

ITEM 1(a).  NAME OF ISSUER:
              Fuel-Tech N.V.

ITEM 1(b).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
              Castorweg 22-24, Curacao, Netherlands Antilles

ITEM 2(a).  NAME OF PERSON FILING:
              This Schedule 13G is filed jointly by (a) Phaeton International
              (BVI) Ltd. ("Phaeton"), (b) Phoenix Partners, L.P. ("Phoenix"),
              (c) Phoenix Partners II, L.P. ("Phoenix II"), (d) Phoenix Partners
              III, L.P. ("Phoenix III"), (e) Morgens, Waterfall, Vintiadis &
              Company, Inc. ("Morgens Waterfall"), (f) Edwin H. Morgens
              ("Morgens") and (g) John C. Waterfall ("Waterfall" and together
              with the persons listed in (a) through (f), the "Reporting
              Persons").

              Phaeton, Phoenix, Phoenix II and Phoenix III are hereinafter
              sometimes collectively referred to as the "Advisory Clients".

ITEM 2(b).  ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:
              The business address of each of the Reporting Persons is 600 Fifth
              Avenue, 27th Floor, New York NY 10020.

ITEM 2(c).  CITIZENSHIP:
              Phoenix is a limited partnership organized under the laws of the
              State of New York. Phoenix II is a limited partnership organized
              under the laws of the State of Delaware. Phoenix III is a limited
              partnership organized under the laws of the State of Delaware.
              Phaeton is an exempted company organized in the British Virgin
              Islands. Morgens Waterfall is a corporation organized under the
              laws of the State of New York. Each of Morgens and Waterfall are
              United States citizens.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:
              Common stock, par value $.01

ITEM 2(e).  CUSIP NUMBER:
              359523107

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:

           (a) [ ] Broker or dealer registered under Section 15 of the Act

           (b) [ ] Bank as defined in Section 3(a)(6) of the Act

           (c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act

           (d) [ ] Investment Company registered under Section 8 of the
                   Investment Company Act of 1940



Schedule 13G/A                                                   Page 10 of 13
CUSIP No. 359523107

           (e) [ ] Investment Adviser registered under Section 203 of the
                   Investment Advisers Act of 1940: see Rule 13d- 1(b)(1)(ii)(E)

           (f) [ ] Employee Benefit Plan, Pension Fund which is subject to the
                   provisions of the Employee Retirement Income Security Act of
                   1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F)

           (g) [ ] Parent Holding Company, in accordance with Rule 13d-
                   1(b)(ii)(G);

           (h) [ ] Savings Associations as defined in Section 3(b) of the
                   Federal Deposit Insurance Act;

           (i) [ ] Church Plan that is excluded from the definition of an
                   investment company under Section 3(c)(14) of the Investment
                   Company Act of 1940;

           (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

         IF THIS STATEMENT IS FILED PURSUANT TO Rule 13d-1(c),
         CHECK THIS BOX.                                           [x]

ITEM 4.  OWNERSHIP.
         A.   Phaeton International (BVI) Ltd
                (a) Amount beneficially owned: 379,998
                (b) Percent of class: 1.9%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 379,998
                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       379,998

         B.   Phoenix Partners, L.P.
                (a) Amount beneficially owned: 428,100
                (b) Percent of class: 2.1%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 428,100
                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       428,100

         C.   Phoenix Partners II, L.P.
                (a) Amount beneficially owned: 132,202
                (b) Percent of class: 0.7%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 132,202
                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       132,202

         D.   Phoenix Partners III, L.P.
                (a) Amount beneficially owned: 9,700
                (b) Percent of class: 0.05%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 9,700


Schedule 13G/A                                                   Page 11 of 13
CUSIP No. 359523107

                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       9,700


         E.   Morgens, Waterfall, Vintiadis & Co., Inc.
                (a) Amount beneficially owned: 950,000
                (b) Percent of class: 4.3%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 950,000
                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       950,000

         F. Edwin H. Morgens
                (a) Amount beneficially owned: 975,000
                (b) Percent of class: 4.8%
                (c)(i) Sole power to vote or direct the vote: 25,000
                  (ii) Shared power to vote or direct the vote: 950,000
                 (iii) Sole power to dispose or direct the disposition: 25,000
                  (iv) Shared power to dispose or direct the disposition:
                       950,000

         G. John C. Waterfall
                (a) Amount beneficially owned: 950,000
                (b) Percent of class: 4.3%
                (c)(i) Sole power to vote or direct the vote: -0-
                  (ii) Shared power to vote or direct the vote: 950,000
                 (iii) Sole power to dispose or direct the disposition: -0-
                  (iv) Shared power to dispose or direct the disposition:
                       950,000

ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
            If this statement is being filed to report the fact that as of the
            date hereof the reporting person has ceased to be the beneficial
            owner of more than five percent of the class of securities, check
            the following [X].

ITEM 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
            Not applicable.

ITEM 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
          THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
            Not applicable.

ITEM 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
            Not applicable.

ITEM 9.   NOTICE OF DISSOLUTION OF GROUP.
            Not applicable.

ITEM 10.  CERTIFICATION.  (if filing pursuant to Rule 13d-1(c))



Schedule 13G/A                                                   Page 12 of 13
CUSIP No. 359523107

            By signing below each Reporting Person certifies that, to the best
            of its knowledge and belief, the securities referred to above were
            not acquired and are not held for the purpose of or with the effect
            of changing or influencing the control of the issuer of the
            securities and were not acquired and are not held in connection with
            or as a participant in any transaction having that purpose or
            effect.



Schedule 13G/A                                                   Page 13 of 13
CUSIP No. 359523107

                                    SIGNATURE

      After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.

DATED:  February 9, 2006


                                    /s/ John C. Waterfall
                                    -----------------------------------
                                    John C. Waterfall,
                                    as attorney-in-fact for
                                    the Reporting Persons