<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT
     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934


       Date of Report (Date of earliest event reported) September 1, 2005
                                                        -----------------

                                 FUEL-TECH N.V.
             (Exact name of registrant as specified in its charter)


    NETHERLANDS ANTILLES              000-2174                      N/A
(State or other jurisdiction        (Commission                (IRS Employer
      of incorporation)             File Number)             Identification No.)


             FUEL-TECH N.V.                           FUEL TECH, INC.
              (Registrant)                     (U.S. Operating Subsidiary)
             CASTORWEG 22-24                        695 E. MAIN STREET
     CURACAO, NETHERLANDS ANTILLES                   STAMFORD CT 06901
            (599) 9-461-3754                          (203) 425-9830

          (ADDRESS AND TELEPHONE NUMBER OF PRINCIPAL EXECUTIVE OFFICES)




                                    --more--
<PAGE>

ITEM 7.01. REGULATION FD DISCLOSURE

         On September 1, 2005 the Registrant issued the press release attached
as Exhibit 99.1 to this current report on Form 8-K. This press release, in
paragraph three thereof, confirmed the revenue guidance of $45 million to $48
million for the fiscal year 2005 earlier announced in the earnings release for
the quarter ended June 30, 2005 attached as Exhibit 99.1 to the Registrant's
Current Report on Form 8-K dated August 3, 2005. This information is not to be
deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of
1934 or otherwise subject to the liabilities of that Section.

                                   SIGNATURES

         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.

                                            FUEL-TECH N.V.

Date: September 1, 2005                     By: /s/ V. J. Arnone
                                                ----------------
                                                Vincent J. Arnone
                                                Vice President, Treasurer
                                                and Chief Financial Officer
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{"company-data": {"conformed-name": "FUEL TECH N V", "cik": "0000846913", "assigned-sic": "3564", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-21724", "film-number": "051063302"}, "business-address": {"street1": "CASTORWEG 22-24", "city": "CURACAO NETHERLANDS", "state": "P7"}, "mail-address": {"street1": "C/O FUEL TECH INC", "street2": "300 ATLANTIC ST", "city": "STAMFORD", "state": "CT", "zip": "06901"}}
UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

       Date of Report (Date of earliest event reported) September 1, 2005
                                                        -----------------

                                 FUEL-TECH N.V.
             (Exact name of registrant as specified in its charter)

    NETHERLANDS ANTILLES              000-2174                      N/A
(State or other jurisdiction        (Commission                (IRS Employer
      of incorporation)             File Number)             Identification No.)

             FUEL-TECH N.V.                           FUEL TECH, INC.
              (Registrant)                     (U.S. Operating Subsidiary)
             CASTORWEG 22-24                        695 E. MAIN STREET
     CURACAO, NETHERLANDS ANTILLES                   STAMFORD CT 06901
            (599) 9-461-3754                          (203) 425-9830

          (ADDRESS AND TELEPHONE NUMBER OF PRINCIPAL EXECUTIVE OFFICES)

                                    --more--
ITEM 7.01. REGULATION FD DISCLOSURE

         On September 1, 2005 the Registrant issued the press release attached
as Exhibit 99.1 to this current report on Form 8-K. This press release, in
paragraph three thereof, confirmed the revenue guidance of $45 million to $48
million for the fiscal year 2005 earlier announced in the earnings release for
the quarter ended June 30, 2005 attached as Exhibit 99.1 to the Registrant's
Current Report on Form 8-K dated August 3, 2005. This information is not to be
deemed "filed" for the purposes of Section 18 of the Securities Exchange Act of
1934 or otherwise subject to the liabilities of that Section.

                                   SIGNATURES

         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.

                                            FUEL-TECH N.V.

Date: September 1, 2005                     By: /s/ V. J. Arnone
                                                ----------------
                                                Vincent J. Arnone
                                                Vice President, Treasurer
                                                and Chief Financial Officer