<Page>
                       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):  June 5, 2003
                                                       ------------

                                       0-17080
                              (Commission File Number)
                              ------------------------

                               UNITRONIX CORPORATION
                               ---------------------
              (Exact name of Registrant as specified in its charter)


                                     NEW JERSEY
                                     ----------
          (State or other jurisdiction of incorporation or organization)


                                     22-2086851
-                                -----------------
)                                (I.R.S. Employer
                                Identification No.)


     One Newbury Street, Peabody, MA                           01960
     -------------------------------                           -----
  (Address of Principal Executive Offices)                    (Zip Code)


      Registrant's telephone number, including area code: (978) 535-3912
                                                          --------------


                                       N/A
                                       ---
                                  Former Address







<Page>


                             UNITRONIX CORPORATI0N


ITEM 5. OTHER EVENTS.

Unitronix Corporation issued the press release attached hereto as Exhibit 99.1
on June 5, 2003.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

        (c) Exhibits

            99.1 Press Release of Unitronix Corporation dated June 5, 2003.

                                  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.

                                            UNITRONIX CORPORATION
                                            (Registrant)


Date:  June 6, 2003                      /s/William C. Wimer
       ------------                      -------------------
                                            William C. Wimer
                                            Vice President of Operations &
                                               Chief Financial Officer

<Page>


                                 EXHIBIT INDEX

       EXHIBIT
        NUMBER        DESCRIPTION
        ------        -----------
         99.1         Press Release of Unitronix Corporation dated
                      June 5, 2003
[{"type": "8-K", "sequence": "1", "filename": "norand8k.txt", "description": "FORM 8-K", "secsgml_size_bytes": 2993}]
{"company-data": {"conformed-name": "UNITRONIX CORP", "cik": "0000835270", "assigned-sic": "7373", "irs-number": "222086851", "state-of-incorporation": "NJ", "fiscal-year-end": "0630"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-17080", "film-number": "03735231"}, "business-address": {"street1": "ONE NEWBURY ST", "street2": "PEABODY OFFICE BLDG", "city": "PEABODY", "state": "MA", "zip": "01960", "phone": "9785353912"}, "mail-address": {"street1": "PEABODY OFFICE BLDG", "street2": "ONE NEWBURY ST", "city": "PEABODY", "state": "MA", "zip": "01960"}}
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):  June 5, 2003
                                                       ------------

                                       0-17080
                              (Commission File Number)
                              ------------------------

                               UNITRONIX CORPORATION
                               ---------------------
              (Exact name of Registrant as specified in its charter)

                                     NEW JERSEY
                                     ----------
          (State or other jurisdiction of incorporation or organization)

                                     22-2086851
-                                -----------------
)                                (I.R.S. Employer
                                Identification No.)

     One Newbury Street, Peabody, MA                           01960
     -------------------------------                           -----
  (Address of Principal Executive Offices)                    (Zip Code)

      Registrant's telephone number, including area code: (978) 535-3912
                                                          --------------

                                       N/A
                                       ---
                                  Former Address
UNITRONIX CORPORATI0N

ITEM 5. OTHER EVENTS.

Unitronix Corporation issued the press release attached hereto as Exhibit 99.1
on June 5, 2003.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

        (c) Exhibits

            99.1 Press Release of Unitronix Corporation dated June 5, 2003.

                                  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.

                                            UNITRONIX CORPORATION
                                            (Registrant)

Date:  June 6, 2003                      /s/William C. Wimer
       ------------                      -------------------
                                            William C. Wimer
                                            Vice President of Operations &
                                               Chief Financial Officer
EXHIBIT INDEX

       EXHIBIT
        NUMBER        DESCRIPTION
        ------        -----------
         99.1         Press Release of Unitronix Corporation dated
                      June 5, 2003