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): May 14, 2004 GSI LUMONICS INC. ----------------- (Exact name of registrant as specified in its charter) New Brunswick, Canada No. 98-0110412 ------------------------------- ----------------------- -------------------- (State or other jurisdiction of (Commission File Number) I.R.S. Employer incorporation) Identification (No.) 39 Manning Road, Billerica, MA 01821 ---------------------------------------- ---------- (Address of principal executive offices) (Zip code) Registrant's telephone number, including area code: (978) 439-5511 N/A ------------------------------------------------------------- (Former Name or Former Address, if changed since last report) Item 5. Regulation FD Disclosures ---------------------------------- On May 17, 2004, GSI Lumonics Inc. ("GSI") issued a press release announcing the closing of its acquisition of MicroE Systems Corp., a Delaware corporation ("MicroE"). A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. Item 7. Financial Statements, Pro Forma Financial Information and Exhibits -------------------------------------------------------------------------- (c) Exhibits 99.1 Press Release dated May 17, 2004. 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. GSI LUMONICS INC. By: /s/ Thomas R. Swain --------------------------------- Thomas R. Swain Vice President, Finance and Chief Financial Officer Date: May 17, 2004 EXHIBIT INDEX Exhibit No. Description 99.1 Press Release dated May 17, 2004