================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 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 27, 2003 COMMISSION FILE NUMBER: 0-12742 SPIRE CORPORATION - -------------------------------------------------------------------------------- (NAME OF SMALL BUSINESS ISSUER AS SPECIFIED IN ITS CHARTER) MASSACHUSETTS 04-2457335 - -------------------------------------------------------------------------------- (STATE OR OTHER JURISDICTION OF (I.R.S. EMPLOYER INCORPORATION OR ORGANIZATION) IDENTIFICATION NUMBER) ONE PATRIOTS PARK, BEDFORD, MASSACHUSETTS 01730-2396 - -------------------------------------------------------------------------------- (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE) (781) 275-6000 - -------------------------------------------------------------------------------- (ISSUER'S TELEPHONE NUMBER, INCLUDING AREA CODE) ================================================================================ ITEM 5. OTHER EVENTS - ---------------------- (a) On May 27, 2003 Spire Corporation (the "Company") announced that it had acquired Bandwidth Semiconductor, LLC of Hudson, New Hampshire. Bandwidth Semiconductor is a semiconductor foundry specializing in III-V materials and devices for defense and telecommunications applications. Additional information is set forth in Exhibit 99 to this Current Report on Form 8-K. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS - ------------------------------------------- (c) Exhibits: --------- 99 News Release of the Company dated May 27, 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. SPIRE CORPORATION (Registrant) Dated: June 5, 2003 By: /s/ Roger G. Little --------------------- Roger G. Little President, Chief Executive Officer and Chairman of the Board 2 EXHIBIT INDEX Exhibit Description - ------- ----------- 99 News Release of the Company dated May 27, 2003 3