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): February 15, 2000 0-27352 (Commission File Number) ------------------------------ HYBRIDON, INC. (Exact name of registrant as specified in its charter) Delaware 3072298 (State of Incorporation) (IRS Employer Identification Number) 155 Fortune Blvd., Milford, Massachusetts 01757 (Address of registrant's principal executive office) (508) 482-7500 (Registrant's telephone number) ------------------------------ ITEM 5. OTHER EVENTS On February 15, 2000, Hybridon, Inc. issued the press release attached hereto as Exhibit 99.1. ITEM 7 FINANCIAL STATEMENTS AND EXHIBITS Exhibit No. Title ----------- ----- 99.1 Press release dated February 15, 2000 2 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, thereunto duly authorized. HYBRIDON, INC. By: /s/ Sudhir Agrawal ----------------------------------- Name: Sudhir Agrawal Title: President and Acting Chief Executive Officer Date: February 15, 2000 3