1 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): June 11, 2001 ------------- 0-027352 ------------------------ (Commission File Number) HYBRIDON, INC. --------------------------------------------------------------------- (Exact Name of Registrant as Specified in Its Charter) Delaware 04-3072298 ------------------------------- ------------------- (State or Other Jurisdiction of (I.R.S. Employer Incorporation) Identification No.) 345 Vassar Street, Cambridge, Massachusetts 02139 ------------------------------------------------- (Address of Principal Executive Offices) (617) 679-5500 ---------------------------------------------------- (Registrant's Telephone Number, Including Area Code)

2 OTHER EVENTS ITEM 5. Hybridon, Inc. plans to have private discussions from time to time with holders of (a) its Series B Convertible Preferred Stock and (b) various warrants, to explore their interest in converting such convertible preferred stock into, or exercise such warrants to purchase, shares of the Company's common stock in the near term. The Company has retained an investment banking firm to assist it in identifying proposals, which would be fair and appropriate to induce such holders to convert their preferred shares or exercise their warrants within the near term. Such proposals might involve a reduction in the conversion price or exercise price, as the case may be, or the cash-free exchange of a reduced number of shares of the Company's common stock in cancellation of the preferred shares or warrants. The Company's purpose would be to reduce the number of outstanding securities which are convertible into or exercisable for the purchase of shares of the Company's common stock and to simplify the Company's capital structure. Such discussions may lead to agreements whereby the holders of such securities accept such proposals and convert their preferred stock, or exercise their warrants for the purchase of, shares of the Company's common stock. The Company has not entered into any such arrangements and may determine at any time not to proceed with such plans. To the extent such discussions or agreements constitute the offer and sale of securities under the Securities Act of 1933 in the United States, the Company expects to make such offers and sales in reliance upon an exemption from the registration requirements of that Act. 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: June 11, 2001