1 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 August 7, 2001 -------------- Date of Report (Date of earliest event reported) OSI PHARMACEUTICALS, INC. ------------------------- (Exact name of registrant as specified in its charter) DELAWARE 0-15190 13-3159796 (State or other jurisdiction of (Commission (I.R.S. Employer incorporation) File Number) Identification No.) 58 SOUTH SERVICE ROAD MELVILLE, NY 11747 ---------------------------------------- (Address of principal executive offices) (631) 962-2000 -------------------------------------------------- (Registrant's telephone number, including area code) 106 CHARLES LINDBERGH BOULEVARD UNIONDALE, NY 11553 -------------------------------- (Former name or former address, if changed since last report.) 2 ITEM 5. OTHER EVENTS On August 7, 2001, OSI Pharmaceuticals, Inc., a Delaware corporation (the "Company") announced that it had entered into an agreement to acquire certain of the pre-clinical research operations of British Biotech plc (LSE: BBG; Nasdaq: BBIOY) for (pound sterling) 8.7 million (approximately $12.4 million) in cash. Further details regarding the transaction and facility reorganization are contained in the Company's press release, dated August 7, 2001, attached as Exhibit 99, and incorporated herein by reference. ITEM 7. EXHIBITS - -------------------------------------------------------------- EXHIBIT NO. DESCRIPTION - -------------------------------------------------------------- 99 Press release, dated August 7, 2001. - -------------------------------------------------------------- 3 SIGNATURE 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. Date: August 13, 2001 OSI PHARMACEUTICALS, INC. By: /s/ Robert L. Van Nostrand ---------------------------------- Robert L. Van Nostrand Vice President and Chief Financial Officer (Principal Financial Officer) 4 EXHIBIT INDEX - ------------------------------------------------------------- EXHIBIT NO. DESCRIPTION - ------------------------------------------------------------- 99 Press release, dated August 7, 2001. - -------------------------------------------------------------