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): October 14, 1999 ---------------- LEUKOSITE, INC. --------------- (Exact Name of Registrant as Specified in Charter) Delaware 0-22769 04-3173859 -------- ------- ---------- (State or Other Jurisdiction (Commission (IRS Employer of Incorporation) File Number) Identification No.) 215 First Street, Cambridge, MA 02142 ------------------------------- ----- (Address of Principal Executive Offices) (Zip Code) Registrant's telephone number, including area code: (617) 621-9350 -------------- ITEM 1. CHANGES IN CONTROL OF REGISTRANT Not applicable. ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS Not applicable. ITEM 3. BANKRUPTCY OR RECEIVERSHIP Not applicable. ITEM 4. CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT Not applicable. ITEM 5. OTHER EVENTS On October 14, 1999, LeukoSite, Inc. ("LeukoSite") issued a press release (which is attached hereto as an Exhibit) announcing that it had signed an Agreement and Plan of Merger with Millennium Pharmaceuticals, Inc. ("Millennium") and ANM, Inc., a wholly owned subsidiary of Millennium (the "LeukoSite Merger Agreement"), pursuant to which LeukoSite will become a wholly owned subsidiary of Millennium. ITEM 6. RESIGNATION OF REGISTRANT'S DIRECTORS Not applicable. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS (a) Financial Statements of Businesses Acquired. Not applicable. (b) Pro Forma Financial Information. Not applicable. (c) Exhibits. Item 601(a) of Regulation S-K Exhibit No. Description - ----------- ----------- 99.1 Press release announcing the signing of the LeukoSite Merger Agreement, dated October 14, 1999. 99.2 Agreement and Plan of Merger, dated October 14, 1999, by and among Millennium, ANM, Inc. and LeukoSite. ITEM 8. CHANGE IN FISCAL YEAR Not applicable. ITEM 9. SALES OF EQUITY SECURITIES PURSUANT TO REGULATION S Not applicable. 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. LEUKOSITE, INC. (Registrant) By: /s/ Augustine Lawlor ------------------------------------- Augustine Lawlor, Vice President, Corporate Development and Chief Financial Officer Dated: October 20, 1999 INDEX TO EXHIBITS Exhibit No. Description - ----------- ----------- 99.1 Press release announcing the signing of the LeukoSite Merger Agreement, dated October 14, 1999. 99.2 Agreement and Plan of Merger, dated October 14, 1999, by and among Millennium, ANM, Inc. and LeukoSite.