SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549-1004 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OF THE SECURITIES EXCHANGE ACT OF 1934 DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED): OCTOBER 30, 2000 CIPHERGEN BIOSYSTEMS, INC. (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) DELAWARE 000-31617 33-059-5156 (STATE OR OTHER JURISDICTION OF (COMMISSION FILE NUMBER) (I.R.S. EMPLOYER INCORPORATION OR ORGANIZATION) IDENTIFICATION NUMBER) 6611 DUMBARTON CIRCLE FREMONT, CA 94555 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (510) 505-2100 (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE) ITEM 5. OTHER EVENTS On October 30, 2000, Ciphergen Biosystems, Inc. issued a press release announcing that Ciphergen Biosystems, Inc. was filing an amended complaint in its lawsuit against Molecular Analytical Systems, Inc. and LumiCyte, Inc. The press release is attached as Exhibit 99.1 to this Form 8-K. On October 30, 2000, Molecular Analytical Systems, Inc. and LumiCyte, Inc. filed a cross complaint against Ciphergen Biosystems, Inc. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS (c) Exhibits. EXHIBIT NUMBER DESCRIPTION - ------------ ----------------------------------------------------------------- 99.1 Ciphergen Biosystems, Inc. Press Release issued October 30, 2000. 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. CIPHERGEN BIOSYSTEMS, INC. (Registrant) Date: November 8, 2000 BY: /s/ William E. Rich ------------------------------------- William E. Rich President and Chief Executive Officer -2- EXHIBIT INDEX EXHIBIT NUMBER DESCRIPTION - ------------ ----------------------------------------------------------------- 99.1 Ciphergen Biosystems, Inc. Press Release, issued October 30, 2000 -3-