SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 __________ FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 OF THE SECURITIES EXCHANGE ACT OF 1934 February 1, 2006 __________ Commission File Number: 000-50825 __________ GPC BIOTECH AG (Exact name of registrant as specified in its Charter) __________ Fraunhoferstrasse 20 D-82152 Martinsried/Munich, Germany Tel: 011 49 89 8565 2600 (Address of registrant's principal executive offices) __________ Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. Form 20-F X Form 40-F --- ---- Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): Yes No X --- -- Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): Yes No X --- -- Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. Yes No X --- -- If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- N/A --- MARTINSRIED/MUNICH (GERMANY), WALTHAM, MASS. AND PRINCETON, N.J., FEBRUARY 1, 2007 - GPC Biotech AG reported yesterday, January 31, 2007, in accordance with Sec. 26 para. 1 of the German Securities Trading Act (WpHG) that it received notifications by Mr. Dietmar Hopp, Mr. Oliver Hopp, Mr. Berthold Wipfler, BW Verwaltungs GmbH, DH-Capital GmbH & Co.KG and OH Beteiligungen GmbH & Co.KG that their ownership of voting shares of GPC Biotech fell below 10% (in the case of Mr. Dietmar Hopp) and 5% (in all other cases). A full copy of the announcement is attached as Exhibit 1 to this Form 6-K. The reductions in ownership are a result of certain share loans provided by DH-Capital GmbH & Co.KG and OH Beteiligungen GmbH & Co.KG to the underwriter in connection with GPC Biotech AG's private placement announced on January 24, 2007. The loan is expected to be returned in September 2007. INDEX - ----- Exhibit 1 Announcement acc. to Sec. 26 para.l WpHG. 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, thereto duly authorized. Date: February 1, 2007 GPC BIOTECH AG By: /s/ Bernd Seizinger --------------------------------- Name: Bernd Seizinger, M.D., Ph.D. Title: President and CEO By: /s/ Mirko Scherer --------------------------------- Name: Mirko Scherer, Ph.D. Title Senior Vice President and CFO