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): December 21, 2007 COUGAR BIOTECHNOLOGY, INC. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of incorporation) 000-51473 20-2903204 (Commission File Number) (IRS Employer Identification No.) 10990 Wilshire Blvd, Suite 1200 Los Angeles, CA 90024 (Address of principal executive offices) (Zip Code) (310) 943-8040 (Registrant's telephone number, including area code) N/A (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: [_] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [_] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [_] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [_] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Item 8.01. Other Events. (a) Closing of Private Placement On December 14, 2007, Cougar Biotechnology, Inc. (the "Company") entered into a securities purchase agreement (the "Purchase Agreement") with various institutional investors relating to the sale in a private placement of an aggregate of 3,000,000 shares of its common stock at a price of $29.00 per share, the terms of which were disclosed by the Company in a Current Report on Form 8-K filed with the Securities and Exchange Commission on December 17, 2007. On December 21, 2007, the Company completed the sale of the shares as contemplated under the Purchase Agreement. (b) Initiation of Phase I Trial for CB3304 On December 21, 2007, the Company issued a press release relating to the enrollment of the first patient in a Phase I trial of the Company's drug candidate CB3304 (noscapine). A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits. (d) Exhibits. 99.1 Press Release dated December 21, 2007. 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. COUGAR BIOTECHNOLOGY, INC. Date: December 21, 2007 By: /s/ Charles R. Eyler -------------------------------------- Charles R. Eyler Treasurer and Vice President, Finance 2 INDEX TO EXHIBITS FILED WITH THIS REPORT Ex. No. Description - ------- ----------- 99.1 Press Release dated December 21, 2007.