X0202 4/A 2006-10-31 2007-01-10 0 0001335102 Cougar Biotechnology, Inc. NONE 0001296549 Belldegrun Arie UCLA SCHOOL OF MEDICINE, 10833 LE CONTE 66-118 CHS BOX 951738 LOS ANGELES CA 90095-1738 1 0 0 0 Common Stock, $.0001 par value 2006-10-31 4 J 0 1111 0 A 12213 I By Trust Common Stock, $.0001 par value 2006-12-14 4 J 0 1111 0 A 13324 I By Trust Common Stock, $.0001 par value 2006-10-31 4 J 0 1676 0 A 18427 I By Trust Common Stock, $.0001 par value 2006-12-14 4 J 0 1676 0 A 20103 I By Trust Common Stock, $.0001 par value 2006-12-29 4 A 0 18864 0 A 18864 D Series A Convertible Preferred Stock 2006-04-03 2016-03-09 Common Stock, $.0001 par value 99913 99913 I By Trust Series A Convertible Preferred Stock 2006-04-03 2016-03-09 Common Stock, $.0001 par value 150755 150755 I By Trust Warrant 8.28 2005-06-30 2010-06-30 Common Stock, $.0001 par value 35699 35699 I By Trust Stock Options (right to buy) 0.3905 2006-04-03 2014-01-01 Common Stock, $.0001 par value 153644 153644 D Stock Options (right to buy) 4.8163 2006-04-03 2016-02-27 Common Stock, $.0001 par value 90650 90650 D Stock Options (right to buy) 4.5039 2006-04-03 2016-03-09 Common Stock, $.0001 par value 161326 161326 D Stock Options (right to buy) 4.50 2016-06-28 Common Stock, $.0001 par value 30000 30000 D Stock Options (right to buy) 4.50 2016-09-06 Common Stock, $.0001 par value 200000 200000 D Stock Options (right to buy) 0.3905 2006-12-29 4 D 0 38411 0 D 2006-04-03 2014-08-24 Common Stock, $.0001 par value 38411 0 D Stock Options (right to buy) 2.60 2006-12-29 4 A 0 38411 0 A 2006-12-29 2014-08-24 Common Stock, $.0001 par value 38411 38411 D Shares issued in connection with certain penalty clauses in connection with a private placement of securities. Held by a trust of which the Reporting Person is a beneficiary. Held by a Trust for the benefit of the Reporting Person's children, of which the Reporting Person's spouse is the Trustee. The Series A Convertible Preferred Stock ("Series A") is convertible on a one-for-one basis with no additional consideration. However, pursuant to the Issuer's Certificate of Designation, the Reporting Person can convert the Series A only in the event or to the extent that such conversion would not cause the reporting Person to beneficially hold in excess of 9.99%. 10,000 shares vest on each of 6/28/07, 6/28/08 and 6/28/09. Pursuant to Rule 16b-3. Options vest as follows: 66,667 shares each on 9/6/07 and 9/6/08; and 66,666 shares on 9/6/09. Option cancelled and regranted with an adjusted exercise price to reflect the fair market value on the original date of grant, in accordance with IRS Section 409A transition regulations. /s/ Arie Belldegrun 2007-01-25