X0303 4 2009-09-23 1 0000822206 IDM PHARMA, INC. IDMI 0001444357 PALO ALTO HEALTHCARE MASTER FUND, L.P. C/O CITCO FUND SERVICES (BERMUDA) LTD. WASHINGTON MALL WEST, 2ND FL., 7 REID ST HAMILTON D0 HM 11 BERMUDA 0 0 1 0 0001444356 PALO ALTO HEALTHCARE FUND, L.P. 470 UNIVERSITY AVENUE PALO ALTO CA 94301 0 0 1 0 Common Stock 2009-09-23 4 U 0 2931029 2.64 D 0 D Warrants (Right to buy) 3.243 2009-09-23 4 C 0 265256 D 2007-02-21 2012-02-20 Common Stock 265256 0 D Warrants (Right to buy) 4.06 2009-09-24 4 C 0 116315 D 2007-06-25 2012-06-25 Common Stock 116315 0 D Palo Alto Healthcare Master Fund, L.P. (the "Master Fund") held these securities directly on behalf of its investors. Palo Alto Healthcare Fund, L.P. is a limited partner in the Master Fund and, as such, indirectly held a portion of the Common Stock and Warrants reported on this Form 4 on behalf of its investors. The Warrants held by the Master Fund were terminated in exchange for a cash payment equal to the Black-Scholes Value of such Warrants, calculated pursuant to the terms of such Warrants. Palo Alto Healthcare Master Fund, L.P., by Palo Alto Investors, LLC, General Partner, by Palo Alto Investors, Manager, by Mark Shamia, Chief Operating Officer 2009-06-24 Palo Alto Healthcare Fund, L.P., by Palo Alto Investors, LLC, General Partner, by Palo Alto Investors, Manager, by Mark Shamia, Chief Operating Officer 2009-06-24