X0202 4 2006-10-17 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001162060 SCHNELL DAVID 435 TASSO STREET SUITE 200 PALO ALTO CA 94301 1 0 0 0 Common Stock 2006-10-17 4 C 0 1795112 A 1795112 I By Proespect Venture Partners II, L.P. Common Stock 2006-10-17 4 C 0 27338 A 27338 I By Prospect Associates II, L.P. Common Stock 2006-10-17 4 P 0 34653 13 A 1829765 I By Prospect Venture Partners II, L.P. Common Stock 2006-10-17 4 P 0 528 13 A 27866 I By Prospect Associates II, L.P. Series B Convertible Preferred 2006-10-17 4 C 0 1795112 0 D 2006-10-17 2006-10-17 Common Stock 1795112 1795112 I By Prospect Venture Partners II, L.P. Series B Convertible Preferred 2006-10-17 4 C 0 27338 0 D 2006-10-17 2006-10-17 Common Stock 27338 27338 I By Prospect Associates II, L.P. Each share of Series B Convertible Preferred Stock converted automatically into shares of Common Stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering and had no expiration date. The shares are owned by Prospect Venture Partners II, L.P. ("PVP II"). Prospect Management Co. II, L.L.C. ("PMC II") serves as the sole general partner of PVP II. James B. Tananbaum, M.D., Alexander E. Barkas, Ph.D., David Schnell, M.D., and Russell C. Hirsch, M.D., Ph.D. are the Managing Directors of PMC II. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of its pecuniary interest. The shares are owned by Prospect Associates II, L.P. ("PA II"). PMC II serves as the sole general partner of PA II. James B. Tananbaum, M.D., Alexander E. Barkas, Ph.D., David Schnell, M.D., and Russell C. Hirsch, M.D., Ph.D. are the Managing Directors of PMC II. The reporting person disclaims beneficial ownership of the shares reported herein, except to the extent of its pecuniary interest. These securities were automatically converted into Common Stock on a 1-for-1 basis upon the closing of the Issuer's initial public offering. Not applicable. /s/ Dave Markland, Power of Attorney for David Schnell 2006-10-19