X0303 4 2009-05-27 0 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001162060 SCHNELL DAVID C/O PROSPECT VENTURE PARTNERS 435 TASSO STREET, SUITE 200 PALO ALTO CA 94301 1 0 0 1 Indirect 10% owner Common Stock 1829765 I By Prospect Venture Partners II, L.P. Common Stock 27866 I By Prospect Associates II, L.P. Stock option (right to purchase) 2.28 2009-05-27 4 A 0 5000 0.00 A 2019-05-27 Common Stock 5000 5000 D Prospect Management Co. II, LLC, of which the reporting person is one of the managing directors, is the sole general partner of Prospect Venture Partners II, L.P. The reporting person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. Prospect Management Co. II, LLC, of which the reporting person is one of the managing directors, is the sole general partner of Prospect Associates II, L.P. The reporting person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. Option vests 100% on May 26, 2010, subject to the individual's provision of service to the issuer on such date. /s/ Kathleen Deeley as attorney-in-fact for David Schnell 2009-05-28