X0303 4 2010-01-29 0 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001429594 Mohler Kendall 2401 4TH AVE., SUITE 1050 SEATTLE WA 98121 0 1 0 0 SVP & Chief Scientific Officer Employee Stock Option (right to buy) 3.82 2010-01-29 4 A 0 45000 0.00 A 2020-01-29 Common Stcok 45000 45000 D Vests at the rate of 1/48th on February 1, 2010, and 1/48th monthly thereafter, such that all of the shares will be fully vested as of January 1, 2014, subject, however to the reporting person's continuing provision of service to the issuer on such vesting dates. /s/ Michelle Burris, Attorney-in-fact 2010-02-01