X0202 3 2006-10-17 0 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001305246 Venrock Entrepreneurs Fund IV, L.P. 30 ROCKEFELLER PLAZA, ROOM 5508 NEW YORK NY 10112 0 0 1 0 Series B Preferred Stock Common Stock 36450 D Shares of Preferred Stock are convertible into Common Stock at any time and have no expiration date. All outstanding shares of Preferred Stock will automatically convert into shares of Common Stock upon the closing of the Issuer's initial public offering. Each share of Series B Preferred Stock will automatically convert into Common Stock on a 1-for-1 basis. Anders D. Hove, Member of VEF Management IV, LLC, the General Partner of Venrock Entrepreneurs Fund IV, L.P. 2006-10-17