X0202 3 2006-10-17 0 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001305240 Venrock Partners Management, LLC 30 ROCKEFELLER PLAZA, ROOM 5508 NEW YORK NY 10112 0 0 1 0 Series B Preferred Stock Common Stock 302527 I By Fund 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. Securities held of record by Venrock Partners, L.P., a limited partnership of which Venrock Partners Management, LLC is the General Partner. Venrock Partners Management, LLC disclaims beneficial ownership of these securities except to the extent of its pro-rata interest. Anders D. Hove, Member 2006-10-17