X0202 3 2006-10-17 0 0001298521 Trubion Pharmaceuticals, Inc TRBN 0001365618 Hove Anders D C/O VENROCK ASSOCIATES 30 ROCKEFELLER PLAZA, ROOM 5508 NEW YORK NY 10112 1 0 1 0 Series B Preferred Stock Common Stock 302527 I By Fund Series B Preferred Stock Common Stock 1483474 I By Fund Series B Preferred Stock Common Stock 36450 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. Anders D. Hove is a Member of Venrock Partners Management, LLC and disclaims beneficial ownership of these securities except to the extent of his pro-rata interest. Securities held of record by Venrock Associates IV, L.P., a limited partnership of which Venrock Management IV, LLC is the General Partner. Anders D. Hove is a Member of Venrock Management IV, LLC and disclaims beneficial ownership of these securities except to the extent of his pro-rata interest. Securities held of record by Venrock Entrepreneurs Fund IV, L.P., a limited partnership of which VEF Management IV, LLC is the General Partner. Anders D. Hove is a Member of VEF Management IV, LLC and disclaims beneficial ownership of these securities except to the extent of his pro-rata interest. Anders D. Hove 2006-10-17