X0306 4 2019-02-12 0 0001708493 Harpoon Therapeutics, Inc. HARP 0001700449 Arix Bioscience plc 20 BERKELEY SQUARE MAYFAIR, LONDON X0 W1J 6EQ UNITED KINGDOM 0 0 1 0 0001756884 Arix Bioscience Holdings Ltd 20 BERKELEY SQUARE MAYFAIR, LONDON X0 W1J 6EQ UNITED KINGDOM 0 0 1 0 Common stock 2019-02-12 4 C 0 2463548 A 2463548 I See Footnote Common stock 2019-02-12 4 P 0 428571 14.00 A 2892119 I See Footnote Series B Convertible Preferred Stock 2019-02-12 4 C 0 1720698 0.00 D Common Stock 1720698 0 I See Footnote Series C Convertible Preferred Stock 2019-02-12 4 C 0 742850 0.00 D Common Stock 742850 0 I See Footnote The Series B Convertible Preferred Stock and the Series C Convertible Preferred Stock converted into Harpoon Therapeutics, Inc. (the "Issuer") common stock, on a one-for-one basis, effective upon closing of the Issuer's initial public offering. These shares are owned directly by Arix Bioscience Holdings Limited, which is a wholly owned subsidiary of Arix Bioscience Plc. Arix Bioscience Plc is an indirect beneficial owner of the reported securities and disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein. Arix Bioscience Plc, by: /s/ James Rawlingson, Authorized Officer 2019-02-14 Arix Bioscience Holdings Limited, by: /s/ James Rawlingson, Authorized Officer 2019-02-14