X0306 4 2020-05-27 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 2020-05-27 4 S 0 12064 22.3926 D 2560295 I See Footnote Common stock 2020-05-28 4 S 0 366591 21.3342 D 2193704 I See Footnote Represents the weighted average sales price per share. These shares were sold in multiple transactions at prices ranging from $22.00 to $24.00 per share, inclusive. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission (the "SEC"), the Issuer, or a security holder of the Issuer. 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. Represents the weighted average sales price per share. These shares were sold in multiple transactions at prices ranging from $21.25 to $22.00 per share, inclusive. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the SEC, the Issuer, or a security holder of the Issuer. Arix Bioscience Plc, by: /s/ Marcus Karia, Authorized Officer 2020-05-29 Arix Bioscience Holdings Limited, by: /s/ Marcus Karia, Authorized Officer 2020-05-29