X0508 4 2023-11-26 0 0001708493 Harpoon Therapeutics, Inc. HARP 0001624055 Lanza Frank J C/O HARPOON THERAPEUTICS, INC. 611 GATEWAY BOULEVARD, SUITE 400 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Principal Fin. & Acctng Ofc. 0 Common Stock 2023-11-26 4 A 0 2000 0.00 A 3362 D Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock, issuable upon the vesting and settlement of RSUs. 25% of the RSUs will vest on each May 26th and November 26th of 2024 and 2025, subject to acceleration and vesting in full upon a Change in Control (as defined in the Issuer's 2019 Equity Incentive Plan) of the Issuer, and subject to the continuing employment of the Reporting Person on each vesting date. Includes 30 shares acquired under the Issuer's employee stock purchase plan on September 30, 2022, 232 shares acquired on March 31, 2023, and 445 shares acquired on September 29, 2023. Shares reflect 1:10 reverse stock split effective September 1, 2023. /s/ Frank J. Lanza 2023-11-28