X0306 4 2022-10-03 0 0001708493 Harpoon Therapeutics, Inc. HARP 0001701440 Walker Luke Nathaniel C/O HARPOON THERAPEUTICS, INC. 131 OYSTER POINT BOULEVARD, SUITE 300 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Medical Officer Employee Stock Option (right to buy) 1.08 2022-10-03 4 A 0 305000 0.00 A 2032-10-02 Common Stock 305000 305000 D The stock option was granted pursuant to the Issuer's 2022 Inducement Plan. 1/4th of the total stock option will vest and become exercisable on the first anniversary of the vesting commencement date of October 3, 2022 ("VCD"), and 1/36th of the remaining stock option will vest and become exercisable monthly on the same day of each month following the VCD, subject to the continued service of the Reporting Person on each vesting date. /s/ Frank J. Lanza, Attorney-in-Fact 2022-10-04