X0306 4 2022-01-28 0 0001708493 Harpoon Therapeutics, Inc. HARP 0001557930 Erbez Georgia C/O HARPOON THERAPEUTICS, INC. 131 OYSTER POINT BOULEVARD, SUITE 300 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Financial Officer Employee Stock Option (right to buy) 5.03 2022-01-28 4 A 0 115000 0.00 A 2032-01-27 Common Stock 115000 115000 D 1/48th of the total stock option will vest and become exercisable monthly on the same day of each month following the vesting commencement date of January 28, 2022, subject to the continuing employment of the Reporting Person on each vesting date. /s/ Georgia Erbez by Laura Berezin, Attorney-in-Fact 2022-02-01