X0306 4 2022-06-22 0 0001708493 Harpoon Therapeutics, Inc. HARP 0001201039 BAILES JOSEPH S C/O HARPOON THERAPEUTICS, INC. 131 OYSTER POINT BOULEVARD, SUITE 300 SOUTH SAN FRANCISCO CA 94080 1 0 0 0 Director Stock Option (Right to Buy) 2.01 2022-06-22 4 A 0 10167 0.00 A 2032-06-21 Common Stock 10167 10167 D Director Stock Option (Right to Buy) 2.01 2022-06-22 4 A 0 31428 1.40 A 2032-06-21 Common Stock 31428 31428 D The stock option will fully vest and become exercisable on June 21, 2023, subject to the continuous service of the Reporting Person with the Issuer on such date. This option was issued to the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Policy in lieu of retainer fees of $44,000 ("Election Option"). One-half of the Election Option vested and became exercisable on June 22, 2022, and 25% of each Election Option will vest and become exercisable on each of September 30, 2022 and December 31, 2022, subject to the continuous service of the Reporting Person with the Issuer through each vesting date. /s/ Joseph S. Bailes by Georgia Erbez, Attorney-in-Fact 2022-06-24