Joanne L. Viney - May 4, 2021 Form 4/A - Amendment Insider Report for Harpoon Therapeutics, Inc. (HARP)

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	HARP	Director Stock Option (Right to Buy)	Award	$0	+10.2K		$0.00	10.2K	May 4, 2021	Common Stock	10.2K	$23.20	Direct	F1, F2
transaction	HARP	Director Stock Option (Right to Buy)	Award	$0	+2.57K		$0.00	2.57K	May 4, 2021	Common Stock	2.57K	$23.20	Direct	F3, F4, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	This option was erroneously reported with a price of $22.50 on the original Form 4 filed on May 7, 2021 due to an administrative error.
F2	The stock option will fully vest and become exercisable on May 3, 2022, subject to the continuous service of the Reporting Person with the Issuer on such date. The original Form 4 filed on May 7, 2021 erroneously reported this vesting date as May 4, 2022.
F3	This option was erroneously reported with a price of $22.50 on the original Form 4 filed on May 7, 2021 due to an administrative error related to the calculation date of the Black-Scholes value.
F4	The number of shares underlying the option was erroneously reported as 2,653 on the original Form 4 filed on May 7, 2021 due to an administrative error related to the calculation date of the Black-Scholes value.
F5	50% of the shares subject to the option are fully vested and exercisable, and 25% will vest and become exercisable on September 30, 2021 and December 31, 2021, subject to the continuous service of the Reporting Person on each vesting date.