Amphastar Pharmaceuticals, Inc. — Director's Dealing 2023

May 23, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2023-05-18

Reporting Person: PETERS WILLIAM J (Director, CFO, EVP & Treasurer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2023-05-18	Common Stock	M	10500	$13.35	Acquired	115648	Direct
2023-05-18	Common Stock	S	10500	$44.35	Disposed	105148	Direct
2023-05-19	Common Stock	F	378	$44.16	Disposed	104770	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-05-18	Employee Stock Option (right to buy)	$13.35	M	10500	Disposed	2027-03-16	Common Stock (10500)	Direct

Footnotes

F1: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2022.

F2: The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.

F3: Shares subject to the option are fully vested and immediately exercisable.