Amphastar Pharmaceuticals, Inc. — Director's Dealing 2021

May 18, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2020-05-13

Reporting Person: Zhou Rong (EVP, Production Center)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-13	Common Stock	M	700	$14.23	Acquired	96965	Direct
2021-05-13	Common Stock	S	700	$19.58	Disposed	96265	Direct
2021-05-14	Common Stock	M	11120	$14.23	Acquired	107385	Direct
2021-05-14	Common Stock	S	17419	$19.7178	Disposed	89966	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-13	Employee Stock Option (right to buy)	$14.23	M	700	Disposed	2021-12-22	Common Stock (700)	Direct
2021-05-14	Employee Stock Option (right to buy)	$14.23	M	11120	Disposed	2021-12-22	Common Stock (11120)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	99668	Indirect
Common Stock	5000	Indirect

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.58 to $19.88, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

F2: The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.

F3: The shares are held of record by the reporting person's spouse.

F4: Shares subject to the option are fully vested and immediately exercisable.