Amphastar Pharmaceuticals, Inc. — Director's Dealing 2025

Jun 16, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2025-06-13

Reporting Person: Zhang Jack Y. (N/A)
Reporting Person: Luo Mary Z. (Director, COO, Chief Scientist, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-06-13	Common Stock	M	200000	$13.03	Acquired	2847659	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-06-13	Employee Stock Option (right to buy)	$13.03	M	200000	Disposed	2028-03-16	Common Stock (200000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1185475	Indirect
Common Stock	6827679	Indirect

Footnotes

F1: The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.

F2: The shares are held of record by Applied Physics and Chemistry Laboratories, Inc., of which the reporting persons and The Bill Luobei Zhang 2004 Irrevocable Trust are the sole owners.

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