Amphastar Pharmaceuticals, Inc. — Director's Dealing 2026

Mar 17, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2026-03-15

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
2026-03-15	Common Stock	F	9784	$18.18	Disposed	2990052	Direct
2026-03-15	Common Stock	F	2908	$18.18	Disposed	1245125	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	6827679	Indirect

Footnotes

F1: The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.

F2: The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.

F3: 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.