Amphastar Pharmaceuticals, Inc. — Director's Dealing 2025

Jun 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2025-06-02

Reporting Person: Petersen Floyd F. (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-06-02	Common Stock	S	500	$25.6701	Disposed	72909	Direct
2025-06-02	Common Stock	A	5122	—	Acquired	78031	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-06-02	Stock Option (right to buy)	$25.38	A	11402	Acquired	2035-06-02	Common Stock (11402)	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 November 26, 2024.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.39 to $25.97, 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.

F3: The reported shares are represented by restricted stock units, or RSUs, all of which vest on June 2, 2026.

F4: All of the shares subject to the option vest on June 2, 2026.