Rong Zhou - Mar 10, 2025 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Role: SENIOR EVP, PRODUCTION CENTER
Signature: /s/ Eva Wen, by power of attorney
Stock symbol: AMPH
Transactions as of: Mar 10, 2025
Transactions value $: $0
Form type: 4
Date filed: 3/12/2025, 04:53 PM
Previous filing: Mar 10, 2025
Next filing: Mar 18, 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMPH	Common Srock	Award	$0	+24.7K	+21.29%	$0.00	141K	Mar 10, 2025	Direct	F1
holding	AMPH	Common Stock						99.7K	Mar 10, 2025	See footnote	F2
holding	AMPH	Common Stock						5K	Mar 10, 2025	See footnote	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AMPH	Employee Stock Option (right to buy)	Award	$0	+52.4K		$0.00	52.4K	Mar 10, 2025	Common Stock	52.4K	$28.41	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The reported shares are represented by restricted stock units, or RSUs, which vest in four equal annual installments beginning on March 10, 2026.
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	The shares subject to the option vest in four equal annual installments beginning on March 10, 2026.