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

Role: EVP CORP ADMIN CENTER, Director
Signature: /s/ Eva Wen, by power of attorney
Issuer symbol: AMPH
Transactions as of: 10 Mar 2025
Net transactions value: $0
Form type: 4
Filing time: 12 Mar 2025, 16:16:00 UTC
Previous filing: 10 Mar 2025
Next filing: 18 Mar 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMPH	Common Stock	Award	$0	+20,837	+29%	$0.000000	93,671	10 Mar 2025	Direct	F1
holding	AMPH	Common Stock						2,459	10 Mar 2025	See footnote	F2

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	+44,253		$0.000000	44,253	10 Mar 2025	Common Stock	44,253	$28.41	Direct	F3

* 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 reported shares are held of record by the Yakob and Sunmoon Trust dated July 25, 2013 for which the reporting person serves as a trustee.
F3	The shares subject to the option vest in four equal annual installments beginning on March 10, 2026.