Rong Zhou - 15 Mar 2022 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Role: EVP, Production Center
Signature: /s/ Eva Wen, by power of attorney
Issuer symbol: AMPH
Transactions as of: 15 Mar 2022
Net transactions value: -$57,390
Form type: 4
Filing time: 17 Mar 2022, 17:07:24 UTC
Previous filing: 01 Mar 2022
Next filing: 18 Mar 2022
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	+13,658	+19%	$0.000000	83,965	15 Mar 2022	Direct	F1
transaction	AMPH	Common Stock	Tax liability	$57,390	-1,652	-2%	$34.74	82,313	15 Mar 2022	Direct	F2
holding	AMPH	Common Stock						99,668	15 Mar 2022	See footnote	F3
holding	AMPH	Common Stock						5,000	15 Mar 2022	See footnote	F4

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	+31,516		$0.000000	31,516	15 Mar 2022	Common Stock	31,516	$34.74	Direct	F5

* 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 15, 2023.
F2	The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs.
F3	The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.
F4	The shares are held of record by the reporting person's spouse.
F5	The shares subject to the option vest in four equal annual installments beginning on March 15, 2023.