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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1297184	Amphastar Pharmaceuticals Inc.	AMPH	Pharmaceutical Preparations (2834)	330702205

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1645326	Rong Zhou	C/O Amphastar Pharmaceuticals, Inc. 11570 6Th Street Rancho Cucamonga CA 91730	Evp, Production Center	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2019-05-06	9,600	$20.26	66,707	No	4	M	Direct
Common Stock	Disposition	2019-05-06	9,600	$22.76	57,107	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2019-05-06	9,600	$0.00	9,600	$20.26

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2019-08-05	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	99,668	Indirect	See footnote
Common Stock	5,000	Indirect	See footnote

Footnotes

The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 15, 2018.
The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.
The shares are held of record by the reporting person's spouse.
Shares subject to the option are fully vested and immediately exercisable.
On March 4, 2019, an amendment on Form 4 (the "Amendment") was filed to reflect an adjustment of 3,200 shares to the amount of derivative securities beneficially owned following the reported transaction on Form 4 filed on February 7, 2019 (the "Original Form 4"). The Amendment was filed in error as the balance on the Original Form 4 was reported correctly. The error was carried forward in a subsequent Form 4 filed on March 4, 2019. The total reported in Column 9 of Table II has been adjusted to correct the understatement of total holdings by 3,200 shares reflected in the Amendment and the Original Form 4.