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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
1379941	Howard Lee	C/O Amphastar Pharmaceuticals, Inc. 11570 6Th Street Rancho Cucamonga CA 91730		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2020-05-22	10,000	$15.11	138,081	No	4	M	Direct
Common Stock	Disposition	2020-05-22	10,000	$18.36	128,081	No	4	S	Direct
Common Stock	Acquisiton	2020-05-26	10,000	$15.11	138,081	No	4	M	Direct
Common Stock	Disposition	2020-05-26	10,000	$18.60	128,081	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
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	Stock Option (right to buy)	Disposition	2020-05-22	10,000	$0.00	10,000	$15.11
Common Stock	Stock Option (right to buy)	Disposition	2020-05-26	10,000	$0.00	10,000	$15.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,000		2020-05-27	No	4	M	Direct
0		2020-05-27	No	4	M	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.05 to $18.59 shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.
The price reported in Column 4 is weighted average price. These shares were sold in multiple transactions at prices ranging from $18.42 to $18.94, inclusive.
Shares subject to the option are fully vested and immediately exercisable.