Amphastar Pharmaceuticals, Inc. — Director's Dealing 2017

May 12, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2017-05-11

Reporting Person: PRINS RICHARD K (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-11	Common Stock	M	7500	$10.77	Acquired	30500	Direct
2017-05-11	Common Stock	S	7500	$15.43	Disposed	23000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-11	Stock Option (right to buy)	$10.77	M	7500	Disposed	2017-12-15	Common Stock (7500)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.41 to $15.435, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

F2: Shares subject to the option are fully vested and immediately exercisable.