Amphastar Pharmaceuticals, Inc. — Director's Dealing 2015

May 30, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2015-05-27

Reporting Person: Petersen Floyd F. (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-27	Common Stock	A	8686	—	Acquired	50298	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-27	Stock Option (right to buy)	$15.11	A	47782	Acquired	2020-05-27	Common Stock (47782)	Direct

Footnotes

F1: The reported securities are represented by deferred stock units, or DSUs, all of which vest on May 27, 2016.

F2: All of the shares subject to the option vest on May 27, 2016.