Amphastar Pharmaceuticals, Inc. — Director's Dealing 2015

Mar 30, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2014-07-07

Reporting Person: Purchase Marilyn J. (Corp. Exec. VP of Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-07-07	Common Stock	F	1239	$8.75	Disposed	31375	Direct
2014-10-03	Common Stock	F	519	$11.41	Disposed	30856	Direct
2015-03-26	Common Stock	A	14046	—	Acquired	44902	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-03-26	Employee Stock Option (right to buy)	$14.95	A	42054	Acquired	2025-03-26	Common Stock (42054)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	16044	Indirect

Footnotes

F1: The reported securities were withheld to satisfy the Reporting Person's tax liability in connection with the vesting of deferred stock units (DSUs).

F2: Excludes 16,044 shares previously reported as held directly.

F3: The reported securities are represented by DSUs which vest in four equal annual installments beginning on March 26, 2016.

F4: All of the reported shares were previously reported as held directly.

F5: The shares are held directly by the Purchase Family Trust for which the Reporting Person serves as co-trustee.

F6: Shares subject to the option vest in four equal annual installments beginning on March 26, 2016.