Amphastar Pharmaceuticals, Inc. — Director's Dealing 2016

Feb 4, 2016

SEC Form 4/A — Form 4/A

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2015-06-10

Reporting Person: Zhang Jack Y. (Director, CEO & Chief Science Officer, 10% Owner)
Reporting Person: Luo Mary Z. (Director, COO, Chief Scientist, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-06-10	Common Stock	M	12975	$12.97	Acquired	935112	Direct
2015-06-10	Common Stock	S	11731	$16.3792	Disposed	923381	Direct
2015-06-11	Common Stock	M	12860	$12.97	Acquired	936241	Direct
2015-06-11	Common Stock	S	11600	$16.4694	Disposed	924641	Direct
2015-06-12	Common Stock	M	83253	$12.97	Acquired	1007894	Direct
2015-06-12	Common Stock	S	75618	$16.1487	Disposed	932276	Direct
2015-06-10	Common Stock	M	12619	$12.97	Acquired	686143	Indirect
2015-06-10	Common Stock	S	11411	$16.3719	Disposed	674732	Indirect
2015-06-11	Common Stock	M	12930	$12.97	Acquired	687662	Indirect
2015-06-11	Common Stock	S	11664	$16.4689	Disposed	675998	Indirect
2015-06-12	Common Stock	M	42223	$12.97	Acquired	718221	Indirect
2015-06-12	Common Stock	S	38471	$16.1673	Disposed	679750	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-06-10	Employee Stock Option (right to buy)	$12.97	M	12975	Disposed	2015-09-28	Common Stock (12975)	Direct
2015-06-11	Employee Stock Option (right to buy)	$12.97	M	12860	Disposed	2015-09-28	Common Stock (12860)	Direct
2015-06-12	Employee Stock Option (right to buy)	$12.97	M	83253	Disposed	2015-09-28	Common Stock (83253)	Direct
2015-06-10	Employee Stock Option (right to buy)	$12.97	M	12619	Disposed	2015-09-28	Common Stock (12619)	Indirect
2015-06-11	Employee Stock Option (right to buy)	$12.97	M	12930	Disposed	2015-09-28	Common Stock (12930)	Indirect
2015-06-12	Employee Stock Option (right to buy)	$12.97	M	42223	Disposed	2015-09-28	Common Stock (42223)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	7631594	Indirect
Common Stock	5000	Indirect
Common Stock	200000	Indirect

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the each of the reporting persons on December 16, 2014.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.25 to $16.61, inclusive. The reporting persons undertake 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 within the ranges set forth in footnotes (2), (3), (4), (6), (7) and (8) to this Form 4.

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.38 to $16.62, inclusive.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.02 to $16.49, inclusive.

F5: The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.

F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.24 to $16.55, inclusive.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.37 to $16.61, inclusive.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.03 to $16.39, inclusive.

F9: The shares are held of record by Applied Physics & Chemistry Laboratories, Inc., of which the reporting persons are the sole owners.

F10: The shares are held of record in an account for the benefit of the reporting persons' son. The reporting persons disclaims beneficial ownership of these shares, and the inclusion of these shares in this report should not be deemed an admission of beneficial ownership of any such shares for purposes of Section 16, or for any other purpose.

F11: The shares are held of record by a trust for the benefit of the reporting persons' son. The reporting persons disclaims beneficial ownership of these shares, and the inclusion of these shares in this report should not be deemed an admission of beneficial ownership of any such shares for purposes of Section 16, or for any other purpose.

F12: Shares subject to the option are fully vested and immediately exercisable.