Amphastar Pharmaceuticals, Inc. — Director's Dealing 2015

Jun 10, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2015-03-27

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
2015-03-27	Common Stock	F	20877	$15.43	Disposed	911636	Direct
2015-06-05	Common Stock	M	48980	$12.97	Acquired	960616	Direct
2015-06-05	Common Stock	S	44149	$16.4642	Disposed	916467	Direct
2015-06-08	Common Stock	M	30066	$12.97	Acquired	946533	Direct
2015-06-08	Common Stock	S	27020	$16.614	Disposed	919513	Direct
2015-06-09	Common Stock	M	28324	$12.97	Acquired	947837	Direct
2015-06-09	Common Stock	S	25700	$16.2356	Disposed	922137	Direct
2015-03-27	Common Stock	F	8641	$15.43	Disposed	661666	Indirect
2015-06-05	Common Stock	M	50162	$12.97	Acquired	711828	Indirect
2015-06-05	Common Stock	S	43989	$16.4657	Disposed	667839	Indirect
2015-06-08	Common Stock	M	30152	$12.97	Acquired	697991	Indirect
2015-06-08	Common Stock	S	27100	$16.6087	Disposed	670891	Indirect
2015-06-09	Common Stock	M	28433	$12.97	Acquired	699324	Indirect
2015-06-09	Common Stock	S	25800	$16.1229	Disposed	673524	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-06-05	Employee Stock Option (right to buy)	$12.97	M	48980	Disposed	2015-09-28	Common Stock (48980)	Direct
2015-06-08	Employee Stock Option (right to buy)	$12.97	M	30066	Disposed	2015-09-28	Common Stock (30066)	Direct
2015-06-09	Employee Stock Option (right to buy)	$12.97	M	28324	Disposed	2015-09-28	Common Stock (28324)	Direct
2015-06-05	Employee Stock Option (right to buy)	$12.97	M	50162	Disposed	2015-09-28	Common Stock (50162)	Indirect
2015-06-08	Employee Stock Option (right to buy)	$12.97	M	30152	Disposed	2015-09-28	Common Stock (30152)	Indirect
2015-06-09	Employee Stock Option (right to buy)	$12.97	M	28433	Disposed	2015-09-28	Common Stock (28433)	Indirect

Holdings (Non-Derivative)

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

F3: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.28 to $16.5015, 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 (3), (4), (5), (7), (8) and (9) to this Form 4.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.41 to $16.85, inclusive.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.50 to $16.595, inclusive.

F6: The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.

F7: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.28 to $16.52, inclusive.

F8: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.41 to $16.825, inclusive.

F9: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.00 to $16.595, inclusive.

F10: The shares are held of record by Applied Physics & Chemistry Laboratories, Inc., of which the reporting persons are the sole owners.

F11: 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.

F12: 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.

F13: Shares subject to the option are fully vested and immediately exercisable.