Amphastar Pharmaceuticals, Inc. — Director's Dealing 2016

Sep 22, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Amphastar Pharmaceuticals, Inc. (AMPH)
CIK: 0001297184
Period of Report: 2016-09-20

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
2016-09-20	Common Stock	M	207350	$16.753	Acquired	1295685	Direct
2016-09-20	Common Stock	S	76152	$20.727	Disposed	1219533	Direct
2016-09-20	Common Stock	S	131198	$21.3291	Disposed	1088335	Direct
2016-09-21	Common Stock	M	55081	$16.753	Acquired	1143416	Direct
2016-09-21	Common Stock	S	54581	$20.696	Disposed	1088835	Direct
2016-09-21	Common Stock	S	500	$21.452	Disposed	1088335	Direct
2016-09-20	Common Stock	M	181768	$16.753	Acquired	934089	Indirect
2016-09-20	Common Stock	S	86555	$20.7387	Disposed	847534	Indirect
2016-09-20	Common Stock	S	95213	$21.3279	Disposed	752321	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-09-20	Employee Stock Option (right to buy)	$16.753	M	207350	Disposed	2016-10-03	Common Stock (207350)	Direct
2016-09-21	Employee Stock Option (right to buy)	$16.753	M	55081	Disposed	2016-10-03	Common Stock (55081)	Direct
2016-09-20	Employee Stock Option (right to buy)	$16.753	M	181768	Disposed	2016-10-03	Common Stock (181768)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	7461594	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 reporting person on June 15, 2016.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.08 to $21.07 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) and (5) 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 $21.08 to $21.53, inclusive.

F4: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.21 to $21.17, inclusive.

F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.26 to $21.50, inclusive.

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

F7: The shares are held of record by APCL, of which the reporting persons are the sole owners.

F8: The shares are held of record in an account for the benefit of the reporting persons' son. The reporting persons disclaim 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.

F9: The shares are held of record by a trust for the benefit of the reporting persons' son. The reporting persons disclaim 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.

F10: Shares subject to the option are fully vested and immediately exercisable.