SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Zhou Rong

(Last)

(First)

(Middle)

C/O AMPHASTAR PHARMACEUTICALS, INC.

11570 6TH STREET

(Street)

RANCHO CUCAMONGA

91730

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/09/2015

3. Issuer Name and Ticker or Trading Symbol
Amphastar Pharmaceuticals, Inc. [ AMPH ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP, Production

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	25,688⁽¹⁾	D
Common Stock	99,668	I	See footnote⁽²⁾
Common Stock	5,000	I	See footnote⁽³⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee stock option (right to buy)	⁽⁴⁾	12/21/2016	Common Stock	12,000	$30.57	D
Employee stock option (right to buy)	⁽⁴⁾	12/30/2017	Common Stock	24,000	$31.65	D
Employee stock option (right to buy)	⁽⁴⁾	08/28/2018	Common Stock	16,000	$35.32	D
Employee stock option (right to buy)	⁽⁴⁾	08/05/2019	Common Stock	16,000	$20.26	D
Employee stock option (right to buy)	⁽⁵⁾	03/08/2021	Common Stock	20,000	$11.41	D
Employee stock option (right to buy)	⁽⁶⁾	12/22/2021	Common Stock	20,000	$14.23	D
Employee stock option (right to buy)	⁽⁷⁾	11/07/2022	Common Stock	25,000	$10.48	D
Employee stock option (right to buy)	⁽⁸⁾	07/30/2023	Common Stock	28,000	$10.93	D
Employee stock option (right to buy)	⁽⁹⁾	04/14/2024	Common Stock	32,891	$14.4	D
Employee stock option (right to buy)	⁽¹⁰⁾	03/26/2025	Common Stock	18,524	$14.95	D

Explanation of Responses:

1. Includes 6,187 shares represented by deferred stock units, or DSUs, which vest in four equal annual installments beginning on March 26, 2016.

2. The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.

3. The shares are held of record by the reporting person's spouse.

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

5. Shares subject to the option vest in five equal annual installments beginning on March 8, 2012.

6. Shares subject to the option vest in four equal annual installments beginning on December 22, 2012.

7. Shares subject to the option vest in four equal annual installments beginning on November 7, 2013.

8. Shares subject to the option vest in four equal annual installments beginning on July 30, 2014.

9. Shares subject to the option vest in four equal annual installments beginning on April 14, 2015.

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

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Ken Stupak, by power of attorney	06/17/2015
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.