Ownership Submission
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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Zhou Rong
 2. Date of Event Requiring Statement (Month/Day/Year)
06/09/2015		 3. Issuer Name and Ticker or Trading Symbol
Amphastar Pharmaceuticals, Inc. [AMPH]
(Last)
(First)
(Middle)
C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET		 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 Original Filed(Month/Day/Year)
(Street)

RANCHO CUCAMONGA, CA 91730		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
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  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Zhou Rong
C/O AMPHASTAR PHARMACEUTICALS, INC.
11570 6TH STREET
RANCHO CUCAMONGA, CA 91730		       EVP, Production  

Signatures

/s/ Ken Stupak, by power of attorney 06/17/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(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

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