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 *
  Hasnain Faheem
 2. Date of Event Requiring Statement (Month/Day/Year)
05/15/2013		 3. Issuer Name and Ticker or Trading Symbol
AMBIT BIOSCIENCES CORP [AMBI]
(Last)
(First)
(Middle)
C/O AMBIT BIOSCIENCES CORPORATION, 11080 ROSELLE STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN DIEGO, CA 92121		 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)

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
Stock Option (Right to Buy)   (1) 09/30/2020 Common Stock 62 $ 1,680 D  
Stock Option (Right to Buy)   (2) 08/17/2021 Common Stock 517 $ 600 D  
Stock Option (Right to Buy)   (2) 08/17/2021 Common Stock 258 $ 600 D  
Stock Option (Right to Buy)   (3) 12/12/2022 Common Stock 144,259 $ 6 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Hasnain Faheem
C/O AMBIT BIOSCIENCES CORPORATION
11080 ROSELLE STREET
SAN DIEGO, CA 92121		   X      

Signatures

/s/ Faheem Hasnain 05/15/2013
**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) 25% of the shares subject to the option vest on October 1, 2011; thereafter 1/48th of the shares subject to the option vest each month following October 1, 2011, so that all of the shares subject to the option shall be vested October 1, 2014.
(2) 1/36th of the shares subject to the option shall vest each month following April 1, 2011, so that all of the shares subject to the option shall be vested 3 years after April 1, 2011.
(3) 1/48th of the shares subject to the option vest monthly beginning on December 1, 2012.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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