Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
Avalon Ventures IX, L.P.
   2. Issuer Name and Ticker or Trading Symbol
ARATANA THERAPEUTICS, INC. [PETX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
1134 KLINE STREET		 3. Date of Earliest Transaction (Month/Day/Year)
07/02/2013
(Street)

LA JOLLA, CA 92037		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 07/02/2013   C   2,406,739 A (1) 2,642,668 (2) D  
Common Stock 07/02/2013   C   802,246 A (1) 3,444,914 D  
Common Stock 07/02/2013   C   225,631 A (1) 3,670,545 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A Convertible Preferred Stock $ 1.662 (1) 07/02/2013   C     4,000,000   (3)   (4) Common Stock 2,406,739 $ 0 0 D  
Series B Convertible Preferred Stock $ 4.986 (1) 07/02/2013   C     1,333,333   (3)   (4) Common Stock 802,246 $ 0 0 D  
Series C Convertible Perferred Stock $ 6.648 (1) 07/02/2013   C     375,000   (3)   (4) Common Stock 225,631 $ 0 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Avalon Ventures IX, L.P.
1134 KLINE STREET
LA JOLLA, CA 92037		     X    
Avalon Ventures IX GP, LLC
1134 KLINE STREET
LA JOLLA, CA 92037		     X    

Signatures

 Avalon Ventures IX, LP, /s/ Douglas Downs, Douglas Downs, Authorized Signatory   07/05/2013
**Signature of Reporting Person Date
 Avalon Ventures IX GP, LLC, /s/ Douglas Downs, Douglas Downs, Authorized Signatory   07/05/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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) Each share of Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock automatically converted into 0.6016847 of a share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. The shares had no expiration date.
(2) Immediately prior to the closing of the Issuer's initial public offering, the Issuer issued 235,929 shares of its Common Stock to the holders of its Series A, B and C Preferred Stock in satisfaction of accumulated and unpaid dividends.
(3) Immediately.
(4) Not applicable.
 
Remarks:
Avalon Ventures IX, LP holds of record and thereby beneficially owns and has sole direct power to vote and dispose of 5,708,333 shares of Convertible Preferred Stock, which were automatically converted into 3,670,545 shares of Common Stock upon the closing of the Issuer's initial public offering. Avalon Ventures IX GP, LLC, in its capacity as the general partner of Avalon Ventures IX, LP, may be deemed to be the beneficial owner of the shares of the Issuer owned by Avalon Ventures IX, LP, as in its capacity as the general partner, it has the power to dispose, direct the disposition of, and vote the shares of the Issuer owned by Avalon Ventures IX, LP. Each of Avalon Ventures IX, LP and Avalon Ventures IX GP, LLC and their respective affiliates disclaim beneficial ownership of all shares of the Issuer in which they do not have a pecuniary interest

Name and Address of Other Reporting Persons:

Avalon Ventures IX GP, LLC
1134 Kline Street
La Jolla, CA 92037

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