FORM 4
[ X ] 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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Watkins Thomas 		2. Issuer Name and Ticker or Trading Symbol

Horizon Pharma plc [ HZNP ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O HORIZON PHARMA, INC., 520 EAST COOK ROAD, SUITE 520 		3. Date of Earliest Transaction (MM/DD/YYYY)

9/19/2014
(Street)

DEERFIELD, IL 60015
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Stock Option (Right to Buy)   $12.29   9/19/2014     D   (1)       40000      (2) 4/14/2024   Common Stock   40000     (3) 0   D    
Stock Option (Right to Buy)   $15.96   9/19/2014     D   (1)       20000      (4) 6/26/2024   Common Stock   20000     (3) 0   D    

Explanation of Responses:
( 1)  Disposition in connection with the merger (the "Merger") contemplated by the Transaction Agreement and Plan of Merger among Horizon Pharma, Inc. (the "Issuer"), Vidara Therapeutics Holdings LLC, Horizon Pharma plc (formerly known as Vidara Therapeutics International Ltd.), Hamilton Holdings (USA), Inc. and Hamilton Merger Sub, Inc. Pursuant to the Merger, the outstanding securities of the Issuer are being canceled and automatically converted into securities of Horizon Pharma plc. The Reporting Person's acquisition of securities of Horizon Pharma plc in the Merger will be reported on a separate Form 4.
( 2)  The stock option vested in 12 equal monthly installments following the grant date of 4/15/2014.
( 3)  In connection with the Merger, the stock option has been assumed and converted into options to purchase the same number of ordinary shares of Horizon Pharma plc at the same exercise price and on substantially the same terms.
( 4)  The stock option vests in 12 equal monthly installments following the grant date of 6/27/2014.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Watkins Thomas
C/O HORIZON PHARMA, INC.
520 EAST COOK ROAD, SUITE 520
DEERFIELD, IL 60015 		X



Signatures
/s/ Robert J. De Vaere, Attorney-in-Fact 9/22/2014
** 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 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).
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 control number.
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