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 *
  Brown Iain Michael
 2. Date of Event Requiring Statement (Month/Day/Year)
05/28/2015		 3. Issuer Name and Ticker or Trading Symbol
Alkermes plc. [ALKS]
(Last)
(First)
(Middle)
852 WINTER STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP, Finance & CAO
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WALTHAM, MA 02451		 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)
Ordinary Shares 36,428
D
 

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)   (1) 12/09/2015 Ordinary Shares 17,000 $ 18.6 D  
Employee Stock Option (Right to Buy)   (1) 05/02/2016 Ordinary Shares 8,500 $ 20.79 D  
Employee Stock Option (Right to Buy)   (1) 05/17/2020 Ordinary Shares 6,250 $ 11.74 D  
Employee Stock Option (Right to Buy)   (1) 05/20/2021 Ordinary Shares 35,000 $ 18.105 D  
Employee Stock Option (Right to Buy) 05/21/2013(2) 05/21/2022 Ordinary Shares 40,000 $ 16.55 D  
Restricted Stock Unit Award 05/21/2013(3)   (3) Ordinary Shares 2,125 $ 0 D  
Employee Stock Option (Right to Buy) 05/28/2014(4) 05/28/2023 Ordinary Shares 30,000 $ 33.72 D  
Restricted Stock Unit Award 05/28/2014(5)   (5) Ordinary Shares 5,250 $ 0 D  
Employee Stock Option (Right to Buy) 03/03/2015(6) 03/03/2024 Ordinary Shares 25,000 $ 47.16 D  
Restricted Stock Unit Award 03/03/2015(7)   (7) Ordinary Shares 3,750 $ 0 D  
Employee Stock Option (Right to Buy) 02/26/2016(8) 02/26/2025 Ordinary Shares 17,750 $ 71.23 D  
Restricted Stock Unit Award 02/26/2016(9)   (9) Ordinary Shares 4,400 $ 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Brown Iain Michael
852 WINTER STREET
WALTHAM, MA 02451		       VP, Finance & CAO  

Signatures

/s/ Jennifer Baptiste, attorney-in-fact for Iain M. Brown 05/29/2015
**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) These options are fully vested in accordance with their terms.
(2) Shares subject to the stock option award vest in four equal annual installments commencing on 5/21/13.
(3) Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/21/13.
(4) Shares subject to the stock option award vest in four equal annual installments commencing on 5/28/14.
(5) Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/28/14.
(6) Shares subject to the stock option award vest in four equal annual installments commencing on 3/3/15.
(7) Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing 3/3/2015.
(8) Shares subject to the stock option award vest in four equal annual installments commencing on 2/26/2016.
(9) Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing 2/26/2016.

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