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 *
FRATES JAMES M
   2. Issuer Name and Ticker or Trading Symbol
Alkermes plc. [ALKS] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP & CFO, Alkermes plc
(Last)
(First)
(Middle)
CONNAUGHT HOUSE, 1 BURLINGTON ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
11/13/2012
(Street)

DUBLIN 4 IRELAND 		 4. If Amendment, Date Original Filed(Month/Day/Year)
 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 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
Ordinary Shares 11/13/2012   M   8,750 A $ 9.97 94,842 D  
Ordinary Shares 11/13/2012   F   4,320 D $ 20.19 90,522 D  
Ordinary Shares 11/13/2012   M   8,726 A $ 7.36 99,248 D  
Ordinary Shares 11/13/2012   F   3,180 D $ 20.19 96,068 D  
Ordinary Shares 11/14/2012   M(1)   5,364 A $ 7.36 101,432 D  
Ordinary Shares 11/14/2012   S(2)   5,364 D $ 20.1461 (3) 96,068 D  
Ordinary Shares               4,000 I By Sons

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
Incentive Stock Option (Right to Buy) $ 9.97 11/13/2012   M     8,750   (4) 04/25/2013 Ordinary Shares 8,750 $ 0 0 D  
Incentive Stock Option (Right to Buy) $ 7.36 11/13/2012   M     8,726   (4) 12/12/2012 Ordinary Shares 8,726 $ 0 0 D  
Non Qualified Stock Option (Right to Buy) $ 7.36 11/14/2012   M(1)     5,364   (4) 12/12/2012 Ordinary Shares 5,364 $ 0 13,730 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
FRATES JAMES M
CONNAUGHT HOUSE
1 BURLINGTON ROAD
DUBLIN 4 IRELAND 		       SVP & CFO, Alkermes plc  

Signatures

 /s/ Jennifer Baptiste, attorney-in-fact for James M. Frates   11/15/2012
**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) This option exercise was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
(2) This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
(3) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $20.00 to $20.24. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.
(4) These options are fully vested in accordance with their terms.

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