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 * BLOOM FLOYD E   2. Issuer Name and Ticker or Trading Symbol Alkermes plc. [ALKS] 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) TREASURY BUILDING, LOWER GRAND CANAL STREET 3. Date of Earliest Transaction (Month/Day/Year) 09/16/2011 (Street) DUBLIN 2  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 Common Stock 09/16/2011   A   90,281 A (1) 90,281 D   Common Stock 09/16/2011   A   9,028 A (1) 9,028 I Floyd E Bloom Charitable Remainder Trust Common Stock 09/16/2011   A   21,066 A (1) 21,066 I Jody Corey-Bloom Charitable Remainder Trust

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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
Non Qualified Stock Option (Right to Buy)	$ 7.19	09/16/2011		A		20,000		(2)	09/18/2012	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 13.44	09/16/2011		A		20,000		(2)	09/09/2013	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 11.84	09/16/2011		A		20,000		(2)	09/23/2014	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 16.77	09/16/2011		A		20,000		(2)	09/23/2015	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 14.04	09/16/2011		A		20,000		(2)	09/21/2016	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 18.29	09/16/2011		A		20,000		(2)	10/09/2017	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 11.44	09/16/2011		A		20,000		(2)	10/07/2018	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 8.98	09/16/2011		A		20,000		(2)	10/06/2019	Common Stock	20,000	(3)	20,000	D
Non Qualified Stock Option (Right to Buy)	$ 14.92	09/16/2011		A		20,000		(2)	10/05/2020	Common Stock	20,000	(3)	20,000	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BLOOM FLOYD E TREASURY BUILDING LOWER GRAND CANAL STREET DUBLIN 2	X

Signatures

/s/ Jennifer Baptiste, attorney-in-fact for Floyd Bloom		09/20/2011
**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)	Received in exchange for shares of Alkermes, Inc. common stock in connection with the merger of Alkermes, Inc. and the global drug delivery technologies business of Elan (the "Merger"). On 9/16/11, the effective date of the Merger, the closing price of ALKS was $16.57 per share.
(2)	These options are fully vested in accordance with their terms.
(3)	Received in exchange for, and having substantially the same terms as, stock options of Alkermes, Inc. common stock in connection with the Merger.

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