Alkermes plc. — Director's Dealing 2011

Sep 20, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2011-09-16

Reporting Person: MITCHELL PAUL J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-09-16	Common Stock	A	8000	—	Acquired	8000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-09-16	Non Qualified Stock Option (Right to Buy)	$8.98	A	20000	Acquired	2019-10-06	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$9.91	A	20000	Acquired	2013-04-24	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$9.91	A	8000	Acquired	2013-04-24	Common Stock (8000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$11.44	A	20000	Acquired	2018-10-07	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$11.84	A	20000	Acquired	2014-09-23	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$13.44	A	20000	Acquired	2013-09-09	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$14.04	A	20000	Acquired	2016-09-21	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$16.77	A	20000	Acquired	2015-09-23	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$18.29	A	20000	Acquired	2017-10-09	Common Stock (20000)	Direct
2011-09-16	Non Qualified Stock Option (Right to Buy)	$14.92	A	20000	Acquired	2020-10-05	Common Stock (20000)	Direct

Footnotes

F1: These options are fully vested in accordance with their terms.

F2: Received in exchange for, and having substantially the same terms as, stock options of Alkermes, Inc. common stock in connection with the Merger.

F3: 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.