Alkermes plc. — Director's Dealing 2012

Feb 23, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-02-22

Reporting Person: HENWOOD GERALDINE (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-22	Common Stock	M	20000	$9.91	Acquired	20000	Direct
2012-02-22	Common Stock	S	20000	$17.2864	Disposed	0	Direct
2012-02-22	Common Stock	M	8000	$9.91	Acquired	8000	Direct
2012-02-22	Common Stock	S	8000	$17.2864	Disposed	0	Direct
2012-02-22	Common Stock	M	18400	$8.98	Acquired	18400	Direct
2012-02-22	Common Stock	S	18400	$17.2864	Disposed	0	Direct
2012-02-23	Common Stock	M	1600	$8.98	Acquired	1600	Direct
2012-02-23	Common Stock	S	1600	$17.3147	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-22	Non Qualified Stock Option (Right to Buy)	$9.91	M	20000	Disposed	2013-04-24	Common Stock (20000)	Direct
2012-02-22	Non Qualified Stock Option (Right to Buy)	$9.91	M	8000	Disposed	2013-04-24	Common Stock (8000)	Direct
2012-02-22	Non Qualified Stock Option (Right to Buy)	$8.98	M	18400	Disposed	2019-10-06	Common Stock (18400)	Direct
2012-02-23	Non Qualified Stock Option (Right to Buy)	$8.98	M	1600	Disposed	2019-10-06	Common Stock (1600)	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $17.11 to $17.425. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F2: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $17.20 to $17.44. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F3: These options are fully vested in accordance with their terms.