Alkermes plc. — Director's Dealing 2012

Feb 3, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-02-01

Reporting Person: POPS RICHARD F (Director, Director and CEO, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-01	Common Stock	M	35000	$7.36	Acquired	375682	Direct
2012-02-01	Common Stock	S	35000	$18.8332	Disposed	340682	Direct
2012-02-01	Common Stock	M	4032	$4.77	Acquired	344714	Direct
2012-02-01	Common Stock	S	4032	$18.8332	Disposed	340682	Direct
2012-02-01	Common Stock	M	20968	$4.77	Acquired	361650	Direct
2012-02-01	Common Stock	S	20968	$18.8332	Disposed	340682	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-01	Non Qualified Stock Option (Right to Buy)	$7.36	M	35000	Disposed	2012-12-12	Common Stock (35000)	Direct
2012-02-01	Non Qualified Stock Option (Right to Buy)	$4.77	M	4032	Disposed	2012-07-18	Common Stock (4032)	Direct
2012-02-01	Incentive Stock Option (Right to Buy)	$4.77	M	20968	Disposed	2012-07-18	Common Stock (20968)	Direct

Footnotes

F1: This option exercise was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $18.63 to $19.07. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: These options are fully vested in accordance with their terms.