Alkermes plc. — Director's Dealing 2012

Jan 25, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-01-24

Reporting Person: Pugh Gordon G (SVP, COO & CRO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-01-24	Common Stock	M	15000	$8.55	Acquired	41002	Direct
2012-01-24	Common Stock	S	15000	$17.6522	Disposed	26002	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-01-24	Employee Stock Option (Right to Buy)	$8.55	M	15000	Disposed	2019-05-26	Common Stock (15000)	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 $17.56 to $17.75. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: 2,500 currently vested, remainder vests in 2 equal annual installments beginning on 5/26/12.