Alkermes plc. — Director's Dealing 2013

Jan 4, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-01-04

Reporting Person: Ehrich Elliot (SVP, R&D & CMO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-01-04	Ordinary Shares	M	520	$14.90	Acquired	28400	Direct
2013-01-04	Ordinary Shares	M	70980	$14.90	Acquired	99380	Direct
2013-01-04	Ordinary Shares	S	71500	$20.0001	Disposed	27880	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-01-04	Incentive Stock Option (Right to Buy)	$14.90	M	520	Disposed	2014-12-17	Ordinary Shares (520)	Direct
2013-01-04	Non Qualified Stock Option (Right to Buy)	$14.90	M	70980	Disposed	2014-12-17	Ordinary Shares (70980)	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 $20.00 to $20.0025. 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.