Alkermes plc. — Director's Dealing 2013

Nov 19, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2013-11-18

Reporting Person: Peterson Rebecca (SVP, Corporate Communications)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-11-18	Ordinary Shares	M	3750	$9.21	Acquired	3750	Direct
2013-11-18	Ordinary Shares	S	3750	$38.2053	Disposed	0	Direct
2013-11-18	Ordinary Shares	M	1875	—	Acquired	1875	Direct
2013-11-18	Ordinary Shares	F	886	$36.89	Disposed	989	Direct
2013-11-19	Ordinary Shares	S	989	$36.7103	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-11-18	Employee Stock Option (Right to Buy)	$9.21	M	3750	Disposed	2019-11-18	Ordinary Shares (3750)	Direct
2013-11-18	Restricted Stock Unit Award	$0	M	1875	Disposed		Ordinary Shares (1875)	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 $38.20 to $38.24. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F4: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $36.71 to $36.72. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

F5: These options are fully vested in accordance with their terms.

F6: This award is fully vested in accordance with its terms.