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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1520262	Alkermes Plc.	ALKS	Pharmaceutical Preparations (2834)	981007018

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1555260	Rebecca Peterson	852 Winter St. Waltham MA 02451	Svp, Corporate Communications	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Ordinary Shares	Acquisiton	2013-05-21	2,500	$0.00	2,500	No	4	M	Direct
Ordinary Shares	Disposition	2013-05-21	816	$31.98	1,684	No	4	F	Direct
Ordinary Shares	Disposition	2013-05-22	1,684	$32.50	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Ordinary Shares	Restricted Stock Unit Award	Disposition	2013-05-21	2,500	$0.00	2,500	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
7,500	2013-05-21		No	4	M	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.49 to $32.51. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.
Shares subject to the restricted stock unit award vest in equal annual installments over a four year period, commencing on 5/21/13.