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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
1235598	M James Frates	Treasury Building Lower Grand Canal Street Dublin 2 Ireland	Svp & Cfo, Alkermes Plc	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	Explanation
Common Stock	Acquisiton	2012-02-21	5,000	$4.77	84,625	No	4	M	Direct
Common Stock	Disposition	2012-02-21	5,000	$18.25	79,625	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non Qualified Stock Option (Right to Buy)	Disposition	2012-02-21	5,000	$0.00	0	$4.77

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
12,296		2012-07-18	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,000	Indirect	By Sons

Footnotes

This option exercise was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
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 $18.06 to $18.43. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.
These options are fully vested in accordance with their terms.