Alkermes plc. — Director's Dealing 2012

Oct 9, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2012-10-08

Reporting Person: POPS RICHARD F (Director, Director and CEO, Alkermes plc)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-10-08	Ordinary Shares	M	58100	$7.36	Acquired	406273	Direct
2012-10-08	Ordinary Shares	S	58100	$20.5746	Disposed	348173	Direct
2012-10-09	Ordinary Shares	M	41900	$7.36	Acquired	390073	Direct
2012-10-09	Ordinary Shares	S	41900	$20.3088	Disposed	348173	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-10-08	Non Qualified Stock Option (Right to Buy)	$7.36	M	58100	Disposed	2012-12-12	Ordinary Shares (58100)	Direct
2012-10-09	Non Qualified Stock Option (Right to Buy)	$7.36	M	41900	Disposed	2012-12-12	Ordinary Shares (41900)	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 $20.43 to $20.73. 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 $20.07 to $20.62. 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.