ALKERMES PLC

Ticker: ALKS CUSIP: G01767105 Class: Common Stock

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

Note: Option positions (PUT/CALL) are excluded.

Q1 2015

Shares 17,500 Value ($000) $1,067 Avg Close $68.32 Range $57.31 - $75.17

Q3 2014

Shares 55,000 Value ($000) $2,358 Avg Close $44.82 Range $41.02 - $52.50

Q2 2014

Shares 4,000 Value ($000) $201 Avg Close $46.12 Range $40.30 - $51.81

Q2 2013

Shares 11,000 Value ($000) $315 Avg Close $29.15 Range $22.17 - $34.30

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	17,500	$1,067	$68.32	$57.31 - $75.17
Q3 2014	55,000	$2,358	$44.82	$41.02 - $52.50
Q2 2014	4,000	$201	$46.12	$40.30 - $51.81
Q2 2013	11,000	$315	$29.15	$22.17 - $34.30