ALKERMES PLC

Ticker: ALKS CUSIP: G01767105 Class: Common Stock

Rock Springs Capital Management LP's Holding History (CIK: 0001595725)

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

Q4 2025

Shares 139,228 Value ($000) $3,896 Avg Close $29.95 Range $27.49 - $36.32

Q3 2025

Shares 106,537 Value ($000) $3,196 Avg Close $28.20 Range $25.17 - $31.69

Q2 2017

Shares 52,000 Value ($000) $3,014 Avg Close $58.09 Range $53.64 - $63.40

Q1 2017

Shares 125,000 Value ($000) $7,313 Avg Close $56.71 Range $51.08 - $62.50

Q4 2016

Shares 125,000 Value ($000) $6,948 Avg Close $53.46 Range $41.93 - $60.74

Q3 2016

Shares 183,027 Value ($000) $8,608 Avg Close $47.55 Range $43.26 - $52.27

Q2 2016

Shares 194,500 Value ($000) $8,406 Avg Close $41.26 Range $33.31 - $47.90

Q1 2016

Shares 194,500 Value ($000) $6,650 Avg Close $39.49 Range $27.14 - $78.88

Q2 2014

Shares 41,250 Value ($000) $2,076 Avg Close $46.12 Range $40.30 - $51.81

Q1 2014

Shares 35,500 Value ($000) $1,565 Avg Close $47.58 Range $39.68 - $54.25

Q4 2013

Shares 23,250 Value ($000) $945 Avg Close $36.93 Range $29.36 - $41.47

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	139,228	$3,896	$29.95	$27.49 - $36.32
Q3 2025	106,537	$3,196	$28.20	$25.17 - $31.69
Q2 2017	52,000	$3,014	$58.09	$53.64 - $63.40
Q1 2017	125,000	$7,313	$56.71	$51.08 - $62.50
Q4 2016	125,000	$6,948	$53.46	$41.93 - $60.74
Q3 2016	183,027	$8,608	$47.55	$43.26 - $52.27
Q2 2016	194,500	$8,406	$41.26	$33.31 - $47.90
Q1 2016	194,500	$6,650	$39.49	$27.14 - $78.88
Q2 2014	41,250	$2,076	$46.12	$40.30 - $51.81
Q1 2014	35,500	$1,565	$47.58	$39.68 - $54.25
Q4 2013	23,250	$945	$36.93	$29.36 - $41.47