EcoR1 Capital’s Alkermes ALKS Stock Holding History

EcoR1 Capital’s Portfolio ALKS Stock Details ALKS Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-500,000	Closed	-$15M	–	31
2025 Q3	$15M	Hold	500,000	–	–	0.72%	19
2025 Q2	$14.3M	Buy	+500,000	New	+$14.9M	0.85%	22

Other funds holding ALKS

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

BBA

Baker Bros. Advisors New York $20B AUM 154.41% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

EcoR1 Capital's ALKS Position: Q4 2025 in Review

EcoR1 Capital sold out of Alkermes (ALKS) in Q4 2025, closing a stake of 500,000 shares — an estimated $15M sold.

EcoR1 Capital first reported a position in ALKS in Q2 2025 and held it in 2 quarters. The position peaked at $15M in Q3 2025. 366 funds tracked by Wall St. Rank hold ALKS as of Q4 2025.

EcoR1 Capital reported no remaining Alkermes position as of Q4 2025 after selling out during the quarter.
EcoR1 Capital sold 500,000 Alkermes shares in Q4 2025, an estimated $15M.
EcoR1 Capital first reported a position in Alkermes in Q2 2025 and held it in 2 quarters.
EcoR1 Capital's Alkermes position peaked at $15M in Q3 2025.
366 funds tracked by Wall St. Rank held Alkermes as of Q4 2025.

Based on EcoR1 Capital's 13F filing for Q4 2025, filed 17 Feb 2026.