Alkermes PLC Schedule 13G passive stakes

T. Rowe Price Associates, Inc. has filed a Schedule 13G, reporting beneficial ownership of 4,664,563 shares of Alkermes PLC common stock, representing 2.8% of the class.

Vanguard Portfolio Management has reported beneficial ownership of 5.8% of Alkermes PLC's common stock as of March 31, 2026.

Vanguard Capital Management has reported beneficial ownership of 8,676,888 shares, representing 5.21% of Alkermes PLC's common stock as of March 31, 2026.

The Vanguard Group has filed an amendment to its Schedule 13G, reporting zero beneficial ownership in Alkermes PLC following an internal realignment.

State Street Corporation has reported a 5.2% passive beneficial ownership stake in Alkermes PLC, holding 8,540,351 shares as of September 30, 2025.

T. Rowe Price Associates, Inc. has reported a 6.1% beneficial ownership stake in Alkermes PLC, holding over 10 million common shares.

State Street Corporation has filed a Schedule 13G, reporting a 4.9% passive beneficial ownership stake in Alkermes PLC.

BlackRock, Inc. has filed an amended Schedule 13G, reporting a 15.8% passive beneficial ownership stake in Alkermes plc as of March 31, 2025.

Wellington Management Group LLP and its affiliates have filed an amended Schedule 13G, reporting a 4.3% beneficial ownership stake in Alkermes Public Limited Company as of December 31, 2024.