Alkermes plc (ALKS) ownership: Top institutional holder: BlackRock, Inc. ($1.00B). Insider activity: Net Seller (1 buys, 19 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 28314410.00 | $1.00B | 2026-03-31 |
| VANGUARD GROUP INC | 18007364.00 | $503.85M | 2025-12-31 |
| BAKER BROS. ADVISORS LP | 10012267.00 | $354.03M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 9511112.00 | $336.31M | 2026-03-31 |
| STATE STREET CORP | 9465286.00 | $334.69M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 7427397.00 | $262.63M | 2026-03-31 |
| RENAISSANCE TECHNOLOGIES LLC | 6160428.00 | $217.83M | 2026-03-31 |
| AMERICAN CENTURY COMPANIES INC | 6072103.00 | $214.71M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-04 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-05-29 | |
| Sell | null | 2026-05-29 | |
| Sell | null | 2026-05-29 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.