Alkermes plc.
ALKS- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001520262
In the last 90 days, Alkermes plc. insiders filed 0 open-market purchases and 8 sales; 425 institutions reported holding it in 13F filings for Q2 2026, worth $9.32B in total; no superinvestor holds it.
Holders of 5% or more of ALKS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Alkermes plc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 15.80%25.6M shares | – | Apr 28, 20251 filing | Apr 28, 2025 | SEC |
| Baker Bros. Advisors LP | 13G | 6.10%10.0M shares | New | Feb 17, 20261 filing | Feb 17, 2026 | SEC |
| Vanguard Portfolio Management LLC | 13G | 5.80%9.65M shares | New | Apr 28, 20261 filing | Apr 28, 2026 | SEC |
| Vanguard Capital Management LLC | 13G | 5.21%8.68M shares | New | Apr 28, 20261 filing | Apr 28, 2026 | SEC |
| State Street Corp | 13G | 5.20%8.54M shares | +0.30 ppfrom 4.90% | May 13, 20252 filings | Nov 10, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
13 Schedule 13D and 13G filings on Alkermes plc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 15, 202610:07 AM ET | Price T Rowe Associates Inc | 13G/A | 2.80%4.66M shares | −3.30 ppfrom 6.10%Below 5% | Mar 31, 2026 | SEC |
| Apr 28, 20262:46 PM ET | Vanguard Portfolio Management LLC | 13G | 5.80%9.65M shares | New | Mar 31, 2026 | SEC |
| Apr 28, 202611:17 AM ET | Vanguard Capital Management LLC | 13G | 5.21%8.68M shares | New | Mar 31, 2026 | SEC |
| Mar 26, 20261:06 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Feb 17, 20264:25 PM ET | Baker Bros. Advisors LPand 3 others | 13G | 6.10%10.0M shares | New | Dec 31, 2025 | SEC |
| Nov 10, 20258:14 AM ET | State Street Corp | 13G | 5.20%8.54M shares | +0.30 ppfrom 4.90% | Sep 30, 2025 | SEC |
| Aug 14, 20251:07 PM ET | Price T Rowe Associates Inc | 13G/A | 6.10%10.0M shares | – | Jun 30, 2025 | SEC |
| May 13, 202510:23 AM ET | State Street Corp | 13G | 4.90%8.02M shares | NewBelow 5% | Mar 31, 2025 | SEC |
| Apr 28, 20259:00 AM ET | BlackRock, Inc. | 13G/A | 15.80%25.6M shares | – | Mar 31, 2025 | SEC |
| Feb 10, 202510:25 AM ET | Wellington Management Group LLPand 2 others | 13G/A | 4.30%7.01M shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 16, 2021 | Price T Rowe Associates Inc | 13G/AOld format | – | – | – | SEC |
| Feb 10, 2021 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Feb 3, 2021 | Wellington Management Group LLP | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Alkermes plc. shares.
No Form 144 notices for Alkermes plc. are on file.