AlkermesALKS
13F holders, Q1 2026 (March 31)390holders +24
64new positions
45sold out
7famous investors
$35.20avg. 13F price*
At the end of Q1 2026, 390 institutions reported holding Alkermes PLC (ALKS) in their 13F filings, up 24 from Q4 2025. 64 opened new positions and 45 sold out. The largest holders were BlackRock, Inc. ($1.0B), Baker Bros. Advisors LP ($354.0M) and Vanguard Portfolio Management LLC ($336.3M). 7 famous investors held it, including Jim Simons / Peter Brown (0.3% of Renaissance Technologies's portfolio), Ken Griffin (0.1% of Citadel Advisors's portfolio) and David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio).
- Company
- Alkermes PLC
- CUSIP
- G01767105
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 64 | $299.8M |
| Exits | 45 | $107.9M |
All 13F filers, Q4 2025 → Q1 2026: 18,682,487 shares bought and 20,362,664 shares sold, net −1,680,177 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 390 holders
| BlackRock, Inc. | 0.02% | Add +0.1% | 28,314,410 | $1.0B |
| Baker Bros. Advisors LP | 2.03% | No change | 10,012,267 | $354.0M |
| Vanguard Portfolio Management LLC | 0.02% | — | 9,511,112 | $336.3M |
| State Street Corp. | 0.01% | Reduce -0.1% | 9,465,286 | $334.7M |
| Vanguard Capital Management LLC | 0.01% | — | 7,427,397 | $262.6M |
| Renaissance Technologies | 0.34% | Reduce -7.6% | 6,160,428 | $217.8M |
| American Century Companies Inc. | 0.11% | Add +1.9% | 6,072,103 | $214.7M |
| T. Rowe Price Associates Inc. | 0.02% | Reduce -48.2% | 4,664,576 | $164.9M |
| Dimensional Fund Advisors LP | 0.03% | Add +2.5% | 4,522,378 | $159.9M |
| Commodore Capital LP | 8.59% | Add +18.3% | 4,200,000 | $148.5M |
| Geode Capital Management, LLC | 0.01% | Add +2.5% | 4,182,267 | $147.9M |
| Deep Track Capital, LP | 2.62% | Add +79.5% | 3,590,323 | $127.0M |
| JPMorgan Chase & Co. | 0.01% | Reduce -20.9% | 4,101,789 | $123.7M |
| Wellington Management Group LLP | 0.02% | Reduce -1.7% | 2,970,166 | $105.0M |
| First Trust Advisors LP | 0.08% | Add +104.2% | 2,968,785 | $105.0M |
| Primecap Management Co. | 0.07% | Reduce -0.9% | 2,539,990 | $89.8M |
| Nuveen, LLC | 0.02% | Add +1.4% | 2,460,569 | $87.0M |
| Holocene Advisors, LP | 0.20% | New | 2,317,326 | $81.9M |
| Citadel Advisors | 0.06% | Add +87.1% | 2,241,584 | $79.3M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +3.9% | 2,236,756 | $79.1M |
| BVF Inc. | 2.25% | New | 2,000,000 | $70.7M |
| Soleus Capital Management, L.P. | 2.82% | Add +49.0% | 1,970,864 | $69.7M |
| Goldman Sachs Group Inc. | 0.01% | Reduce -17.0% | 1,882,178 | $66.6M |
| Loomis Sayles & Co. L P | 0.08% | Reduce -6.2% | 1,784,581 | $63.1M |
| Morgan Stanley | 0.00% | Reduce -8.1% | 1,736,091 | $61.4M |
| Northern Trust Corp. | 0.01% | Add +2.6% | 1,697,082 | $60.0M |
| RTW Investments, LP | 0.59% | No change | 1,672,356 | $59.1M |
| Affinity Asset Advisors, LLC | 2.86% | Add +35.0% | 1,350,000 | $47.7M |
| FMR LLC | 0.00% | Reduce -2.3% | 1,323,747 | $46.8M |
| Bank of America Corp. | 0.00% | Reduce -9.2% | 1,210,851 | $42.8M |
| Avoro Capital Advisors LLC | 0.42% | Reduce -14.3% | 1,200,000 | $42.4M |
| Vanguard Fiduciary Trust Co. | 0.01% | — | 1,129,236 | $39.9M |
| Artisan Partners Limited Partnership | 0.06% | Reduce -17.6% | 1,111,741 | $39.3M |
| Bank of New York Mellon Corp | 0.01% | Reduce -3.5% | 1,036,460 | $36.6M |
| Marshall Wace, LLP | 0.04% | Add +669.3% | 999,322 | $35.3M |
| Principal Financial Group Inc. | 0.02% | Add +1.1% | 958,016 | $33.9M |
| Panagora Asset Management Inc. | 0.12% | Add +0.4% | 932,942 | $33.0M |
| T. Rowe Price Investment Management, Inc. | 0.02% | Add +42504.9% | 894,276 | $31.6M |
| Pictet Asset Management Holding SA | 0.03% | Reduce -36.2% | 942,184 | $30.2M |
| Driehaus Capital Management LLC | 0.21% | Reduce -0.6% | 791,963 | $28.0M |
| Two Sigma Investments, LP | 0.02% | Reduce -35.7% | 780,683 | $27.6M |
| Ameriprise Financial Inc. | 0.01% | Add +39.5% | 741,141 | $26.2M |
| D. E. Shaw & Co. | 0.02% | Reduce -22.1% | 710,297 | $25.1M |
| Frazier Life Sciences Management, L.P. | 0.64% | No change | 700,647 | $24.8M |
| Pacer Advisors, Inc. | 0.07% | Add +2.0% | 688,563 | $24.3M |
| Public Sector Pension Investment Board | 0.07% | Add +0.9% | 677,405 | $24.0M |
| Man Group plc | 0.05% | Add +100.0% | 625,046 | $22.1M |
| Bain Capital Life Sciences Investors, LLC | 1.95% | New | 610,000 | $21.6M |
| Balyasny Asset Management L.P. | 0.04% | Reduce -13.7% | 586,775 | $20.7M |
| Segall Bryant & Hamill, LLC | 0.30% | Reduce -4.8% | 585,769 | $20.7M |
| Woodline Partners LP | 0.07% | No change | 558,567 | $19.8M |
| BNP Paribas Financial Markets | 0.01% | Add +22.7% | 527,967 | $18.7M |
| Invesco Ltd. | 0.00% | Reduce -2.7% | 524,275 | $18.5M |
| Prosight Management, LP | 2.98% | New | 513,632 | $18.2M |
| UBS Group AG | 0.00% | Reduce -80.5% | 495,023 | $17.5M |
| Silverarc Capital Management, LLC | 1.92% | New | 460,314 | $16.3M |
| Rhumbline Advisers | 0.01% | Add +2.4% | 449,531 | $15.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +2.1% | 403,153 | $14.3M |
| Fisher Asset Management | 0.00% | Reduce 0.0% | 390,479 | $13.8M |
| Rice Hall James & Associates, LLC | 0.77% | Add +2.9% | 390,344 | $13.8M |
| AQR Capital Management | 0.01% | Reduce -25.3% | 383,977 | $13.6M |
| Legal & General Group Plc | 0.00% | Reduce -11.4% | 380,722 | $13.5M |
| Glenmede Trust Co. NA | 0.07% | Reduce -8.4% | 378,090 | $13.4M |
| Logos Global Management LP | 0.64% | New | 350,000 | $12.4M |
| Nomura Asset Management International Inc. | 0.02% | Reduce -5.9% | 339,998 | $12.0M |
| California Public Employees Retirement System | 0.01% | Add +1.1% | 328,202 | $11.6M |
| Spruce Street Capital LP | 2.70% | New | 317,992 | $11.2M |
| Swiss National Bank | 0.01% | Add +0.4% | 310,300 | $11.0M |
| Victory Capital Management Inc. | 0.01% | Reduce -23.3% | 308,929 | $10.9M |
| Royal Bank of Canada | 0.00% | Reduce -6.5% | 304,337 | $10.8M |
| VIRGINIA RETIREMENT SYSTEMS ET Al | 0.08% | Reduce -69.2% | 300,383 | $10.6M |
| Raymond James Financial Inc. | 0.00% | Reduce -3.3% | 317,434 | $10.0M |
| Squarepoint Ops LLC | 0.02% | Reduce -74.7% | 277,619 | $9.8M |
| Gendell Jeffrey L | 0.13% | New | 263,604 | $9.3M |
| C WorldWide Group Holding A/S | 0.19% | No change | 250,000 | $8.8M |
| Mackenzie Financial Corp. | 0.01% | Add +161.1% | 249,182 | $8.8M |
| S&co Inc. | 0.54% | Add +21.3% | 244,760 | $8.7M |
| Peregrine Capital Management LLC | 0.32% | Reduce -4.1% | 244,007 | $8.6M |
| Capital Fund Management S.A. | 0.08% | Add +61.2% | 243,043 | $8.6M |
| Palo Alto Investors LP | 1.31% | No change | 242,560 | $8.6M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.01% | Reduce -0.6% | 239,671 | $8.5M |
| Eagle Health Investments LP | 1.77% | Add +191.8% | 238,673 | $8.4M |
| Senator Investment Group LP | 0.38% | New | 235,000 | $8.3M |
| Atle Fund Management AB | 2.66% | No change | 242,473 | $8.2M |
| Acadian Asset Management LLC | 0.01% | Reduce -56.3% | 227,939 | $8.1M |
| Robeco Institutional Asset Management B.V. | 0.01% | Reduce -22.8% | 220,521 | $7.8M |
| Engineers Gate Manager LP | 0.09% | Add +336.8% | 208,497 | $7.4M |
| Alliancebernstein L.P. | 0.00% | Add +20.9% | 260,935 | $7.3M |
| ExodusPoint Capital Management, LP | 0.07% | New | 204,324 | $7.2M |
| Neuberger Berman Group LLC | 0.01% | Add +29.1% | 197,220 | $7.0M |
| Martingale Asset Management L P | 0.17% | Add +14.4% | 194,766 | $6.9M |
| Rock Springs Capital Management LP | 0.38% | Add +32.1% | 183,986 | $6.5M |
| California State Teachers Retirement System | 0.01% | Add +23.5% | 183,795 | $6.5M |
| Franklin Resources Inc. | 0.00% | Reduce -5.3% | 182,535 | $6.5M |
| SG Americas Securities, LLC | 0.01% | Add +399.0% | 178,993 | $6.3M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.01% | Reduce -8.3% | 178,455 | $6.3M |
| Barclays PLC | 0.00% | Reduce -69.0% | 174,983 | $6.2M |
| Hudson Bay Capital Management LP | 0.04% | New | 173,626 | $6.1M |
| Rafferty Asset Management, LLC | 0.02% | Reduce -20.1% | 162,424 | $5.7M |
| Tetragon Partners GP Ltd | 1.11% | Add +13.2% | 159,791 | $5.7M |
"% of holder's portfolio" is ALKS's weight in each manager's 13F, not the share of Alkermes PLC the manager owns.