AlkermesALKS
13F holders, Q3 2025 (September 30)358holders +5
42new positions
37sold out
8famous investors
$29.96avg. 13F price*
At the end of Q3 2025, 358 institutions reported holding Alkermes PLC (ALKS) in their 13F filings, up 5 from Q2 2025. 42 opened new positions and 37 sold out. The largest holders were BlackRock, Inc. ($839.2M), Vanguard Group Inc. ($545.4M) and T. Rowe Price Associates Inc. ($307.2M). 8 famous investors held it, including Jim Simons / Peter Brown (0.2% of Renaissance Technologies's portfolio), Ken Griffin (0.0% 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 Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 42 | $85.2M |
| Exits | 37 | $31.7M |
All 13F filers, Q2 2025 → Q3 2025: 16,259,563 shares bought and 14,251,835 shares sold, net +2,007,728 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 358 holders
| BlackRock, Inc. | 0.01% | Add +0.4% | 27,972,078 | $839.2M |
| Vanguard Group Inc. | 0.01% | Reduce -1.8% | 18,179,511 | $545.4M |
| T. Rowe Price Associates Inc. | 0.03% | Add +2.0% | 10,238,357 | $307.2M |
| State Street Corp. | 0.01% | Add +4.0% | 8,540,351 | $256.2M |
| Baker Bros. Advisors LP | 1.76% | Add +26.2% | 8,091,351 | $242.7M |
| Renaissance Technologies | 0.25% | Add +8.3% | 6,292,528 | $188.8M |
| American Century Companies Inc. | 0.07% | Add +20.2% | 4,397,471 | $131.9M |
| Geode Capital Management, LLC | 0.01% | Add +0.9% | 4,061,394 | $121.9M |
| JPMorgan Chase & Co. | 0.01% | Reduce -18.8% | 3,928,170 | $117.8M |
| Dimensional Fund Advisors LP | 0.02% | Add +19.4% | 3,697,996 | $110.9M |
| Commodore Capital LP | 4.54% | Add +26.4% | 3,096,754 | $92.9M |
| Primecap Management Co. | 0.06% | Reduce -4.9% | 2,759,080 | $82.8M |
| Holocene Advisors, LP | 0.17% | Reduce -13.5% | 2,469,030 | $74.1M |
| Avoro Capital Advisors LLC | 0.87% | Reduce -22.8% | 2,240,000 | $67.2M |
| Nuveen, LLC | 0.02% | Add +6.1% | 2,173,476 | $65.2M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +2.3% | 2,140,373 | $64.2M |
| Artisan Partners Limited Partnership | 0.09% | Add +36.8% | 2,109,772 | $63.3M |
| Loomis Sayles & Co. L P | 0.07% | Reduce -2.9% | 2,048,851 | $61.5M |
| Goldman Sachs Group Inc. | 0.01% | Add +19.6% | 1,994,945 | $59.8M |
| Northern Trust Corp. | 0.01% | Reduce -2.6% | 1,766,180 | $53.0M |
| Paradigm Biocapital Advisors LP | 1.53% | Add +25.0% | 1,719,334 | $51.6M |
| RTW Investments, LP | 0.62% | Reduce -64.3% | 1,672,356 | $50.2M |
| Morgan Stanley | 0.00% | Reduce -13.9% | 1,551,499 | $46.5M |
| Bank of New York Mellon Corp | 0.01% | Reduce -7.3% | 1,424,466 | $42.7M |
| First Trust Advisors LP | 0.03% | Add +0.1% | 1,398,021 | $41.9M |
| FMR LLC | 0.00% | Add +1.4% | 1,295,493 | $38.9M |
| Affinity Asset Advisors, LLC | 3.60% | Add +25.0% | 1,250,000 | $37.5M |
| Arrowstreet Capital, Limited Partnership | 0.02% | Add +1070.6% | 1,208,944 | $36.3M |
| Bank of America Corp. | 0.00% | Reduce -49.1% | 1,096,455 | $32.9M |
| VIRGINIA RETIREMENT SYSTEMS ET Al | 0.18% | New | 901,333 | $27.0M |
| Principal Financial Group Inc. | 0.01% | Reduce -1.6% | 900,330 | $27.0M |
| Man Group plc | 0.05% | Add +225.3% | 897,274 | $26.9M |
| Panagora Asset Management Inc. | 0.11% | Add +1.1% | 887,197 | $26.6M |
| Pictet Asset Management Holding SA | 0.03% | Add +231.8% | 893,046 | $26.6M |
| Driehaus Capital Management LLC | 0.18% | Add +0.1% | 827,473 | $24.8M |
| Pacer Advisors, Inc. | 0.06% | Reduce -10.9% | 808,132 | $24.2M |
| BNP Paribas Financial Markets | 0.02% | Reduce -33.0% | 761,203 | $22.8M |
| UBS Group AG | 0.00% | Reduce -43.8% | 754,166 | $22.6M |
| Public Sector Pension Investment Board | 0.08% | Add +11.6% | 710,700 | $21.3M |
| MetLife Investment Management, LLC | 0.10% | Add +7.7% | 707,196 | $21.2M |
| Citadel Advisors | 0.02% | Add +1783.4% | 704,834 | $21.1M |
| Frazier Life Sciences Management, L.P. | 0.63% | Reduce -30.0% | 700,647 | $21.0M |
| Sio Capital Management, LLC | 5.12% | New | 674,840 | $20.2M |
| Two Sigma Investments, LP | 0.03% | Add +101.4% | 656,499 | $19.7M |
| Segall Bryant & Hamill, LLC | 0.24% | Add +0.4% | 596,479 | $17.9M |
| Invesco Ltd. | 0.00% | Reduce -4.7% | 584,293 | $17.5M |
| Acadian Asset Management LLC | 0.03% | Reduce -17.3% | 568,675 | $17.0M |
| Woodline Partners LP | 0.08% | Add +0.0% | 558,567 | $16.8M |
| Ameriprise Financial Inc. | 0.00% | Reduce -21.0% | 557,866 | $16.7M |
| Barclays PLC | 0.01% | Reduce -19.8% | 556,651 | $16.7M |
| MPM Bioimpact LLC | 2.70% | No change | 549,262 | $16.5M |
| Voya Investment Management LLC | 0.02% | Add +6.0% | 533,650 | $16.0M |
| D. E. Shaw & Co. | 0.01% | Reduce -35.5% | 528,749 | $15.9M |
| Allianz Asset Management GmbH | 0.02% | Add +3908.2% | 524,795 | $15.7M |
| EcoR1 Capital, LLC | 0.72% | No change | 500,000 | $15.0M |
| Legal & General Group Plc | 0.00% | Reduce -6.7% | 499,623 | $15.0M |
| Rhumbline Advisers | 0.01% | Add +0.2% | 473,837 | $14.2M |
| Glenmede Investment Management, LP | 0.07% | Reduce -5.7% | 455,641 | $13.7M |
| Opaleye Management Inc. | 1.92% | New | 450,000 | $13.5M |
| Raymond James Financial Inc. | 0.00% | Reduce -1.6% | 446,925 | $13.4M |
| Squarepoint Ops LLC | 0.03% | Add +803.9% | 445,306 | $13.4M |
| Mackenzie Financial Corp. | 0.02% | Add +52.4% | 442,350 | $13.3M |
| Royal Bank of Canada | 0.00% | Add +85.2% | 419,290 | $12.6M |
| Canada Pension Plan Investment Board | 0.01% | Add +12.1% | 415,800 | $12.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -41.5% | 392,427 | $11.8M |
| Jane Street Group, LLC | 0.01% | Add +9.8% | 392,181 | $11.8M |
| Rice Hall James & Associates, LLC | 0.63% | Reduce -8.7% | 385,342 | $11.6M |
| Wellington Management Group LLP | 0.00% | Reduce -77.9% | 375,190 | $11.3M |
| Macquarie Group Ltd. | 0.01% | Reduce -0.4% | 372,890 | $11.2M |
| AQR Capital Management | 0.01% | Reduce -17.7% | 372,422 | $11.2M |
| Janus Henderson Group PLC | 0.00% | Add +68.4% | 344,490 | $10.3M |
| Victory Capital Management Inc. | 0.01% | Add +43.1% | 344,202 | $10.3M |
| Handelsbanken Fonder AB | 0.03% | Add +4.3% | 332,100 | $10.0M |
| Fisher Asset Management | 0.00% | Add +10.6% | 322,748 | $9.7M |
| California Public Employees Retirement System | 0.01% | Add +4.0% | 320,879 | $9.6M |
| Swiss National Bank | 0.01% | Add +1.4% | 303,600 | $9.1M |
| Voloridge Investment Management, LLC | 0.03% | Add +101.2% | 264,446 | $7.9M |
| Edgestream Partners, L.P. | 0.23% | Add +251.0% | 259,411 | $7.8M |
| Peregrine Capital Management LLC | 0.23% | Reduce -2.6% | 257,795 | $7.7M |
| C WorldWide Group Holding A/S | 0.12% | No change | 250,000 | $7.5M |
| ExodusPoint Capital Management, LP | 0.10% | Add +54.7% | 249,727 | $7.5M |
| Stempoint Capital LP | 1.46% | Reduce -31.2% | 241,637 | $7.2M |
| Alliancebernstein L.P. | 0.00% | Add +18.0% | 238,539 | $7.2M |
| AXA Investment Managers S.A. | 0.02% | — | 236,897 | $7.1M |
| Sei Investments Co. | 0.01% | Add +4.1% | 225,807 | $6.8M |
| Prudential Financial Inc. | 0.01% | Add +19.0% | 209,826 | $6.3M |
| Krensavage Asset Management, LLC | 2.66% | No change | 207,822 | $6.2M |
| Deutsche Bank AG | 0.00% | Add +7.8% | 206,422 | $6.2M |
| Two Sigma Advisers, LP | 0.01% | Add +2530.8% | 205,200 | $6.2M |
| S&co Inc. | 0.37% | Reduce -8.8% | 201,210 | $6.0M |
| New York State Common Retirement Fund | 0.01% | Add +38.9% | 195,999 | $5.9M |
| Franklin Resources Inc. | 0.00% | Add +96.1% | 184,346 | $5.5M |
| Palo Alto Investors LP | 1.02% | Reduce -16.8% | 183,938 | $5.5M |
| Silverarc Capital Management, LLC | 0.78% | New | 180,513 | $5.4M |
| Rafferty Asset Management, LLC | 0.02% | Add +11.5% | 179,902 | $5.4M |
| Russell Investments Group, Ltd. | 0.01% | Add +27.5% | 179,465 | $5.3M |
| Martingale Asset Management L P | 0.12% | Add +22.1% | 165,110 | $5.0M |
| Neuberger Berman Group LLC | 0.00% | Reduce -22.2% | 152,721 | $4.6M |
| California State Teachers Retirement System | 0.00% | Add +2.7% | 148,909 | $4.5M |
| Millennium Management | 0.00% | Add +89.2% | 147,460 | $4.4M |
"% of holder's portfolio" is ALKS's weight in each manager's 13F, not the share of Alkermes PLC the manager owns.