ALKERMES PLC ALKS
SHS · Common Stock · CUSIP G01767105
- SectorHealth care
- IndustryPharmaceutical Preparations
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.7m this quarter). Holder counts are more reliable. Shares outstanding: 165.1m as of 2025-10-24, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $27.99. Options: 7 managers hold calls ($5.8m notional), 9 hold puts ($22.4m).
Trends to Q4 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 275 |
| Q4 2022 | 279 |
| Q1 2023 | 270 |
| Q2 2023 | 294 |
| Q3 2023 | 309 |
| Q4 2023 | 302 |
| Q1 2024 | 336 |
| Q2 2024 | 322 |
| Q3 2024 | 339 |
| Q4 2024 | 345 |
| Q1 2025 | 372 |
| Q2 2025 | 355 |
| Q3 2025 | 359 |
| Q4 2025 | 367 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2024 | 171 | 142 |
| Q2 2024 | 172 | 167 |
| Q3 2024 | 171 | 158 |
| Q4 2024 | 156 | 172 |
| Q1 2025 | 184 | 162 |
| Q2 2025 | 192 | 174 |
| Q3 2025 | 190 | 169 |
| Q4 2025 | 186 | 172 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2025 | $7.7m | $14.3m | 1.86 |
| Q2 2025 | $15.5m | $11.0m | 0.71 |
| Q3 2025 | $27.0m | $13.2m | 0.49 |
| Q4 2025 | $5.8m | $22.4m | 3.83 |
Biggest buyers
| WELLINGTON MANAGEMENT GROUP LLP | Added | +2.6m |
| Deep Track Capital, LP | New | +2.0m |
| BAKER BROS. ADVISORS LP | Added | +1.9m |
| UBS Group AG | Added | +1.8m |
| AMERICAN CENTURY COMPANIES INC | Added | +1.6m |
| Soleus Capital Management, L.P. | New | +1.3m |
| STATE STREET CORP | Added | +932.5k |
| DIMENSIONAL FUND ADVISORS LP | Added | +714.8k |
| Balyasny Asset Management L.P. | New | +679.6k |
| Squarepoint Ops LLC | Added | +650.5k |
Biggest sellers
| JPMORGAN CHASE & CO | Reduced | -2.7m |
| Holocene Advisors, LP | Sold out | -2.5m |
| Paradigm Biocapital Advisors LP | Sold out | -1.7m |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | -1.2m |
| Avoro Capital Advisors LLC | Reduced | -840.0k |
| Artisan Partners Limited Partnership | Reduced | -760.6k |
| Man Group plc | Reduced | -584.8k |
| Sio Capital Management, LLC | Reduced | -579.5k |
| MPM BIOIMPACT LLC | Sold out | -549.3k |
| EcoR1 Capital, LLC | Sold out | -500.0k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $3.3m119.1k shares |
| Walleye Trading LLC | Added | $705.1k25.2k shares |
| Walleye Capital LLC | Added | $618.4k22.1k shares |
| CITADEL ADVISORS LLC | New | $610.0k21.8k shares |
| JANE STREET GROUP, LLC | Reduced | $263.0k9.4k shares |
| GROUP ONE TRADING LLC | Reduced | $173.5k6.2k shares |
| SIMPLEX TRADING, LLC | Reduced | $137.1k4.9k shares |
Biggest puts
| Balyasny Asset Management L.P. | New | $11.7m419.7k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $4.1m145.6k shares |
| CITADEL ADVISORS LLC | Added | $2.3m82.4k shares |
| JANE STREET GROUP, LLC | Reduced | $954.1k34.1k shares |
| SIMPLEX TRADING, LLC | Added | $794.6k28.4k shares |
| GROUP ONE TRADING LLC | Reduced | $775.0k27.7k shares |
| Walleye Capital LLC | Added | $772.2k27.6k shares |
| Walleye Trading LLC | New | $665.9k23.8k shares |
| IMC-Chicago, LLC | New | $296.6k10.6k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-04-28 | 15.8% |
| BAKER BROS. ADVISORS LP 13G · institution new · filed 2026-02-17 | 6.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-28 | 5.8% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-28 | 5.2% |
| STATE STREET CORP 13G · institution +0.3 pts · filed 2025-11-10 | 5.2% |
Fell to 5% or below in the last year: PRICE T ROWE ASSOCIATES INC /MD/ (2.8%, 2026-05-15), VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)
Insider purchases and sales in Q4 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2024 | 0 | — | 3 | $454.3k | $378.4k |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 0 | — | — |
| Q4 2024 | 0 | — | 3 | $5.0m | $5.0m |
| Q1 2025 | 0 | — | 2 | $15.3m | $15.3m |
| Q2 2025 | 0 | — | 1 | $210.1k | $210.1k |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 1 | $786.8k | $786.8k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-12-03 | Hopkinson Craig C. EVP R&D, Chief Medical Officer | Sold plan | $112.4k3.7k shares |
| 2025-12-01 | Hopkinson Craig C. EVP R&D, Chief Medical Officer | Sold plan | $117.2k4.0k shares |
| 2025-11-03 | Hopkinson Craig C. EVP R&D, Chief Medical Officer | Sold plan | $273.4k9.0k shares |
| 2025-10-15 | Hopkinson Craig C. EVP R&D, Chief Medical Officer | Sold plan | $283.8k9.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q4 2025
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 28.3m $791.1m | Added +300.3k |
| VANGUARD GROUP INC 0.01% of their portfolio | 18.0m $503.8m | Reduced -172.1k |
| BAKER BROS. ADVISORS LP 1.64% of their portfolio | 10.0m $280.1m | Added +1.9m |
| STATE STREET CORP 0.01% of their portfolio | 9.5m $265.1m | Added +932.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.03% of their portfolio | 9.0m $251.8m | Reduced -1.2m |
| RENAISSANCE TECHNOLOGIES LLC 0.29% of their portfolio | 6.7m $186.6m | Added +375.5k |
| AMERICAN CENTURY COMPANIES INC 0.08% of their portfolio | 6.0m $166.7m | Added +1.6m |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 5.2m $145.1m | Reduced -2.7m |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 4.4m $123.5m | Added +714.8k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 4.1m $114.2m | Added +19.4k |
| Commodore Capital LP 6.61% of their portfolio | 3.5m $99.3m | Added +453.2k |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 3.0m $84.5m | Added +2.6m |
| PRIMECAP MANAGEMENT CO/CA/ 0.05% of their portfolio | 2.6m $71.7m | Reduced -194.8k |
| UBS Group AG 0.01% of their portfolio | 2.5m $71.2m | Added +1.8m |
| Nuveen, LLC 0.02% of their portfolio | 2.4m $67.9m | Added +253.6k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 2.3m $63.4m | Added +272.6k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 2.2m $60.2m | Added +12.4k |
| Deep Track Capital, LP 1.28% of their portfolio | 2.0m $56.0m | New |
| NORGES BANK 0.01% of their portfolio | 1.9m $54.4m | Not comparable |
| LOOMIS SAYLES & CO L P 0.06% of their portfolio | 1.9m $53.2m | Reduced -146.3k |
| MORGAN STANLEY 0.00% of their portfolio | 1.9m $52.8m | Added +337.0k |
| RTW INVESTMENTS, LP 0.47% of their portfolio | 1.7m $46.8m | Unchanged |
| NORTHERN TRUST CORP 0.01% of their portfolio | 1.7m $46.3m | Reduced -112.7k |
| Pictet Asset Management Holding SA 0.04% of their portfolio | 1.5m $41.3m | Added +584.2k |
| FIRST TRUST ADVISORS LP 0.03% of their portfolio | 1.5m $40.7m | Added +56.0k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio | 1.5m $40.6m | Added +241.9k |
| Avoro Capital Advisors LLC 0.39% of their portfolio | 1.4m $39.2m | Reduced -840.0k |
| FMR LLC 0.00% of their portfolio | 1.4m $37.9m | Added +59.8k |
| Artisan Partners Limited Partnership 0.06% of their portfolio | 1.3m $37.7m | Reduced -760.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 1.3m $37.3m | Added +236.7k |
| Soleus Capital Management, L.P. 1.57% of their portfolio | 1.3m $37.0m | New |
| TWO SIGMA INVESTMENTS, LP 0.05% of their portfolio | 1.2m $34.0m | Added +556.9k |
| CITADEL ADVISORS LLC 0.02% of their portfolio | 1.2m $33.5m | Added +493.4k |
| Squarepoint Ops LLC 0.06% of their portfolio | 1.1m $30.7m | Added +650.5k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 1.1m $30.1m | Reduced -350.4k |
| Affinity Asset Advisors, LLC 2.01% of their portfolio | 1.0m $28.0m | Reduced -250.0k |
| VIRGINIA RETIREMENT SYSTEMS ET Al 0.16% of their portfolio | 976.5k $27.3m | Added +75.2k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 947.6k $26.5m | Added +47.3k |
| PANAGORA ASSET MANAGEMENT INC 0.09% of their portfolio | 929.0k $26.0m | Added +41.8k |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 911.3k $25.5m | Added +382.5k |
| Driehaus Capital Management LLC 0.15% of their portfolio | 797.0k $22.3m | Reduced -30.5k |
| Frazier Life Sciences Management, L.P. 0.53% of their portfolio | 700.6k $19.6m | Unchanged |
| Balyasny Asset Management L.P. 0.04% of their portfolio | 679.6k $19.0m | New |
| Pacer Advisors, Inc. 0.05% of their portfolio | 674.9k $18.9m | Reduced -133.3k |
| Public Sector Pension Investment Board 0.06% of their portfolio | 671.2k $18.8m | Reduced -39.5k |
| SEGALL BRYANT & HAMILL, LLC 0.23% of their portfolio | 615.3k $17.2m | Added +18.8k |
| BARCLAYS PLC 0.01% of their portfolio | 565.0k $15.8m | Added +8.4k |
| TWO SIGMA ADVISERS, LP 0.03% of their portfolio | 562.6k $15.7m | Added +357.4k |
| Woodline Partners LP 0.06% of their portfolio | 558.6k $15.6m | Unchanged |
| Invesco Ltd. 0.00% of their portfolio | 538.7k $15.1m | Reduced -45.6k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 531.4k $14.9m | Reduced -26.5k |
| MetLife Investment Management, LLC 0.07% of their portfolio | 530.4k $14.8m | Reduced -176.8k |
| ACADIAN ASSET MANAGEMENT LLC 0.02% of their portfolio | 522.1k $14.6m | Reduced -46.6k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 514.3k $14.4m | Added +141.9k |
| VOYA INVESTMENT MANAGEMENT LLC 0.01% of their portfolio | 501.8k $14.0m | Reduced -31.8k |
| Opaleye Management Inc. 1.81% of their portfolio | 490.0k $13.7m | Added +40.0k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 439.2k $12.3m | Reduced -34.6k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 430.3k $12.0m | Reduced -330.9k |
| Legal & General Group Plc 0.00% of their portfolio | 429.5k $12.0m | Reduced -70.1k |
| GLENMEDE TRUST CO NA 0.05% of their portfolio | 412.9k $11.6m | First filing |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 402.6k $11.3m | Added +58.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 394.9k $11.0m | Added +2.4k |
| Fisher Asset Management, LLC 0.00% of their portfolio | 390.5k $10.9m | Added +67.7k |
| RICE HALL JAMES & ASSOCIATES, LLC 0.58% of their portfolio | 379.5k $10.6m | Reduced -5.9k |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. 0.02% of their portfolio | 361.4k $10.1m | First filing |
| Allianz Asset Management GmbH 0.01% of their portfolio | 347.3k $9.7m | Reduced -177.5k |
| Bridgewater Associates, LP 0.04% of their portfolio | 344.5k $9.6m | New |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 328.2k $9.1m | Reduced -118.7k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 325.5k $9.1m | Reduced -93.8k |
| California Public Employees Retirement System 0.01% of their portfolio | 324.6k $9.1m | Added +3.7k |
| Man Group plc 0.02% of their portfolio | 312.5k $8.7m | Reduced -584.8k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 310.6k $8.7m | Reduced -105.2k |
| Swiss National Bank 0.01% of their portfolio | 309.2k $8.7m | Added +5.6k |
| Edgestream Partners, L.P. 0.23% of their portfolio | 291.3k $8.2m | Added +31.9k |
| Robeco Institutional Asset Management B.V. 0.01% of their portfolio | 285.7k $8.0m | Added +151.3k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 276.6k $7.7m | New |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio | 273.2k $7.6m | Added +8.7k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.22% of their portfolio | 254.3k $7.1m | Reduced -3.5k |
| C WorldWide Group Holding A/S 0.12% of their portfolio | 250.0k $7.0m | Unchanged |
| Palo Alto Investors LP 0.94% of their portfolio | 242.6k $6.8m | Added +58.6k |
| Atle Fund Management AB 2.16% of their portfolio | 242.5k $6.8m | Reduced -10.4k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.01% of their portfolio | 241.1k $6.7m | Added +239.4k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 233.0k $6.5m | Added +100.4k |
| Abacus FCF Advisors LLC 0.80% of their portfolio | 219.5k $6.1m | New |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 215.9k $6.0m | Reduced -22.7k |
| Rafferty Asset Management, LLC 0.02% of their portfolio | 203.3k $5.7m | Added +23.4k |
| S&CO INC 0.35% of their portfolio | 201.8k $5.6m | Added +550 |
| HRT FINANCIAL LP 0.02% of their portfolio | 200.2k $5.6m | Added +181.9k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 194.5k $5.4m | Added +55.4k |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 194.5k $5.4m | Reduced -15.3k |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 192.8k $5.4m | Added +8.5k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 190.7k $5.3m | Reduced -35.1k |
| WEDGE CAPITAL MANAGEMENT L L P/NC 0.09% of their portfolio | 172.2k $4.8m | Added +31.2k |
| MARTINGALE ASSET MANAGEMENT L P 0.12% of their portfolio | 170.3k $4.8m | Added +5.2k |
| INTECH INVESTMENT MANAGEMENT LLC 0.04% of their portfolio | 159.6k $4.5m | Added +85.5k |
| BESSEMER GROUP INC 0.01% of their portfolio | 157.6k $4.4m | Added +155.4k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 157.4k $4.4m | Reduced -22.1k |
| NEUBERGER BERMAN GROUP LLC 0.00% of their portfolio | 152.8k $4.3m | Added +51 |
| CAPITAL FUND MANAGEMENT S.A. 0.04% of their portfolio | 150.8k $4.2m | Added +29.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 149.3k $4.2m | Reduced -46.7k |