ALKS · Alkermes plc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding ALKS
All superinvestors →Holder Concentration
Across 426 13F filersWho Holds ALKS
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 424 filers, like-for-like change -0.4%; actively managed books -1.4%; index-like books +1.4%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 48.8% | 229 | +3.5% |
| Exempt adviser | 0.6% | 3 | -3.9% |
| Adviser | 4.7% | 12 | +24.7% |
| Bank | 8.0% | 20 | -23.8% |
| Insurer | 0.6% | 3 | -4.6% |
| Broker-dealer | 0.0% | 2 | +10.7% |
| Benefit plan | 0.3% | 6 | -16.6% |
| Non-US | 2.9% | 9 | +67.3% |
| Holding company | 21.2% | 10 | +3.1% |
| Unknown | 13.0% | 130 | -11.4% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 37.1% | 43 | +1.4% |
| Systematic-like | 3.7% | 22 | -5.2% |
| Concentrated | 11.8% | 76 | -0.9% |
| Diversified active | 47.4% | 283 | -1.2% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | -100.0% |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 55.3% | 241 | -0.9% |
| Medium turnover | 25.0% | 95 | +1.2% |
| High turnover | 7.3% | 47 | -4.1% |
| Unknown | 12.4% | 41 | +1.3% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 11.7% | 50 | +2.6% |
| Medium horizon | 26.4% | 76 | -2.7% |
| Long horizon | 56.1% | 273 | -2.4% |
| Unknown | 5.9% | 25 | +31.0% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 2.2% | 109 | +16.4% |
| $1B to $10B | 10.8% | 118 | +0.7% |
| $10B to $100B | 21.3% | 122 | +1.9% |
| $100B or more | 65.6% | 75 | -1.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 0.6% | 111 | +29.1% |
| Pooled investment vehicles | 20.3% | 44 | +1.0% |
| Registered funds and BDCs | 23.1% | 31 | +5.2% |
| Pension and profit sharing plans | 0.0% | 3 | +138.6% |
| Insurance companies | 0.4% | 3 | +231.6% |
| Charitable organizations | 0.0% | 1 | 0.0% |
| Governments and sovereign funds | 0.7% | 5 | -7.8% |
| Other investment advisers | 0.0% | 5 | +12.6% |
| Other | 0.1% | 2 | +86.2% |
| Diversified | 3.5% | 23 | -3.3% |
| Corporations | 0.0% | 0 | — |
| Unknown | 51.2% | 196 | -3.9% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 23.7% | 60 | +4.3% |
| Private equity funds | 1.0% | 11 | +159.1% |
| Venture capital funds | 0.0% | 1 | -100.0% |
| Real estate funds | 0.0% | 5 | +35.8% |
| Liquidity funds | 0.0% | 1 | new |
| Securitized asset funds | 0.0% | 1 | -99.3% |
| Other private funds | 8.1% | 20 | +14.3% |
| Mixed private funds | 0.6% | 3 | -53.8% |
| Private funds, type not stated | 0.1% | 5 | +6.2% |
| No private funds | 15.9% | 124 | +1.1% |
| Unknown | 50.6% | 193 | -3.9% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 94.3% | 365 | -0.2% |
| Outside the US | 5.7% | 59 | -5.2% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 3 holders with no observed 2026-03-31 13F and 4 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
424 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $6,868,922 (1 buying, 1 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 35.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ALKS's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | ELVN Enliven Therapeutics, Inc. | 17 |
| 2 | SYRE Spyre Therapeutics, Inc. | 17 |
| 3 | XENE Xenon Pharmaceuticals Inc. | 17 |
| 4 | CLDX Celldex Therapeutics, Inc. | 15 |
| 5 | IMVT Immunovant, Inc. | 11 |
| 6 | ORKA Oruka Therapeutics, Inc. | 16 |
| 7 | PTGX Protagonist Therapeutics, Inc | 14 |
| 8 | DNTH Dianthus Therapeutics, Inc. /DE/ | 15 |
| 9 | STOK Stoke Therapeutics, Inc. | 10 |
| 10 | CYTK Cytokinetics Inc | 19 |
Shareholder Targets
13F filers that own its peers but not ALKS, quarter ended Jun 30, 2026Found through its holder-overlap peers: ELVN, SYRE, XENE, CLDX, IMVT, ORKA, PTGX, DNTH, STOK, CYTK, RLMD, INSM, GLUE, ACAD, TVTX, TNGX, IPSC, GPCR, DFTX, ERAS. 801 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Avoro Capital Advisors LLC Registered adviser, Concentrated | $1,464,698,460 4 held | CYTK, GPCR, XENE |
| 2 | FARALLON CAPITAL MANAGEMENT LLC Registered adviser, Diversified active | $1,385,694,567 3 held | PTGX, TNGX, IMVT |
| 3 | Capital International Investors Adviser, Diversified active | $1,356,343,607 5 held | INSM, XENE, DFTX |
| 4 | Polar Capital Holdings Plc Registered adviser, Diversified active | $1,312,559,095 11 held | ELVN, XENE, CYTK |
| 5 | Venrock Adviser, LLC Registered adviser, Concentrated | $1,198,036,595 7 held | ORKA, ERAS, SYRE |
| 6 | Paradigm Biocapital Advisors LP Registered adviser, Concentrated | $1,060,146,644 5 held | SYRE, ORKA, TNGX |
| 7 | PERCEPTIVE ADVISORS LLC Registered adviser, Diversified active | $1,002,901,940 6 held | SYRE, TVTX, ORKA |
| 8 | TCG Crossover Management, LLC Unknown, Diversified active | $943,170,003 6 held | TNGX, IMVT, SYRE |
| 9 | Siren, L.L.C. Unknown, Diversified active | $924,966,737 10 held | ERAS, TNGX, ELVN |
| 10 | Capital World Investors Adviser, Diversified active | $867,988,423 6 held | ORKA, DFTX, SYRE |
Fund Ownership of ALKS by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 11.32% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 1.32% | 2,216,455 |
| Index ETFs | 10.00% | 16,781,961 |
| Active ETFs | 0.92% | 1,536,388 |
| Active funds | 3.67% | 6,156,722 |
| Unclassified | 2.24% | 3,753,685 |
| All registered funds | 18.15% | 30,445,211 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $1,531,952,715 | 16.27% | 29,235,739 | Shares | 2026-08-07 | |
| Large BAKER BROS. ADVISORS LP Registered adviser | $524,642,790 | 5.57% | 10,012,267 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $497,318,863 | 5.28% | 9,490,818 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $480,014,130 | 5.10% | 9,160,575 | Shares | 2026-09-22 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $393,787,310 | 4.18% | 7,515,025 | Shares | 2026-08-13 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $353,035,986 | 3.75% | 6,737,328 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $338,552,627 | 3.60% | 6,460,928 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $234,640,702 | 2.49% | 4,477,876 | Shares | 2026-08-12 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $219,811,343 | 2.33% | 4,194,873 | Shares | 2026-08-11 | |
| Mid Deep Track Capital, LP Adviser | $209,600,000 | 2.23% | 4,000,000 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $207,202,123 | 2.20% | 3,954,239 | Shares | 2026-08-12 | |
| Large Holocene Advisors, LP Registered adviser | $188,717,132 | 2.00% | 3,601,472 | Shares | 2026-08-14 | |
| Mid Commodore Capital LP Registered adviser | $157,200,000 | 1.67% | 3,000,000 | Shares | 2026-08-14 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $147,495,727 | 1.57% | 2,814,804 | Shares | 2026-08-14 | |
| Mega PRIMECAP MANAGEMENT CO/CA/ Registered adviser | $132,502,832 | 1.41% | 2,528,680 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $126,861,238 | 1.35% | 2,421,016 | Shares | 2026-08-11 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $122,360,130 | 1.30% | 2,335,117 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $121,787,920 | 1.29% | 2,324,197 | Shares | 2026-08-11 | |
| Mega NORGES BANK Non-US | $113,017,053 | 1.20% | 2,156,814 | Shares | 2026-08-12 | |
| Mid BVF INC/IL | $112,906,489 | 1.20% | 2,154,704 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $106,056,760 | 1.13% | 2,023,984 | Shares | 2026-08-14 | |
| Mid Bain Capital Life Sciences Investors, LLC | $101,547,951 | 1.08% | 1,937,938 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $95,976,834 | 1.02% | 1,831,619 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $91,798,613 | 0.97% | 1,751,882 | Shares | 2026-08-13 | |
| Large RTW INVESTMENTS, LP Registered adviser | $87,631,454 | 0.93% | 1,672,356 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $86,203,291 | 0.92% | 1,645,101 | Shares | 2026-09-02 | |
| Large LOOMIS SAYLES & CO L P Registered adviser | $83,081,142 | 0.88% | 1,585,518 | Shares | 2026-08-14 | |
| Large ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser | $71,683,200 | 0.76% | 1,368,000 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $68,750,423 | 0.73% | 1,312,031 | Shares | 2026-08-14 | |
| Large Driehaus Capital Management LLC Registered adviser | $64,913,591 | 0.69% | 1,238,809 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $61,724,318 | 0.66% | 1,177,945 | Shares | 2026-08-13 | |
| Mega FRANKLIN RESOURCES INC Adviser | $61,320,679 | 0.65% | 1,170,242 | Shares | 2026-08-13 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. Non-US | $60,742,916 | 0.65% | 1,159,216 | Shares | 2026-08-13 | |
| Mega FMR LLC Holding company | $59,443,082 | 0.63% | 1,134,410 | Shares | 2026-08-13 | |
| Mid Affinity Asset Advisors, LLC Registered adviser | $58,950,000 | 0.63% | 1,125,000 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $57,497,573 | 0.61% | 1,097,282 | Shares | 2026-08-06 | |
| Mega T. Rowe Price Investment Management, Inc. Adviser | $57,165,622 | 0.61% | 1,090,947 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $54,407,496 | 0.58% | 1,038,311 | Shares | 2026-08-14 | |
| Mid Soleus Capital Management, L.P. | $53,932,804 | 0.57% | 1,029,252 | Shares | 2026-08-11 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $51,552,272 | 0.55% | 983,822 | Shares | 2026-08-04 | |
| Large MARSHALL WACE, LLP Exempt adviser | $50,825,589 | 0.54% | 969,954 | Shares | 2026-08-13 | |
| Mid SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Registered adviser | $49,792,261 | 0.53% | 950,234 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $48,119,074 | 0.51% | 918,303 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $48,035,551 | 0.51% | 916,709 | Shares | 2026-08-07 | |
| Mega Pictet Asset Management Holding SA | $43,912,562 | 0.47% | 838,026 | Shares | 2026-07-30 | |
| Large Artisan Partners Limited Partnership Registered adviser | $43,544,714 | 0.46% | 831,006 | Shares | 2026-08-13 | |
| Large PANAGORA ASSET MANAGEMENT INC Registered adviser | $40,114,453 | 0.43% | 765,543 | Shares | 2026-08-06 | |
| Mid Frazier Life Sciences Management, L.P. Registered adviser | $36,713,902 | 0.39% | 700,647 | Shares | 2026-08-14 | |
| Large Public Sector Pension Investment Board Non-US | $35,496,022 | 0.38% | 677,405 | Shares | 2026-08-13 | |
| Large FRONTIER CAPITAL MANAGEMENT CO LLC Registered adviser | $34,561,048 | 0.37% | 659,562 | Shares | 2026-08-14 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $34,329,336 | 0.36% | 655,140 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $33,029,029 | 0.35% | 630,325 | Shares | 2026-08-14 | |
| Large Woodline Partners LP Registered adviser | $29,358,776 | 0.31% | 560,282 | Shares | 2026-08-14 | |
| Small Spruce Street Capital LP Registered adviser | $28,499,102 | 0.30% | 543,876 | Shares | 2026-08-13 | |
| Large MetLife Investment Management, LLC Registered adviser | $26,877,217 | 0.29% | 512,924 | Shares | 2026-08-14 | |
| Mid SEGALL BRYANT & HAMILL, LLC Registered adviser | $26,106,832 | 0.28% | 498,222 | Shares | 2026-08-12 | |
| Small Artia Global Partners LP Registered adviser | $23,525,713 | 0.25% | 448,964 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $23,218,803 | 0.25% | 443,107 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $22,152,675 | 0.24% | 422,761 | Shares | 2026-08-14 | |
| Mega Fisher Asset Management, LLC Adviser | $21,960,944 | 0.23% | 419,102 | Shares | 2026-08-04 | |
| Large GENDELL JEFFREY L | $20,744,216 | 0.22% | 395,882 | Shares | 2026-08-14 | |
| Small Prosight Management, LP | $20,665,983 | 0.22% | 394,389 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $20,620,657 | 0.22% | 393,524 | Shares | 2026-08-14 | |
| Mid RICE HALL JAMES & ASSOCIATES, LLC Registered adviser | $20,481,378 | 0.22% | 390,866 | Shares | 2026-08-07 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $20,331,147 | 0.22% | 387,999 | Shares | 2026-08-12 | |
| Large GLENMEDE TRUST CO NA | $18,926,041 | 0.20% | 361,184 | Shares | 2026-08-10 | |
| Large Holocene Advisors, LP Registered adviser | $18,340,000 | 0.19% | 350,000 | Call | 2026-08-14 | |
| Mega California Public Employees Retirement System | $18,195,690 | 0.19% | 347,246 | Shares | 2026-08-14 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $17,661,053 | 0.19% | 337,043 | Shares | 2026-08-14 | |
| Large Ensign Peak Advisors, Inc | $17,564,899 | 0.19% | 335,208 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $17,548,760 | 0.19% | 334,900 | Put | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $16,746,778 | 0.18% | 319,595 | Shares | 2026-08-14 | |
| Mega Swiss National Bank | $16,605,560 | 0.18% | 316,900 | Shares | 2026-08-11 | |
| Mega UBS Group AG Bank | $15,738,338 | 0.17% | 300,350 | Shares | 2026-08-13 | |
| Small Eagle Health Investments LP Registered adviser | $15,578,624 | 0.17% | 297,302 | Shares | 2026-08-10 | |
| Large GW&K Investment Management, LLC Registered adviser | $15,321,078 | 0.16% | 292,387 | Shares | 2026-08-12 | |
| Mid Senator Investment Group LP | $14,410,000 | 0.15% | 275,000 | Shares | 2026-08-12 | |
| Mega JANE STREET GROUP, LLC | $14,189,920 | 0.15% | 270,800 | Put | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $13,766,579 | 0.15% | 262,721 | Shares | 2026-08-12 | |
| Mega NEUBERGER BERMAN GROUP LLC Holding company | $13,634,899 | 0.14% | 260,208 | Shares | 2026-08-13 | |
| Mid C WorldWide Group Holding A/S | $13,100,000 | 0.14% | 250,000 | Shares | 2026-08-04 | |
| Mid Affinity Asset Advisors, LLC Registered adviser | $13,100,000 | 0.14% | 250,000 | Call | 2026-08-13 | |
| Small STEMPOINT CAPITAL LP Registered adviser | $12,995,986 | 0.14% | 248,015 | Shares | 2026-08-14 | |
| Mid S&CO INC | $12,825,424 | 0.14% | 244,760 | Shares | 2026-08-06 | |
| Small Palo Alto Investors LP Registered adviser | $12,710,144 | 0.13% | 242,560 | Shares | 2026-08-19 | |
| Mid PEREGRINE CAPITAL MANAGEMENT LLC Registered adviser | $12,170,162 | 0.13% | 232,255 | Shares | 2026-07-17 | |
| Mega Russell Investments Group, Ltd. | $11,665,496 | 0.12% | 222,624 | Shares | 2026-08-06 | |
| Large FEDERATED HERMES, INC. Adviser | $11,611,263 | 0.12% | 221,589 | Shares | 2026-08-12 | |
| Mega BARCLAYS PLC Bank | $11,524,592 | 0.12% | 219,935 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $11,418,850 | 0.12% | 217,917 | Shares | 2026-08-14 | |
| Mega Amundi Holding company | $11,409,523 | 0.12% | 217,739 | Shares | 2026-08-11 | |
| Small Atle Fund Management AB | $11,178,439 | 0.12% | 213,329 | Shares | 2026-07-24 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $11,159,520 | 0.12% | 212,968 | Shares | 2026-08-14 | |
| Mid Rock Springs Capital Management LP Registered adviser | $10,470,096 | 0.11% | 199,811 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $10,450,288 | 0.11% | 199,433 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $10,344,388 | 0.11% | 197,412 | Shares | 2026-08-24 | |
| Large Schonfeld Strategic Advisors LLC Registered adviser | $10,227,117 | 0.11% | 195,174 | Shares | 2026-08-14 | |
| Large Aberdeen Group plc Holding company | $10,155,382 | 0.11% | 193,805 | Shares | 2026-07-31 | |
| Mega DEUTSCHE BANK AG\ Non-US | $10,024,957 | 0.11% | 191,316 | Shares | 2026-08-07 | |
| Small Tetragon Partners GP Ltd | $9,954,899 | 0.11% | 189,979 | Shares | 2026-08-13 |
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