Mereo BioPharma Group plc - MREO
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 3 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rubric Capital Management LP | History | No change | 15,307,347 | 6,378 | 0.08% | 0.36% | 1 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| 683 Capital Management, LLC | History | Added to | 15,025,000 | 6,260 | 0.27% | 0.52% | 2 | +10,150,000 | 208.21% | Q4 2025 | Feb 17, 2026 |
| EcoR1 Capital, LLC | History | New | 7,856,466 | 3,273 | 0.15% | — | 3 | +7,856,466 | New | Q4 2025 | Feb 17, 2026 |
| Schonfeld Strategic Advisors LLC | History | Added to | 6,090,381 | 2,537 | 0.01% | 0.02% | 4 | +4,357,657 | 251.49% | Q4 2025 | Feb 17, 2026 |
| Tejara Capital Ltd | History | Added to | 2,159,681 | 899 | 0.21% | 2.05% | 5 | +252,837 | 13.26% | Q4 2025 | Feb 05, 2026 |
| DIADEMA PARTNERS LP | History | Added to | 1,999,500 | 833 | 0.14% | 0.82% | 6 | +439,900 | 28.21% | Q4 2025 | Feb 17, 2026 |
| Logos Global Management LP | History | Added to | 1,850,000 | 770 | 0.05% | 0.09% | 7 | +1,350,000 | 270.0% | Q4 2025 | Feb 17, 2026 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | History | Reduced | 1,763,666 | 735 | 0.0% | 0.0% | 8 | -143,109 | -7.51% | Q4 2025 | Feb 13, 2026 |
| Monaco Asset Management SAM | History | Added to | 1,585,214 | 660 | 0.11% | 0.12% | 9 | +639,299 | 67.59% | Q4 2025 | Feb 10, 2026 |
| UBS Group AG | History | Added to | 1,558,931 | 650 | 0.0% | 0.0% | 10 | +588,264 | 60.6% | Q4 2025 | Jan 29, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | New | 1,280,275 | 533 | 0.0% | — | 11 | +1,280,275 | New | Q4 2025 | Feb 17, 2026 |
| MORGAN STANLEY | History | Reduced | 1,273,785 | 530 | 0.0% | 0.0% | 12 | -2,072,562 | -61.94% | Q4 2025 | Feb 13, 2026 |
| JANE STREET GROUP, LLC | History | Added to | 873,704 | 364 | 0.0% | 0.0% | 13 | +389,142 | 80.31% | Q4 2025 | Feb 12, 2026 |
| CITADEL ADVISORS LLC | History | Reduced | 748,700 | 311 | 0.0% | 0.0% | 14 | -2,503,932 | -76.98% | Q4 2025 | Feb 17, 2026 |
| DLD Asset Management, LP | History | Added to | 746,000 | 310 | 0.02% | 0.02% | 15 | +627,000 | 526.89% | Q4 2025 | Feb 13, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 694,100 | 291 | 0.0% | 0.0% | 16 | +23,922 | 3.57% | Q4 2025 | Feb 17, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Reduced | 525,125 | 218 | 0.0% | 0.0% | 17 | -562,971 | -51.74% | Q4 2025 | Feb 17, 2026 |
| GROUP ONE TRADING LLC | History | Added to | 441,636 | 184 | 0.0% | 0.0% | 18 | +305,048 | 223.33% | Q4 2025 | Feb 12, 2026 |
| SIMPLEX TRADING, LLC | History | Added to | 419,477 | 174 | 0.0% | 0.0% | 19 | +223,208 | 113.73% | Q4 2025 | Feb 11, 2026 |
| EntryPoint Capital, LLC | History | New | 400,700 | 166 | 0.06% | — | 20 | +400,700 | New | Q4 2025 | Feb 12, 2026 |
| LUMINUS MANAGEMENT LLC | History | New | 395,000 | 164 | 0.14% | — | 21 | +395,000 | New | Q4 2025 | Feb 17, 2026 |
| Rangeley Capital, LLC | History | New | 364,000 | 151 | 0.13% | — | 22 | +364,000 | New | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Reduced | 312,613 | 130 | 0.0% | 0.0% | 23 | -131,391 | -29.59% | Q4 2025 | Feb 12, 2026 |
| Knott David M Jr | History | No change | 300,337 | 125 | 0.06% | 0.25% | 24 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| Quadrature Capital Ltd | History | New | 266,731 | 111 | 0.0% | — | 25 | +266,731 | New | Q4 2025 | Feb 17, 2026 |
| SPHERA FUNDS MANAGEMENT LTD. | History | New | 255,400 | 106 | 0.02% | — | 26 | +255,400 | New | Q4 2025 | Feb 17, 2026 |
| TWO SIGMA ADVISERS, LP | History | Added to | 251,900 | 104 | 0.0% | 0.0% | 27 | +9,700 | 4.0% | Q4 2025 | Feb 17, 2026 |
| Newtyn Management, LLC | History | New | 224,622 | 93 | 0.01% | — | 28 | +224,622 | New | Q4 2025 | Feb 17, 2026 |
| CITIGROUP INC | History | New | 195,814 | 81 | 0.0% | — | 29 | +195,814 | New | Q4 2025 | Feb 13, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Reduced | 194,371 | 80 | 0.0% | 0.0% | 30 | -396,500 | -67.1% | Q4 2025 | Feb 12, 2026 |
| ADAR1 Capital Management, LLC | History | New | 150,000 | 62 | 0.0% | — | 31 | +150,000 | New | Q4 2025 | Feb 18, 2026 |
| STATE STREET CORP | History | Reduced | 130,643 | 54 | 0.0% | 0.0% | 32 | -2,058 | -1.55% | Q4 2025 | Feb 13, 2026 |
| Virtus Investment Advisers, LLC | History | Added to | 122,595 | 51 | 0.01% | 0.02% | 33 | +81,665 | 199.52% | Q4 2025 | Feb 17, 2026 |
| Graham Capital Management, L.P. | History | New | 116,286 | 48 | 0.0% | — | 34 | +116,286 | New | Q4 2025 | Feb 17, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | No change | 92,534 | 38 | 0.0% | 0.0% | 35 | 0 | 0.0% | Q4 2025 | Feb 09, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Reduced | 83,646 | 34 | 0.0% | 0.0% | 36 | -311,557 | -78.83% | Q4 2025 | Feb 17, 2026 |
| Baader Bank Aktiengesellschaft | History | New | 128,742 | 33 | 0.0% | — | 37 | +128,742 | New | Q4 2025 | Feb 05, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Reduced | 61,435 | 24 | 0.0% | 0.0% | 38 | -194,943 | -76.04% | Q4 2025 | Feb 10, 2026 |
| Caption Management, LLC | History | Reduced | 50,000 | 20 | 0.0% | 0.01% | 40 | -520,414 | -91.23% | Q4 2025 | Feb 17, 2026 |
| Engineers Gate Manager LP | History | New | 49,798 | 20 | 0.0% | — | 39 | +49,798 | New | Q4 2025 | Feb 17, 2026 |
| Clear Harbor Asset Management, LLC | History | Reduced | 35,000 | 14 | 0.0% | 0.01% | 41 | -42,000 | -54.55% | Q4 2025 | Feb 10, 2026 |
| Forefront Analytics, LLC | History | Reduced | 31,768 | 13 | 0.01% | 0.07% | 42 | -1,412 | -4.26% | Q4 2025 | Feb 17, 2026 |
| GOLDMAN SACHS GROUP INC | History | Reduced | 28,026 | 11 | 0.0% | 0.0% | 43 | -2,335,998 | -98.81% | Q4 2025 | Mar 25, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Reduced | 25,492 | 10 | 0.0% | 0.0% | 44 | -413,130 | -94.19% | Q4 2025 | Feb 17, 2026 |
| Centiva Capital, LP | History | No change | 25,000 | 10 | 0.0% | 0.0% | 45 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| Significant Wealth Partners LLC | History | Reduced | 21,689 | 9 | 0.01% | 0.05% | 46 | -26,125 | -54.64% | Q4 2025 | Jan 07, 2026 |
| Aquatic Capital Management LLC | History | Reduced | 21,216 | 8 | 0.0% | 0.0% | 48 | -32,496 | -60.5% | Q4 2025 | Feb 17, 2026 |
| SmartHarvest Portfolios, LLC | History | New | 20,290 | 8 | 0.0% | — | 49 | +20,290 | New | Q4 2025 | Feb 12, 2026 |
| BARCLAYS PLC | History | Added to | 20,100 | 8 | 0.0% | 0.0% | 47 | +14,500 | 258.93% | Q4 2025 | Feb 13, 2026 |
| Three Magnolias Financial Advisors, LLC | History | Reduced | 19,000 | 7 | 0.0% | 0.05% | 53 | -18,000 | -48.65% | Q4 2025 | Jan 20, 2026 |
| RHUMBLINE ADVISERS | History | Added to | 19,146 | 7 | 0.0% | 0.0% | 50 | +10,024 | 109.89% | Q4 2025 | Feb 13, 2026 |
| Newbridge Financial Services Group, Inc. | History | Added to | 17,000 | 7 | 0.0% | 0.0% | 52 | +4,000 | 30.77% | Q4 2025 | Jan 21, 2026 |
| OneDigital Investment Advisors LLC | History | No change | 18,300 | 7 | 0.0% | 0.0% | 51 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| PFG Investments, LLC | History | Reduced | 16,650 | 6 | 0.0% | 0.0% | 54 | -500 | -2.92% | Q4 2025 | Jan 26, 2026 |
| QRG CAPITAL MANAGEMENT, INC. | History | New | 13,503 | 5 | 0.0% | — | 57 | +13,503 | New | Q4 2025 | Feb 02, 2026 |
| AE Wealth Management LLC | History | New | 12,563 | 5 | 0.0% | — | 56 | +12,563 | New | Q4 2025 | Jan 26, 2026 |
| MML INVESTORS SERVICES, LLC | History | New | 12,200 | 5 | 0.0% | — | 55 | +12,200 | New | Q4 2025 | Feb 13, 2026 |
| Astoria Portfolio Advisors LLC. | History | New | 10,000 | 4 | 0.0% | — | 58 | +10,000 | New | Q4 2025 | Feb 24, 2026 |
| GAMMA Investing LLC | History | Added to | 9,561 | 3 | 0.0% | 0.0% | 59 | +380 | 4.14% | Q4 2025 | Jan 05, 2026 |
| TORONTO DOMINION BANK | History | New | 5,500 | 2 | 0.0% | — | 60 | +5,500 | New | Q4 2025 | Feb 17, 2026 |
| Caitong International Asset Management Co., Ltd | History | Reduced | 4,462 | 1 | 0.0% | 0.01% | 62 | -4,014 | -47.36% | Q4 2025 | Mar 03, 2026 |
| Arax Advisory Partners | History | No change | 4,000 | 1 | 0.0% | 0.0% | 61 | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| JANUS HENDERSON GROUP PLC | History | Closed out | 0 | 0 | — | 0.02% | — | -16,290,130 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Frazier Life Sciences Management, L.P. | History | Closed out | 0 | 0 | — | 0.58% | — | -9,440,112 | -100.0% | Q3 2025 | Nov 14, 2025 |
| MANGROVE PARTNERS IM, LLC | History | Closed out | 0 | 0 | — | 1.19% | — | -7,790,580 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Aberdeen Group plc | History | Closed out | 0 | 0 | — | 0.02% | — | -5,538,699 | -100.0% | Q3 2025 | Nov 07, 2025 |
| Rock Springs Capital Management LP | History | Closed out | 0 | 0 | — | 0.55% | — | -4,570,649 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Clearline Capital LP | History | Closed out | 0 | 0 | — | 0.36% | — | -3,834,163 | -100.0% | Q3 2025 | Nov 14, 2025 |
| ALKEON CAPITAL MANAGEMENT LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -3,698,100 | -100.0% | Q3 2025 | Nov 14, 2025 |
| FMR LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,454,900 | -100.0% | Q3 2025 | Nov 13, 2025 |
| Blue Owl Capital Holdings LP | History | Closed out | 0 | 0 | — | 0.8% | — | -1,250,000 | -100.0% | Q3 2025 | Nov 12, 2025 |
| MARSHALL WACE, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -767,744 | -100.0% | Q3 2025 | Nov 13, 2025 |
| Atle Fund Management AB | History | Closed out | 0 | 0 | — | 0.62% | — | -764,901 | -100.0% | Q3 2025 | Nov 04, 2025 |
| Artia Global Partners LP | History | Closed out | 0 | 0 | — | 0.16% | — | -475,361 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Soleus Capital Management, L.P. | History | Closed out | 0 | 0 | — | 0.03% | — | -299,711 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Hudson Bay Capital Management LP | History | Closed out | 0 | 0 | — | 0.0% | — | -265,000 | -100.0% | Q3 2025 | Dec 15, 2025 |
| Knoll Capital Management, LLC | History | Closed out | 0 | 0 | — | 0.29% | — | -260,470 | -100.0% | Q3 2025 | Nov 14, 2025 |
| XTX Topco Ltd | History | Closed out | 0 | 0 | — | 0.02% | — | -191,037 | -100.0% | Q3 2025 | Nov 14, 2025 |
| CANTOR FITZGERALD, L. P. | History | Closed out | 0 | 0 | — | 0.0% | — | -110,000 | -100.0% | Q3 2025 | Feb 17, 2026 |
| NOMURA HOLDINGS INC | History | Closed out | 0 | 0 | — | 0.0% | — | -103,800 | -100.0% | Q3 2025 | Nov 14, 2025 |
| GSA CAPITAL PARTNERS LLP | History | Closed out | 0 | 0 | — | 0.01% | — | -58,145 | -100.0% | Q3 2025 | Nov 07, 2025 |
| Avanza Fonder AB | History | Closed out | 0 | 0 | — | 0.0% | — | -38,235 | -100.0% | Q3 2025 | Oct 16, 2025 |
| HRT FINANCIAL LP | History | Closed out | 0 | 0 | — | 0.0% | — | -34,852 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Forefront Wealth Partners, LLC | History | Closed out | 0 | 0 | — | 0.02% | — | -33,180 | -100.0% | Q3 2025 | Oct 20, 2025 |
| Squarepoint Ops LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -30,055 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Federation des caisses Desjardins du Quebec | History | Closed out | 0 | 0 | — | 0.0% | — | -21,271 | -100.0% | Q3 2025 | Nov 14, 2025 |
| Golden State Equity Partners | History | Closed out | 0 | 0 | — | 0.01% | — | -19,900 | -100.0% | Q3 2025 | Oct 21, 2025 |
| Virtu Financial LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -15,970 | -100.0% | Q3 2025 | Nov 14, 2025 |
| State of New Jersey Common Pension Fund D | History | Closed out | 0 | 0 | — | 0.0% | — | -15,644 | -100.0% | Q3 2025 | Nov 07, 2025 |
| Scientech Research LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -10,124 | -100.0% | Q3 2025 | Nov 14, 2025 |
| LEVEL FOUR ADVISORY SERVICES, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -10,000 | -100.0% | Q3 2025 | Nov 12, 2025 |
| OSAIC HOLDINGS, INC. | History | Reduced | 500 | 0 | — | 0.0% | — | -5,177 | -91.19% | Q4 2025 | Feb 17, 2026 |
| Allworth Financial LP | History | New | 1,611 | 0 | — | — | — | +1,611 | New | Q4 2025 | Feb 05, 2026 |
| WELLS FARGO & COMPANY/MN | History | Added to | 1,737 | 0 | — | — | — | +1,507 | 655.22% | Q4 2025 | Feb 13, 2026 |
| GPS Wealth Strategies Group, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,500 | -100.0% | Q3 2025 | Nov 03, 2025 |
| Wealthspire Advisors, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,026 | -100.0% | Q3 2025 | Nov 14, 2025 |
| SageView Advisory Group, LLC | History | New | 161 | 0 | — | — | — | +161 | New | Q4 2025 | Feb 17, 2026 |
| PRINCIPAL SECURITIES, INC. | History | Closed out | 0 | 0 | — | — | — | -75 | -100.0% | Q3 2025 | Nov 12, 2025 |
| Farther Finance Advisors, LLC | History | New | 17 | 0 | — | — | — | +17 | New | Q4 2025 | Jan 23, 2026 |
| US BANCORP \DE\ | History | No change | 13 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Jan 30, 2026 |
| SIT INVESTMENT ASSOCIATES INC | History | No change | 970 | 0 | — | 0.0% | — | 0 | 0.0% | Q4 2025 | Feb 25, 2026 |
| MAI Capital Management | History | No change | 309 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 3 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| EverSource Wealth Advisors, LLC | History | No change | 417 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 06, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 2,000 | 0 | — | 0.0% | — | 0 | 0.0% | Q4 2025 | Mar 16, 2026 |
| New England Capital Financial Advisors LLC | History | No change | 300 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 02, 2026 |