Mereo BioPharma Group plc - MREO
Detailed investor-level table based on 13F positions.
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 | 5,051 | 0.05% | 0.08% | 1 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| EcoR1 Capital, LLC | History | Added to | 13,368,855 | 4,411 | 0.19% | 0.15% | 2 | +5,512,389 | 70.16% | Q1 2026 | May 15, 2026 |
| 683 Capital Management, LLC | History | Reduced | 12,000,000 | 3,960 | 0.21% | 0.27% | 3 | -3,025,000 | -20.13% | Q1 2026 | May 15, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 8,195,287 | 2,704 | 0.0% | 0.0% | 4 | +8,169,795 | 32048.47% | Q1 2026 | May 15, 2026 |
| Defilade Capital Management, L.P. | History | New | 7,558,756 | 2,494 | 0.35% | — | 5 | +7,558,756 | New | Q1 2026 | May 14, 2026 |
| Newtyn Management, LLC | History | Added to | 7,079,056 | 2,336 | 0.25% | 0.01% | 6 | +6,854,434 | 3051.54% | Q1 2026 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | History | Added to | 3,559,103 | 1,174 | 0.0% | 0.0% | 7 | +3,475,457 | 4154.96% | Q1 2026 | May 15, 2026 |
| Tejara Capital Ltd | History | Reduced | 2,037,520 | 672 | 0.22% | 0.21% | 8 | -122,161 | -5.66% | Q1 2026 | May 12, 2026 |
| UBS Group AG | History | Reduced | 1,490,128 | 491 | 0.0% | 0.0% | 9 | -68,803 | -4.41% | Q1 2026 | May 05, 2026 |
| Wealthspire Advisors, LLC | History | New | 796,036 | 262 | 0.0% | — | 10 | +796,036 | New | Q1 2026 | May 01, 2026 |
| MARSHALL WACE, LLP | History | New | 686,987 | 226 | 0.0% | — | 11 | +686,987 | New | Q1 2026 | May 14, 2026 |
| CITADEL ADVISORS LLC | History | Reduced | 454,800 | 150 | 0.0% | 0.0% | 12 | -293,900 | -39.25% | Q1 2026 | May 15, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Reduced | 443,920 | 146 | 0.0% | 0.0% | 13 | -250,180 | -36.04% | Q1 2026 | May 15, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 333,773 | 110 | 0.0% | 0.0% | 15 | -539,931 | -61.8% | Q1 2026 | May 12, 2026 |
| GROUP ONE TRADING LLC | History | Reduced | 335,827 | 110 | 0.0% | 0.0% | 14 | -105,809 | -23.96% | Q1 2026 | May 13, 2026 |
| Rangeley Capital, LLC | History | Reduced | 329,200 | 108 | 0.1% | 0.13% | 16 | -34,800 | -9.56% | Q1 2026 | May 15, 2026 |
| TWO SIGMA ADVISERS, LP | History | No change | 251,900 | 104 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| BlackRock, Inc. | History | Reduced | 302,991 | 99 | 0.0% | 0.0% | 19 | -9,622 | -3.08% | Q1 2026 | May 13, 2026 |
| Knott David M Jr | History | No change | 300,337 | 99 | 0.06% | 0.06% | 18 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Added to | 209,084 | 68 | 0.0% | 0.0% | 20 | +147,649 | 240.33% | Q1 2026 | May 13, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Reduced | 187,839 | 61 | 0.0% | 0.0% | 21 | -337,286 | -64.23% | Q1 2026 | May 15, 2026 |
| ADAR1 Capital Management, LLC | History | No change | 150,000 | 49 | 0.0% | 0.0% | 22 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| STATE STREET CORP | History | Added to | 133,379 | 44 | 0.0% | 0.0% | 23 | +2,736 | 2.09% | Q1 2026 | May 15, 2026 |
| Forefront Analytics, LLC | History | Added to | 127,778 | 42 | 0.04% | 0.01% | 24 | +96,010 | 302.22% | Q1 2026 | May 13, 2026 |
| Virtus Investment Advisers, LLC | History | Added to | 125,662 | 41 | 0.01% | 0.01% | 25 | +3,067 | 2.5% | Q1 2026 | May 14, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | No change | 92,534 | 30 | 0.0% | 0.0% | 26 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| XTX Topco Ltd | History | New | 84,469 | 27 | 0.0% | — | 27 | +84,469 | New | Q1 2026 | May 15, 2026 |
| Caption Management, LLC | History | Added to | 64,064 | 21 | 0.0% | 0.0% | 28 | +14,064 | 28.13% | Q1 2026 | May 15, 2026 |
| SmartHarvest Portfolios, LLC | History | Added to | 49,512 | 16 | 0.01% | 0.0% | 29 | +29,222 | 144.02% | Q1 2026 | Apr 20, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Reduced | 48,400 | 15 | 0.0% | 0.0% | 30 | -145,971 | -75.1% | Q1 2026 | May 14, 2026 |
| StoneX Group Inc. | History | New | 36,873 | 12 | 0.0% | — | 31 | +36,873 | New | Q1 2026 | May 14, 2026 |
| Virtu Financial LLC | History | New | 36,458 | 12 | 0.0% | — | 32 | +36,458 | New | Q1 2026 | May 14, 2026 |
| Independent Advisor Alliance | History | New | 35,227 | 11 | 0.0% | — | 34 | +35,227 | New | Q1 2026 | May 12, 2026 |
| Clear Harbor Asset Management, LLC | History | No change | 35,000 | 11 | 0.0% | 0.0% | 33 | 0 | 0.0% | Q1 2026 | May 05, 2026 |
| Significant Wealth Partners LLC | History | Added to | 25,634 | 8 | 0.01% | 0.01% | 36 | +3,945 | 18.19% | Q1 2026 | Apr 08, 2026 |
| Centiva Capital, LP | History | No change | 25,000 | 8 | 0.0% | 0.0% | 35 | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| Engineers Gate Manager LP | History | Reduced | 23,954 | 7 | 0.0% | 0.0% | 37 | -25,844 | -51.9% | Q1 2026 | May 15, 2026 |
| JPMORGAN CHASE & CO | History | New | 21,848 | 6 | 0.0% | — | 43 | +21,848 | New | Q1 2026 | May 13, 2026 |
| GAMMA Investing LLC | History | Added to | 19,274 | 6 | 0.0% | 0.0% | 41 | +9,713 | 101.59% | Q1 2026 | Apr 06, 2026 |
| NFSG Corp | History | Added to | 18,750 | 6 | 0.0% | 0.0% | 40 | +1,750 | 10.29% | Q1 2026 | May 05, 2026 |
| RHUMBLINE ADVISERS | History | Added to | 19,572 | 6 | 0.0% | 0.0% | 38 | +426 | 2.23% | Q1 2026 | May 12, 2026 |
| OneDigital Investment Advisors LLC | History | No change | 18,300 | 6 | 0.0% | 0.0% | 39 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| Three Magnolias Financial Advisors, LLC | History | No change | 19,000 | 6 | 0.0% | 0.0% | 42 | 0 | 0.0% | Q1 2026 | Apr 23, 2026 |
| MORGAN STANLEY | History | Reduced | 16,425 | 5 | 0.0% | 0.0% | 44 | -1,257,360 | -98.71% | Q1 2026 | May 15, 2026 |
| IHT Wealth Management, LLC | History | New | 15,000 | 4 | 0.0% | — | 46 | +15,000 | New | Q1 2026 | May 15, 2026 |
| MML INVESTORS SERVICES, LLC | History | No change | 12,200 | 4 | 0.0% | 0.0% | 45 | 0 | 0.0% | Q1 2026 | May 04, 2026 |
| World Investment Advisors | History | New | 10,000 | 3 | 0.0% | — | 47 | +10,000 | New | Q1 2026 | Apr 27, 2026 |
| Baader Bank Aktiengesellschaft | History | Reduced | 12,330 | 2 | 0.0% | 0.0% | 48 | -116,412 | -90.42% | Q1 2026 | May 08, 2026 |
| Astoria Portfolio Advisors LLC. | History | No change | 10,000 | 2 | 0.0% | 0.0% | 49 | 0 | 0.0% | Q1 2026 | Apr 28, 2026 |
| Arax Advisory Partners | History | No change | 4,000 | 1 | 0.0% | 0.0% | 50 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| Schonfeld Strategic Advisors LLC | History | Closed out | 0 | 0 | — | 0.01% | — | -6,090,381 | -100.0% | Q1 2026 | May 15, 2026 |
| DIADEMA PARTNERS LP | History | Closed out | 0 | 0 | — | 0.14% | — | -1,999,500 | -100.0% | Q1 2026 | May 15, 2026 |
| Logos Global Management LP | History | Closed out | 0 | 0 | — | 0.05% | — | -1,850,000 | -100.0% | Q1 2026 | May 15, 2026 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -1,763,666 | -100.0% | Q1 2026 | May 13, 2026 |
| Monaco Asset Management SAM | History | Closed out | 0 | 0 | — | 0.11% | — | -1,585,214 | -100.0% | Q1 2026 | May 11, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -1,280,275 | -100.0% | Q1 2026 | May 15, 2026 |
| DLD Asset Management, LP | History | Closed out | 0 | 0 | — | 0.02% | — | -746,000 | -100.0% | Q1 2026 | May 13, 2026 |
| SIMPLEX TRADING, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -419,477 | -100.0% | Q1 2026 | May 14, 2026 |
| EntryPoint Capital, LLC | History | Closed out | 0 | 0 | — | 0.06% | — | -400,700 | -100.0% | Q1 2026 | May 14, 2026 |
| LUMINUS MANAGEMENT LLC | History | Closed out | 0 | 0 | — | 0.14% | — | -395,000 | -100.0% | Q1 2026 | May 15, 2026 |
| Quadrature Capital Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -266,731 | -100.0% | Q1 2026 | May 15, 2026 |
| SPHERA FUNDS MANAGEMENT LTD. | History | Closed out | 0 | 0 | — | 0.02% | — | -255,400 | -100.0% | Q1 2026 | May 15, 2026 |
| CITIGROUP INC | History | Closed out | 0 | 0 | — | 0.0% | — | -195,814 | -100.0% | Q1 2026 | May 11, 2026 |
| Graham Capital Management, L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -116,286 | -100.0% | Q1 2026 | May 15, 2026 |
| GOLDMAN SACHS GROUP INC | History | Closed out | 0 | 0 | — | 0.0% | — | -28,026 | -100.0% | Q1 2026 | May 15, 2026 |
| Aquatic Capital Management LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -21,216 | -100.0% | Q1 2026 | May 15, 2026 |
| BARCLAYS PLC | History | Reduced | 2,496 | 0 | — | 0.0% | — | -17,604 | -87.58% | Q1 2026 | May 14, 2026 |
| PFG Investments, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -16,650 | -100.0% | Q1 2026 | Apr 27, 2026 |
| QRG CAPITAL MANAGEMENT, INC. | History | Closed out | 0 | 0 | — | 0.0% | — | -13,503 | -100.0% | Q1 2026 | Apr 27, 2026 |
| AE Wealth Management LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -12,563 | -100.0% | Q1 2026 | May 13, 2026 |
| TORONTO DOMINION BANK | History | Closed out | 0 | 0 | — | 0.0% | — | -5,500 | -100.0% | Q1 2026 | May 15, 2026 |
| Caitong International Asset Management Co., Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -4,462 | -100.0% | Q1 2026 | May 11, 2026 |
| WELLS FARGO & COMPANY/MN | History | Reduced | 230 | 0 | — | — | — | -1,507 | -86.76% | Q1 2026 | May 11, 2026 |
| OSAIC HOLDINGS, INC. | History | Added to | 1,500 | 0 | — | — | — | +1,000 | 200.0% | Q1 2026 | May 15, 2026 |
| EverSource Wealth Advisors, LLC | History | Reduced | 100 | 0 | — | — | — | -317 | -76.02% | Q1 2026 | May 15, 2026 |
| SBI Securities Co., Ltd. | History | New | 114 | 0 | — | — | — | +114 | New | Q1 2026 | Apr 27, 2026 |
| Allworth Financial LP | History | Reduced | 1,500 | 0 | — | — | — | -111 | -6.89% | Q1 2026 | May 14, 2026 |
| Sound Income Strategies, LLC | History | New | 66 | 0 | — | — | — | +66 | New | Q1 2026 | Apr 27, 2026 |
| NATIONAL BANK OF CANADA /FI/ | History | New | 46 | 0 | — | — | — | +46 | New | Q1 2026 | May 14, 2026 |
| Farther Finance Advisors, LLC | History | Closed out | 0 | 0 | — | — | — | -17 | -100.0% | Q1 2026 | Apr 07, 2026 |
| Axiom Investment Management LLC | History | New | 1 | 0 | — | — | — | +1 | New | Q1 2026 | May 26, 2026 |
| US BANCORP \DE\ | History | No change | 13 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| SIT INVESTMENT ASSOCIATES INC | History | No change | 970 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| MAI Capital Management | History | No change | 309 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 3 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 2,000 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 14, 2026 |
| SageView Advisory Group, LLC | History | No change | 161 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| New England Capital Financial Advisors LLC | History | No change | 300 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | Apr 27, 2026 |