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 | 4,863 | 0.04% | 0.04% | 1 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| 683 Capital Management, LLC | History | No change | 11,777,856 | 3,741 | 0.18% | 0.18% | 2 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| BANK OF AMERICA CORP /DE/ | History | No change | 8,195,281 | 2,597 | 0.0% | 0.0% | 3 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Defilade Capital Management, L.P. | History | No change | 7,558,756 | 2,401 | 0.32% | 0.32% | 4 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Newtyn Management, LLC | History | No change | 3,000,000 | 953 | 0.12% | 0.12% | 5 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Tejara Capital Ltd | History | No change | 2,037,520 | 647 | 0.27% | 0.27% | 6 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| UBS Group AG | History | No change | 1,447,627 | 460 | 0.0% | 0.0% | 7 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | No change | 1,319,241 | 419 | 0.0% | 0.0% | 8 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| CITADEL ADVISORS LLC | History | No change | 1,000,058 | 317 | 0.0% | 0.0% | 9 | 0 | 0.0% | Q2 2026 | Sep 02, 2026 |
| EcoR1 Capital, LLC | History | No change | 1,000,000 | 317 | 0.02% | 0.02% | 10 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| JANE STREET GROUP, LLC | History | No change | 786,744 | 249 | 0.0% | 0.0% | 11 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Ishara Investments LP | History | No change | 768,750 | 244 | 0.18% | 0.18% | 12 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Wealthspire Advisors, LLC | History | No change | 765,000 | 243 | 0.0% | 0.0% | 13 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | No change | 432,770 | 137 | 0.0% | 0.0% | 14 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Rangeley Capital, LLC | History | No change | 329,200 | 104 | 0.1% | 0.1% | 15 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| MARSHALL WACE, LLP | History | No change | 179,884 | 57 | 0.0% | 0.0% | 16 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| XTX Topco Ltd | History | No change | 174,481 | 55 | 0.0% | 0.0% | 17 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| GROUP ONE TRADING LLC | History | No change | 167,515 | 53 | 0.0% | 0.0% | 18 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| STATE STREET CORP | History | No change | 134,772 | 42 | 0.0% | 0.0% | 19 | 0 | 0.0% | Q2 2026 | Sep 22, 2026 |
| James J. Burns & Company, LLC | History | No change | 95,400 | 38 | 0.0% | 0.0% | 20 | 0 | 0.0% | Q3 2026 | Oct 22, 2026 |
| Clear Harbor Asset Management, LLC | History | Added to | 85,500 | 34 | 0.0% | 0.0% | 21 | +53,500 | 167.19% | Q3 2026 | Nov 05, 2026 |
| NOMURA HOLDINGS INC | History | No change | 104,361 | 33 | 0.0% | 0.0% | 22 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Quarry LP | History | No change | 93,750 | 29 | 0.0% | 0.0% | 23 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| GOLDMAN SACHS GROUP INC | History | No change | 85,180 | 27 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| JMN Financial LLC | History | No change | 76,748 | 24 | 0.02% | 0.02% | 25 | 0 | 0.0% | Q2 2026 | Aug 10, 2026 |
| BlackRock, Inc. | History | No change | 69,678 | 22 | 0.0% | 0.0% | 26 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| JPMORGAN CHASE & CO | History | No change | 58,531 | 19 | 0.0% | 0.0% | 27 | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| Virtu Financial LLC | History | No change | 61,285 | 19 | 0.0% | 0.0% | 28 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | No change | 52,100 | 16 | 0.0% | 0.0% | 29 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Significant Wealth Partners LLC | History | No change | 32,677 | 10 | 0.01% | 0.01% | 30 | 0 | 0.0% | Q2 2026 | Jul 14, 2026 |
| RHUMBLINE ADVISERS | History | No change | 26,784 | 8 | 0.0% | 0.0% | 31 | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| Engineers Gate Manager LP | History | No change | 23,953 | 7 | 0.0% | 0.0% | 32 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| Centiva Capital, LP | History | No change | 25,000 | 7 | 0.0% | 0.0% | 33 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| NFSG Corp | History | No change | 18,750 | 7 | 0.0% | 0.0% | 34 | 0 | 0.0% | Q3 2026 | Oct 15, 2026 |
| MORGAN STANLEY | History | No change | 16,731 | 5 | 0.0% | 0.0% | 35 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| OneDigital Investment Advisors LLC | History | No change | 18,300 | 5 | 0.0% | 0.0% | 36 | 0 | 0.0% | Q2 2026 | Aug 06, 2026 |
| StoneX Group Inc. | History | New | 15,479 | 4 | 0.0% | — | 41 | +15,479 | New | Q3 2026 | Nov 03, 2026 |
| SIMPLEX TRADING, LLC | History | Reduced | 12,070 | 4 | 0.0% | 0.0% | 39 | -6,710 | -35.73% | Q3 2026 | Nov 04, 2026 |
| SG Americas Securities, LLC | History | No change | 12,802 | 4 | 0.0% | 0.0% | 37 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| TWO SIGMA SECURITIES, LLC | History | No change | 12,900 | 4 | 0.0% | 0.0% | 38 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| IHT Wealth Management, LLC | History | No change | 15,000 | 4 | 0.0% | 0.0% | 40 | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| CITIGROUP INC | History | Added to | 8,675 | 3 | 0.0% | — | 43 | +8,623 | 16582.69% | Q3 2026 | Nov 04, 2026 |
| MML INVESTORS SERVICES, LLC | History | No change | 12,200 | 3 | 0.0% | 0.0% | 42 | 0 | 0.0% | Q2 2026 | Aug 07, 2026 |
| World Investment Advisors | History | No change | 10,000 | 3 | 0.0% | 0.0% | 44 | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Astoria Portfolio Advisors LLC. | History | No change | 10,000 | 3 | 0.0% | 0.0% | 45 | 0 | 0.0% | Q2 2026 | Jul 28, 2026 |
| Arax Advisory Partners | History | No change | 5,819 | 1 | 0.0% | 0.0% | 46 | 0 | 0.0% | Q2 2026 | Aug 10, 2026 |
| J. Safra Sarasin Holding AG | History | Closed out | 0 | 0 | — | 0.0% | — | -12,841 | -100.0% | Q3 2026 | Oct 26, 2026 |
| GAMMA Investing LLC | History | Reduced | 1,991 | 0 | — | 0.0% | — | -7,317 | -78.61% | Q3 2026 | Oct 08, 2026 |
| SBI Securities Co., Ltd. | History | Closed out | 0 | 0 | — | — | — | -114 | -100.0% | Q3 2026 | Oct 21, 2026 |
| Axiom Investment Management LLC | History | Closed out | 0 | 0 | — | — | — | -1 | -100.0% | Q3 2026 | Nov 03, 2026 |
| Caitong International Asset Management Co., Ltd | History | Closed out | 0 | 0 | — | — | — | -1 | -100.0% | Q3 2026 | Oct 29, 2026 |
| US BANCORP \DE\ | History | No change | 13 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| WELLS FARGO & COMPANY/MN | History | No change | 231 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| SIT INVESTMENT ASSOCIATES INC | History | No change | 970 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 12, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 3 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| Allworth Financial LP | History | No change | 1,500 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 11, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 1,500 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 14, 2026 |
| EverSource Wealth Advisors, LLC | History | No change | 100 | 0 | — | — | — | 0 | 0.0% | Q3 2026 | Nov 04, 2026 |
| Rockefeller Capital Management L.P. | History | No change | 2,000 | 0 | — | — | — | 0 | 0.0% | Q2 2026 | Aug 13, 2026 |
| New England Capital Financial Advisors LLC | History | No change | 300 | 0 | — | — | — | 0 | 0.0% | Q3 2026 | Nov 03, 2026 |
| Markowski Investments | History | No change | 1,500 | 0 | — | — | — | 0 | 0.0% | Q3 2026 | Oct 30, 2026 |