Mereo Biopharma Group PL-ADRMREO
13F holders, Q4 2025 (December 31)70holders −14
21new positions
35sold out
2famous investors
$0.42avg. 13F price*
At the end of Q4 2025, 70 institutions reported holding Mereo Biopharma Group PL-ADR (MREO) in their 13F filings, down 14 from Q3 2025. 21 opened new positions and 35 sold out. The largest holders were Rubric Capital Management LP ($6.4M), 683 Capital Management, LLC ($6.3M) and EcoR1 Capital, LLC ($3.3M). 2 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Mereo Biopharma Group PL-ADR
- CUSIP
- 589492107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 21 | $4.9M |
| Exits | 35 | $124.5M |
All 13F filers, Q3 2025 → Q4 2025: 29,725,905 shares bought and 67,935,095 shares sold, net −38,209,190 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 70 holders
| Rubric Capital Management LP | 0.08% | No change | 15,307,347 | $6.4M |
| 683 Capital Management, LLC | 0.55% | Add +208.2% | 15,025,000 | $6.3M |
| EcoR1 Capital, LLC | 0.15% | New | 7,856,466 | $3.3M |
| Schonfeld Strategic Advisors LLC | 0.01% | Add +251.5% | 6,090,381 | $2.5M |
| Tejara Capital Ltd | 0.37% | Add +13.3% | 2,159,681 | $900K |
| Logos Global Management LP | 0.05% | Add +270.0% | 1,850,000 | $771K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -7.5% | 1,763,666 | $735K |
| Monaco Asset Management SAM | 0.20% | Add +67.6% | 1,585,214 | $661K |
| UBS Group AG | 0.00% | Add +60.6% | 1,558,931 | $650K |
| Balyasny Asset Management L.P. | 0.00% | New | 1,280,275 | $533K |
| Morgan Stanley | 0.00% | Reduce -61.9% | 1,273,785 | $531K |
| Two Sigma Investments, LP | 0.00% | Reduce -51.7% | 525,125 | $219K |
| Group One Trading LLC | 0.01% | Add +223.3% | 441,636 | $184K |
| Simplex Trading, LLC | 0.00% | Add +113.7% | 419,477 | $175K |
| EntryPoint Capital, LLC | 0.07% | New | 400,700 | $167K |
| Luminus Management LLC | 0.15% | New | 395,000 | $165K |
| Rangeley Capital, LLC | 0.13% | New | 364,000 | $152K |
| Jane Street Group, LLC | 0.00% | Reduce -21.3% | 356,004 | $148K |
| BlackRock, Inc. | 0.00% | Reduce -29.6% | 312,613 | $130K |
| Knott David M Jr | 0.06% | No change | 300,337 | $125K |
| Quadrature Capital Ltd | 0.00% | New | 266,731 | $111K |
| Sphera Funds Management LTD. | 0.02% | New | 255,400 | $106K |
| Two Sigma Advisers, LP | 0.00% | Add +4.0% | 251,900 | $105K |
| Newtyn Management, LLC | 0.01% | New | 224,622 | $94K |
| Citigroup Inc. | 0.00% | New | 195,814 | $82K |
| Renaissance Technologies | 0.00% | Reduce -67.1% | 194,371 | $81K |
| ADAR1 Capital Management, LLC | 0.00% | New | 150,000 | $63K |
| State Street Corp. | 0.00% | Reduce -1.6% | 130,643 | $54K |
| Virtus Investment Advisers, LLC | 0.01% | Add +199.5% | 122,595 | $51K |
| Graham Capital Management, L.P. | 0.00% | New | 116,286 | $48K |
| Geode Capital Management, LLC | 0.00% | No change | 92,534 | $39K |
| Millennium Management | 0.00% | Reduce -75.2% | 83,646 | $35K |
| Baader Bank Aktiengesellschaft | 0.00% | New | 128,742 | $33K |
| Acadian Asset Management LLC | 0.00% | Reduce -76.0% | 61,435 | $24K |
| Caption Management, LLC | 0.00% | Reduce -73.7% | 50,000 | $21K |
| Engineers Gate Manager LP | 0.00% | New | 49,798 | $21K |
| Clear Harbor Asset Management, LLC | 0.00% | Reduce -54.5% | 35,000 | $15K |
| Forefront Analytics, LLC | 0.01% | Reduce -4.3% | 31,768 | $13K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -98.8% | 28,026 | $12K |
| Bank of America Corp. | 0.00% | Reduce -94.2% | 25,492 | $11K |
| Centiva Capital, LP | 0.00% | No change | 25,000 | $10K |
| Significant Wealth Partners LLC | 0.01% | Reduce -54.6% | 21,689 | $9K |
| Aquatic Capital Management LLC | 0.00% | Reduce -60.5% | 21,216 | $9K |
| SmartHarvest Portfolios, LLC | 0.00% | — | 20,290 | $8K |
| Rhumbline Advisers | 0.00% | Add +109.9% | 19,146 | $8K |
| Three Magnolias Financial Advisors, LLC | 0.00% | Reduce -48.6% | 19,000 | $8K |
| OneDigital Investment Advisors LLC | 0.00% | No change | 18,300 | $8K |
| NFSG Corp | 0.00% | Add +30.8% | 17,000 | $7K |
| PFG Investments, LLC | 0.00% | Reduce -2.9% | 16,650 | $7K |
| Barclays PLC | 0.00% | New | 14,500 | $6K |
| QRG Capital Management, Inc. | 0.00% | New | 13,503 | $6K |
| AE Wealth Management LLC | 0.00% | New | 12,563 | $5K |
| MML Investors Services, LLC | 0.00% | New | 12,200 | $5K |
| Astoria Portfolio Advisors LLC. | 0.00% | New | 10,000 | $4K |
| GAMMA Investing LLC | 0.00% | Add +4.1% | 9,561 | $4K |
| Toronto Dominion Bank | 0.00% | New | 5,500 | $2K |
| Arax Advisory Partners | 0.00% | No change | 4,000 | $2K |
| Caitong International Asset Management Co., Ltd | 0.00% | Reduce -73.7% | 2,231 | $930 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 2,000 | $833 |
| Wells Fargo & Company | 0.00% | Add +655.2% | 1,737 | $724 |
| Allworth Financial LP | 0.00% | Add +2.4% | 1,611 | $672 |
| Osaic Holdings, Inc. | 0.00% | Reduce -91.2% | 500 | $208 |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 417 | $174 |
| MAI Capital Management | 0.00% | No change | 309 | $129 |
| New England Capital Financial Advisors LLC | 0.00% | No change | 300 | $126 |
| SageView Advisory Group, LLC | 0.00% | New | 161 | $68 |
| Farther Finance Advisors, LLC | 0.00% | New | 17 | $7 |
| US Bancorp \de | 0.00% | No change | 13 | $5 |
| BNP Paribas Financial Markets | 0.00% | No change | 3 | $1 |
| Sit Investment Associates Inc. | 0.00% | No change | 970 | $0 |
"% of holder's portfolio" is MREO's weight in each manager's 13F, not the share of Mereo Biopharma Group PL-ADR the manager owns.