Mereo Biopharma Group PL-ADRMREO
13F holders, Q2 2026 (June 30)60holders −3
13new positions
17sold out
2famous investors
$0.32avg. 13F price*
At the end of Q2 2026, 60 institutions reported holding Mereo Biopharma Group PL-ADR (MREO) in their 13F filings, down 3 from Q1 2026. 13 opened new positions and 17 sold out. The largest holders were Rubric Capital Management LP ($4.9M), 683 Capital Management, LLC ($3.7M) and Bank of America Corp. ($2.6M). 2 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Mereo Biopharma Group PL-ADR
- CUSIP
- 589492107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 13 | $548K |
| Exits | 17 | $1.6M |
All 13F filers, Q1 2026 → Q2 2026: 3,682,442 shares bought and 22,449,714 shares sold, net −18,767,272 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 60 holders
| Rubric Capital Management LP | 0.04% | No change | 15,307,347 | $4.9M |
| 683 Capital Management, LLC | 0.36% | Reduce -1.9% | 11,777,856 | $3.7M |
| Bank of America Corp. | 0.00% | Reduce 0.0% | 8,195,281 | $2.6M |
| Defilade Capital Management, L.P. | 0.32% | No change | 7,558,756 | $2.4M |
| Newtyn Management, LLC | 0.12% | Reduce -57.6% | 3,000,000 | $953K |
| Tejara Capital Ltd | 0.27% | No change | 2,037,520 | $647K |
| UBS Group AG | 0.00% | Reduce -2.9% | 1,447,627 | $460K |
| Two Sigma Investments, LP | 0.00% | Add +602.3% | 1,319,241 | $419K |
| EcoR1 Capital, LLC | 0.02% | Reduce -92.5% | 1,000,000 | $318K |
| Jane Street Group, LLC | 0.00% | Add +453.6% | 774,944 | $246K |
| Ishara Investments LP | 0.18% | New | 768,750 | $244K |
| Wealthspire Advisors, LLC | 0.00% | Reduce -3.9% | 765,000 | $243K |
| Citadel Advisors | 0.00% | New | 444,158 | $141K |
| Rangeley Capital, LLC | 0.10% | No change | 329,200 | $105K |
| Susquehanna International Group, LLP | 0.00% | Add +8.9% | 213,270 | $68K |
| Marshall Wace, LLP | 0.00% | Reduce -73.8% | 179,884 | $58K |
| XTX Topco Ltd | 0.00% | Add +106.6% | 174,481 | $55K |
| Group One Trading LLC | 0.00% | Reduce -50.1% | 167,515 | $53K |
| State Street Corp. | 0.00% | Add +1.0% | 134,772 | $43K |
| Nomura Holdings Inc. | 0.00% | New | 104,361 | $33K |
| James J. Burns & Company, LLC | 0.00% | New | 95,400 | $30K |
| Quarry LP | 0.00% | New | 93,750 | $30K |
| Goldman Sachs Group Inc. | 0.00% | New | 85,180 | $27K |
| JMN Financial LLC | 0.02% | New | 76,748 | $24K |
| BlackRock, Inc. | 0.00% | Reduce -77.0% | 69,678 | $22K |
| JPMorgan Chase & Co. | 0.00% | Add +167.9% | 58,531 | $19K |
| Virtu Financial LLC | 0.00% | Add +68.1% | 61,285 | $19K |
| Renaissance Technologies | 0.00% | Add +7.6% | 52,100 | $17K |
| Significant Wealth Partners LLC | 0.01% | Add +27.5% | 32,677 | $10K |
| Clear Harbor Asset Management, LLC | 0.00% | Reduce -8.6% | 32,000 | $10K |
| Rhumbline Advisers | 0.00% | Add +36.9% | 26,784 | $9K |
| Centiva Capital, LP | 0.00% | No change | 25,000 | $8K |
| Engineers Gate Manager LP | 0.00% | Reduce 0.0% | 23,953 | $8K |
| Simplex Trading, LLC | 0.00% | New | 18,780 | $6K |
| NFSG Corp | 0.00% | No change | 18,750 | $6K |
| OneDigital Investment Advisors LLC | 0.00% | No change | 18,300 | $6K |
| Morgan Stanley | 0.00% | Add +1.9% | 16,731 | $5K |
| IHT Wealth Management, LLC | 0.00% | No change | 15,000 | $5K |
| Two Sigma Securities, LLC | 0.00% | New | 12,900 | $4K |
| J. Safra Sarasin Holding AG | 0.00% | New | 12,841 | $4K |
| SG Americas Securities, LLC | 0.00% | New | 12,802 | $4K |
| MML Investors Services, LLC | 0.00% | No change | 12,200 | $4K |
| World Investment Advisors | 0.00% | No change | 10,000 | $3K |
| Astoria Portfolio Advisors LLC. | 0.00% | No change | 10,000 | $3K |
| GAMMA Investing LLC | 0.00% | Reduce -51.7% | 9,308 | $3K |
| Arax Advisory Partners | 0.00% | Add +45.5% | 5,819 | $2K |
| Rockefeller Capital Management L.P. | 0.00% | No change | 2,000 | $635 |
| Osaic Holdings, Inc. | 0.00% | No change | 1,500 | $479 |
| Markowski Investments | 0.00% | — | 1,500 | $477 |
| Allworth Financial LP | 0.00% | No change | 1,500 | $477 |
| New England Capital Financial Advisors LLC | 0.00% | No change | 300 | $96 |
| Wells Fargo & Company | 0.00% | Add +0.4% | 231 | $73 |
| SBI Securities Co., Ltd. | 0.00% | No change | 114 | $36 |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 100 | $32 |
| Citigroup Inc. | 0.00% | New | 52 | $17 |
| US Bancorp \de | 0.00% | No change | 13 | $4 |
| BNP Paribas Financial Markets | 0.00% | No change | 3 | $1 |
| Sit Investment Associates Inc. | 0.00% | No change | 970 | $0 |
| Axiom Investment Management LLC | 0.00% | No change | 1 | $0 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 1 | $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.