Mereo Biopharma Group PL-ADRMREO
13F holders, Q1 2026 (March 31)63holders −7
14new positions
21sold out
2famous investors
$0.33avg. 13F price*
At the end of Q1 2026, 63 institutions reported holding Mereo Biopharma Group PL-ADR (MREO) in their 13F filings, down 7 from Q4 2025. 14 opened new positions and 21 sold out. The largest holders were Rubric Capital Management LP ($5.1M), EcoR1 Capital, LLC ($4.4M) and 683 Capital Management, LLC ($4.0M). 2 famous investors held it, including Israel Englander (0.0% of Millennium Management'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 Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 14 | $3.1M |
| Exits | 21 | $6.1M |
All 13F filers, Q4 2025 → Q1 2026: 33,799,457 shares bought and 20,197,849 shares sold, net +13,601,608 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 63 holders
| Rubric Capital Management LP | 0.06% | No change | 15,307,347 | $5.1M |
| EcoR1 Capital, LLC | 0.19% | Add +70.2% | 13,368,855 | $4.4M |
| 683 Capital Management, LLC | 0.39% | Reduce -20.1% | 12,000,000 | $4.0M |
| Bank of America Corp. | 0.00% | Add +32048.5% | 8,195,287 | $2.7M |
| Defilade Capital Management, L.P. | 0.35% | New | 7,558,756 | $2.5M |
| Newtyn Management, LLC | 0.25% | Add +3051.5% | 7,079,056 | $2.3M |
| Millennium Management | 0.00% | Add +4155.0% | 3,559,103 | $1.2M |
| Tejara Capital Ltd | 0.22% | Reduce -5.7% | 2,037,520 | $672K |
| UBS Group AG | 0.00% | Reduce -4.4% | 1,490,128 | $492K |
| Wealthspire Advisors, LLC | 0.00% | New | 796,036 | $263K |
| Marshall Wace, LLP | 0.00% | New | 686,987 | $227K |
| Group One Trading LLC | 0.00% | Reduce -24.0% | 335,827 | $111K |
| Rangeley Capital, LLC | 0.12% | Reduce -9.6% | 329,200 | $109K |
| BlackRock, Inc. | 0.00% | Reduce -3.1% | 302,991 | $100K |
| Knott David M Jr | 0.06% | No change | 300,337 | $99K |
| Acadian Asset Management LLC | 0.00% | Add +240.3% | 209,084 | $68K |
| Susquehanna International Group, LLP | 0.00% | New | 195,920 | $65K |
| Two Sigma Investments, LP | 0.00% | Reduce -64.2% | 187,839 | $62K |
| ADAR1 Capital Management, LLC | 0.00% | No change | 150,000 | $50K |
| Jane Street Group, LLC | 0.00% | Reduce -60.7% | 139,973 | $46K |
| State Street Corp. | 0.00% | Add +2.1% | 133,379 | $44K |
| Forefront Analytics, LLC | 0.04% | Add +302.2% | 127,778 | $42K |
| Virtus Investment Advisers, LLC | 0.01% | Add +2.5% | 125,662 | $41K |
| Geode Capital Management, LLC | 0.00% | No change | 92,534 | $31K |
| XTX Topco Ltd | 0.00% | New | 84,469 | $28K |
| Caption Management, LLC | 0.00% | Add +28.1% | 64,064 | $21K |
| SmartHarvest Portfolios, LLC | 0.01% | Add +144.0% | 49,512 | $16K |
| Renaissance Technologies | 0.00% | Reduce -75.1% | 48,400 | $16K |
| StoneX Group Inc. | 0.00% | New | 36,873 | $12K |
| Virtu Financial LLC | 0.00% | New | 36,458 | $12K |
| Independent Advisor Alliance | 0.00% | New | 35,227 | $12K |
| Clear Harbor Asset Management, LLC | 0.00% | No change | 35,000 | $12K |
| Significant Wealth Partners LLC | 0.01% | Add +18.2% | 25,634 | $8K |
| Centiva Capital, LP | 0.00% | No change | 25,000 | $8K |
| Engineers Gate Manager LP | 0.00% | Reduce -51.9% | 23,954 | $8K |
| JPMorgan Chase & Co. | 0.00% | New | 21,848 | $7K |
| Rhumbline Advisers | 0.00% | Add +2.2% | 19,572 | $6K |
| GAMMA Investing LLC | 0.00% | Add +101.6% | 19,274 | $6K |
| Three Magnolias Financial Advisors, LLC | 0.00% | No change | 19,000 | $6K |
| NFSG Corp | 0.00% | Add +10.3% | 18,750 | $6K |
| OneDigital Investment Advisors LLC | 0.00% | No change | 18,300 | $6K |
| Morgan Stanley | 0.00% | Reduce -98.7% | 16,425 | $5K |
| IHT Wealth Management, LLC | 0.00% | New | 15,000 | $5K |
| MML Investors Services, LLC | 0.00% | No change | 12,200 | $4K |
| World Investment Advisors | 0.00% | New | 10,000 | $3K |
| Astoria Portfolio Advisors LLC. | 0.00% | No change | 10,000 | $3K |
| Baader Bank Aktiengesellschaft | 0.00% | Reduce -90.4% | 12,330 | $3K |
| Arax Advisory Partners | 0.00% | No change | 4,000 | $1K |
| Barclays PLC | 0.00% | Reduce -82.8% | 2,496 | $824 |
| Rockefeller Capital Management L.P. | 0.00% | No change | 2,000 | $660 |
| Allworth Financial LP | 0.00% | Reduce -6.9% | 1,500 | $495 |
| Osaic Holdings, Inc. | 0.00% | Add +200.0% | 1,500 | $495 |
| MAI Capital Management | 0.00% | No change | 309 | $102 |
| New England Capital Financial Advisors LLC | 0.00% | No change | 300 | $99 |
| Wells Fargo & Company | 0.00% | Reduce -86.8% | 230 | $76 |
| SBI Securities Co., Ltd. | 0.00% | New | 114 | $38 |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -76.0% | 100 | $33 |
| Sound Income Strategies, LLC | 0.00% | New | 66 | $22 |
| National Bank of Canada | 0.00% | New | 46 | $15 |
| 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% | — | 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.