Mereo Biopharma Group PL-ADRMREO
13F holders, Q2 2025 (June 30)86holders −4
12new positions
16sold out
4famous investors
$2.71avg. 13F price*
At the end of Q2 2025, 86 institutions reported holding Mereo Biopharma Group PL-ADR (MREO) in their 13F filings, down 4 from Q1 2025. 12 opened new positions and 16 sold out. The largest holders were Janus Henderson Group PLC ($48.1M), Rubric Capital Management LP ($41.5M) and Frazier Life Sciences Management, L.P. ($25.6M). 4 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Ken Griffin (0.0% of Citadel Advisors'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 Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 12 | $2.2M |
| Exits | 16 | $18.7M |
All 13F filers, Q1 2025 → Q2 2025: 7,989,674 shares bought and 20,342,979 shares sold, net −12,353,305 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 86 holders
| Janus Henderson Group PLC | 0.02% | Reduce -22.2% | 17,688,592 | $48.1M |
| Rubric Capital Management LP | 0.67% | No change | 15,307,347 | $41.5M |
| Frazier Life Sciences Management, L.P. | 1.02% | Add +20.7% | 9,440,112 | $25.6M |
| Mangrove Partners Im, LLC | 2.56% | No change | 8,636,485 | $23.4M |
| Deerfield Management Company, L.P. | 0.37% | No change | 6,710,429 | $18.2M |
| Alkeon Capital Management LLC | 0.06% | No change | 4,698,100 | $12.7M |
| Rock Springs Capital Management LP | 0.76% | Reduce -33.2% | 4,465,292 | $12.1M |
| 683 Capital Management, LLC | 1.27% | Reduce -6.2% | 4,350,000 | $11.8M |
| Clearline Capital LP | 0.86% | Add +12.4% | 3,618,163 | $9.8M |
| Goldman Sachs Group Inc. | 0.00% | Add +45.4% | 3,090,068 | $8.4M |
| Aberdeen Group plc | 0.01% | Add +38.4% | 3,028,872 | $8.2M |
| Tejara Capital Ltd | 3.05% | Reduce -3.6% | 2,430,437 | $6.6M |
| Renaissance Technologies | 0.01% | Add +9.6% | 1,480,471 | $4.0M |
| FMR LLC | 0.00% | Add +94.8% | 1,478,500 | $4.0M |
| Schonfeld Strategic Advisors LLC | 0.02% | Reduce -42.8% | 909,640 | $2.5M |
| Morgan Stanley | 0.00% | Reduce -64.0% | 785,377 | $2.1M |
| Marshall Wace, LLP | 0.00% | No change | 767,744 | $2.1M |
| Atle Fund Management AB | 0.89% | Add +96.1% | 764,901 | $2.1M |
| Citadel Advisors | 0.00% | Add +121.3% | 760,659 | $2.1M |
| Two Sigma Investments, LP | 0.00% | Add +168.8% | 659,158 | $1.8M |
| Soleus Capital Management, L.P. | 0.11% | Reduce -12.7% | 599,711 | $1.6M |
| Millennium Management | 0.00% | Add +51.0% | 595,673 | $1.6M |
| Artia Global Partners LP | 0.33% | Add +12.8% | 475,361 | $1.3M |
| BlackRock, Inc. | 0.00% | Add +66.0% | 455,365 | $1.2M |
| Hudson Bay Capital Management LP | 0.01% | No change | 450,000 | $1.2M |
| Bank of America Corp. | 0.00% | Reduce 0.0% | 438,661 | $1.2M |
| Monaco Asset Management SAM | 0.41% | Reduce -5.2% | 395,000 | $1.1M |
| UBS Group AG | 0.00% | Reduce -59.9% | 373,505 | $1.0M |
| Susquehanna International Group, LLP | 0.00% | Add +107.3% | 361,542 | $980K |
| Cantor Fitzgerald, L. P. | 0.02% | Reduce -3.4% | 342,957 | $929K |
| Knott David M Jr | 0.39% | No change | 319,337 | $865K |
| Paloma Partners Management Co | 0.35% | New | 296,659 | $804K |
| Knoll Capital Management, LLC | 0.50% | No change | 260,470 | $706K |
| Jane Street Group, LLC | 0.00% | Add +70.9% | 247,441 | $671K |
| Simplex Trading, LLC | 0.01% | Add +4785.6% | 201,141 | $545K |
| Caption Management, LLC | 0.05% | Add +88.6% | 197,599 | $535K |
| Two Sigma Advisers, LP | 0.00% | Add +393.5% | 144,600 | $392K |
| Group One Trading LLC | 0.01% | Add +307.1% | 139,559 | $378K |
| Dauntless Investment Group, LLC | 1.71% | New | 134,122 | $363K |
| Nomura Holdings Inc. | 0.00% | New | 125,000 | $339K |
| Tema ETFs LLC | 0.07% | Reduce -84.3% | 102,583 | $278K |
| NEOS Investment Management LLC | 0.00% | Reduce -84.3% | 102,583 | $278K |
| Leonteq Securities AG | 0.02% | New | 100,000 | $271K |
| Geode Capital Management, LLC | 0.00% | Add +0.4% | 92,534 | $251K |
| XTX Topco Ltd | 0.01% | New | 69,341 | $188K |
| Point72 Asset Management | 0.00% | Add +65.3% | 59,200 | $160K |
| J. Goldman & Co LP | 0.00% | Reduce -34.0% | 52,384 | $142K |
| State Street Corp. | 0.00% | Reduce -1.6% | 44,942 | $122K |
| Clear Harbor Asset Management, LLC | 0.01% | No change | 42,000 | $114K |
| Avanza Fonder AB | 0.00% | Add +36.0% | 38,235 | $104K |
| PFG Investments, LLC | 0.01% | No change | 37,433 | $101K |
| Three Magnolias Financial Advisors, LLC | 0.07% | New | 37,000 | $100K |
| Virtus Investment Advisers, LLC | 0.03% | Reduce -23.1% | 33,825 | $92K |
| Aquatic Capital Management LLC | 0.00% | New | 26,930 | $73K |
| Quadrature Capital Ltd | 0.00% | Add +11.9% | 25,399 | $69K |
| Centiva Capital, LP | 0.00% | No change | 25,000 | $68K |
| Significant Wealth Partners LLC | 0.03% | Add +61.6% | 22,261 | $60K |
| Graham Capital Management, L.P. | 0.00% | Reduce -57.1% | 21,176 | $57K |
| Cubist Systematic Strategies, LLC | 0.00% | New | 21,099 | $57K |
| Squarepoint Ops LLC | 0.00% | Add +15.3% | 20,668 | $56K |
| Ascentis Independent Advisors | 0.01% | No change | 19,900 | $54K |
| Forefront Analytics, LLC | 0.06% | Reduce -59.8% | 19,138 | $52K |
| OneDigital Investment Advisors LLC | 0.00% | No change | 18,300 | $50K |
| Sheets Smith Investment Management | 0.04% | No change | 16,890 | $46K |
| NFSG Corp | 0.01% | Add +18.2% | 13,000 | $35K |
| Level Four Advisory Services, LLC | 0.00% | No change | 10,000 | $27K |
| Marex Group Ltd | 0.00% | No change | 10,000 | $27K |
| Rhumbline Advisers | 0.00% | Add +49.9% | 9,878 | $27K |
| GAMMA Investing LLC | 0.00% | Add +10.5% | 9,257 | $25K |
| Osaic Holdings, Inc. | 0.00% | Add +75.5% | 5,377 | $15K |
| Caitong International Asset Management Co., Ltd | 0.01% | Add +206.2% | 4,544 | $12K |
| Arax Advisory Partners | 0.00% | No change | 4,000 | $11K |
| Allworth Financial LP | 0.00% | Add +9.1% | 1,637 | $4K |
| Raymond James Financial Inc. | 0.00% | New | 1,570 | $4K |
| GPS Wealth Strategies Group, LLC | 0.00% | No change | 1,500 | $4K |
| Sit Investment Associates Inc. | 0.00% | No change | 970 | $3K |
| Brooklyn Investment Group | 0.00% | New | 849 | $2K |
| EverSource Wealth Advisors, LLC | 0.00% | New | 470 | $1K |
| MAI Capital Management | 0.00% | No change | 309 | $838 |
| New England Capital Financial Advisors LLC | 0.00% | No change | 300 | $813 |
| Wells Fargo & Company | 0.00% | Reduce -81.3% | 230 | $622 |
| Signaturefd, LLC | 0.00% | New | 187 | $507 |
| Transce3nd, LLC | 0.00% | No change | 127 | $344 |
| Principal Securities, Inc. | 0.00% | Add +134.4% | 75 | $203 |
| US Bancorp \de | 0.00% | No change | 13 | $35 |
| BNP Paribas Financial Markets | 0.00% | No change | 3 | $8 |
"% 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.