Mereo BioPharma Group plc
MREO- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001719714
No open-market purchases or sales by Mereo BioPharma Group plc insiders were filed in the last 90 days; 60 institutions reported holding it in 13F filings for Q2 2026, worth $18.0M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Mereo BioPharma Group plc as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 60
- −3 vs. Q1 2026
- Shares held
- 56.6M
- −18.8M (−24.9%) vs. Q1 2026
- Total value
- $18.0M
- −$6.89M (−27.7%) vs. Q1 2026
- New holders
- 14
- 13 more added
- Sold out
- 17
- 12 more reduced
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MREO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 60 | $18.0M |
| Q1 2026 | 63 | $24.9M |
| Q4 2025 | 70 | $25.8M |
| Q3 2025 | 84 | $205.2M |
| Q2 2025 | 86 | $267.8M |
| Q1 2025 | 90 | $250.3M |
| Q4 2024 | 91 | $403.1M |
| Q3 2024 | 77 | $434.8M |
| Q2 2024 | 79 | $362.2M |
| Q1 2024 | 80 | $286.6M |
| Q4 2023 | 64 | $181.6M |
| Q3 2023 | 56 | $90.4M |
| Q2 2023 | 53 | $84.3M |
| Q1 2023 | 58 | $43.2M |
| Q4 2022 | 61 | $46.2M |
| Q3 2022 | 63 | $58.5M |
| Q2 2022 | 64 | $82.7M |
| Q1 2022 | 60 | $99.9M |
| Q4 2021 | 73 | $146.4M |
| Q3 2021 | 63 | $212.2M |
| Q2 2021 | 72 | $289.8M |
| Q1 2021 | 67 | $304.5M |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Mereo BioPharma Group plc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Rubric Capital Management LP | 15,307,347 | $4.86M | 0.04% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 11,777,856 | $3.74M | 0.34% | −222,144−1.9% | Reduced |
| Bank of America Corp | 8,195,281 | $2.60M | 0.00% | −60.0% | Reduced |
| Defilade Capital Management, L.P. | 7,558,756 | $2.40M | 0.32% | 00.0% | Unchanged |
| Newtyn Management, LLC | 3,000,000 | $953.1K | 0.12% | −4,079,056−57.6% | Reduced |
| Tejara Capital Ltd | 2,037,520 | $647.3K | 0.27% | 00.0% | Unchanged |
| UBS Group AG | 1,447,627 | $460.3K | 0.00% | −42,501−2.9% | Reduced |
| Two Sigma Investments, LP | 1,319,241 | $419.1K | 0.00% | +1,131,402+602.3% | Added |
| EcoR1 Capital, LLC | 1,000,000 | $317.7K | 0.02% | −12,368,855−92.5% | Reduced |
| Jane Street Group, LLC | 774,944 | $246.2K | 0.00% | +634,971+453.6% | Added |
| Ishara Investments LP | 768,750 | $244.2K | 0.18% | +768,750 | New |
| Wealthspire Advisors, LLC | 765,000 | $243.0K | 0.00% | −31,036−3.9% | Reduced |
| Citadel Advisors LLC | 444,158 | $141.1K | 0.00% | +444,158 | New |
| Rangeley Capital, LLC | 329,200 | $104.6K | 0.10% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 213,270 | $67.8K | 0.00% | +17,350+8.9% | Added |
| Marshall Wace, LLP | 179,884 | $57.6K | 0.00% | −507,103−73.8% | Reduced |
| XTX Topco Ltd | 174,481 | $55.4K | 0.00% | +90,012+106.6% | Added |
| Group One Trading, L.P. | 167,515 | $53.2K | 0.00% | −168,312−50.1% | Reduced |
| State Street Corp | 134,772 | $42.8K | 0.00% | +1,393+1.0% | Added |
| Nomura Holdings Inc | 104,361 | $33.2K | 0.00% | +104,361 | New |
| James J. Burns & Company, LLC | 95,400 | $30.3K | 0.00% | +95,400 | New |
| Quarry LP | 93,750 | $29.8K | 0.00% | +93,750 | New |
| Goldman Sachs Group Inc | 85,180 | $27.1K | 0.00% | +85,180 | New |
| JMN Financial LLC | 76,748 | $24.4K | 0.02% | +76,748 | New |
| BlackRock, Inc. | 69,678 | $22.1K | 0.00% | −233,313−77.0% | Reduced |
| JPMorgan Chase & Co | 58,531 | $19.4K | 0.00% | +36,683+167.9% | Added |
| Virtu Financial LLC | 61,285 | $19.0K | 0.00% | +24,827+68.1% | Added |
| Renaissance Technologies LLC | 52,100 | $16.6K | 0.00% | +3,700+7.6% | Added |
| Significant Wealth Partners LLC | 32,677 | $10.4K | 0.01% | +7,043+27.5% | Added |
| Clear Harbor Asset Management, LLC | 32,000 | $10.1K | 0.00% | −3,000−8.6% | Reduced |
| Rhumbline Advisers | 26,784 | $8.51K | 0.00% | +7,212+36.8% | Added |
| Centiva Capital, LP | 25,000 | $7.94K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 23,953 | $7.61K | 0.00% | −10.0% | Reduced |
| Simplex Trading, LLC | 18,780 | $5.97K | 0.00% | +18,780 | New |
| Newbridge Financial Services Group, Inc. | 18,750 | $5.96K | 0.00% | 00.0% | Unchanged |
| Resources Investment Advisors, LLC. | 18,300 | $5.81K | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 16,731 | $5.32K | 0.00% | +306+1.9% | Added |
| IHT Wealth Management, LLC | 15,000 | $4.77K | 0.00% | 00.0% | Unchanged |
| Two Sigma Securities, LLC | 12,900 | $4.10K | 0.00% | +12,900 | New |
| J. Safra Sarasin Holding AG | 12,841 | $4.08K | 0.00% | +12,841 | New |
| SG Americas Securities, LLC | 12,802 | $4.00K | 0.00% | +12,802 | New |
| MML Investors Services, LLC | 12,200 | $3.88K | 0.00% | 00.0% | Unchanged |
| Pensionmark Financial Group, LLC | 10,000 | $3.30K | 0.00% | 00.0% | Unchanged |
| Astoria Portfolio Advisors LLC. | 10,000 | $3.18K | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 9,308 | $2.96K | 0.00% | −9,966−51.7% | Reduced |
| SRS Capital Advisors, Inc. | 5,819 | $1.85K | 0.00% | +1,819+45.5% | Added |
| Rockefeller Capital Management L.P. | 2,000 | $635 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 1,500 | $479 | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 1,500 | $477 | 0.00% | 00.0% | Unchanged |
| Markowski Investments | 1,500 | $477 | 0.00% | +1,500 | New |
| New England Capital Financial Advisors LLC | 300 | $96 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 231 | $73 | 0.00% | +1+0.4% | Added |
| SBI Securities Co., Ltd. | 114 | $36 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 100 | $32 | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 52 | $17 | 0.00% | +52 | New |
| US Bancorp | 13 | $4 | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 3 | $1 | 0.00% | 00.0% | Unchanged |
| Sit Investment Associates Inc | 970 | $0 | 0.00% | 00.0% | Unchanged |
| Axiom Investment Management LLC | 1 | $0 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 1 | $0 | 0.00% | +1 | New |
| Millennium Management LLC | 0 | $0 | 0.00% | −3,559,103−100.0% | Sold out |
| Knott David M Jr | 0 | $0 | 0.00% | −300,337−100.0% | Sold out |
| Acadian Asset Management LLC | 0 | $0 | 0.00% | −209,084−100.0% | Sold out |
| ADAR1 Capital Management, LLC | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Forefront Analytics, LLC | 0 | $0 | 0.00% | −127,778−100.0% | Sold out |
| Virtus Investment Advisers, Inc. | 0 | $0 | 0.00% | −125,662−100.0% | Sold out |
| Geode Capital Management, LLC | 0 | $0 | 0.00% | −92,534−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −64,064−100.0% | Sold out |
| SmartHarvest Portfolios, LLC | 0 | $0 | 0.00% | −49,512−100.0% | Sold out |
| StoneX Group Inc. | 0 | $0 | 0.00% | −36,873−100.0% | Sold out |
| Independent Advisor Alliance | 0 | $0 | 0.00% | −35,227−100.0% | Sold out |
| Blue Rock Wealth Management LLC | 0 | $0 | 0.00% | −19,000−100.0% | Sold out |
| Baader Bank INC | 0 | $0 | 0.00% | −12,330−100.0% | Sold out |
| Barclays PLC | 0 | $0 | 0.00% | −2,496−100.0% | Sold out |
| MAI Capital Management | 0 | $0 | 0.00% | −309−100.0% | Sold out |
| Sound Income Strategies, LLC | 0 | $0 | 0.00% | −66−100.0% | Sold out |
| National Bank of Canada | 0 | $0 | 0.00% | −46−100.0% | Sold out |