MEREO BIOPHARMA GROUP PLC (MREO)
Institutional ownership reported to the SEC as of Q2 2026, across 29 quarters.
60
Reporting holders
$18.3M
Reported value
7.1%
Of shares outstanding
1.7%
Held as options
-1
Holder change
Institutions report 56,540,904 shares against 798,454,864 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Rubric Capital Management LP | $4.9M | 15,307,347 | 0.04% | 23q | HELD |
| 683 Capital Management, LLC | $3.7M | 11,777,856 | 0.18% | 15q | -1.9%-$70.6K |
| BANK OF AMERICA CORP /DE/ | $2.6M | 8,195,281 | 0.00% | 29q | HELD |
| Defilade Capital Management, L.P. | $2.4M | 7,558,756 | 0.32% | 2q | HELD |
| Newtyn Management, LLC | $953.1K | 3,000,000 | 0.12% | 3q | -57.6%-$1.3M |
| Tejara Capital Ltd | $647.3K | 2,037,520 | 0.27% | 15q | HELD |
| UBS Group AG | $460.3K | 1,447,627 | 0.00% | 7q | -2.9%-$13.5K |
| TWO SIGMA INVESTMENTS, LP | $419.1K | 1,319,241 | 0.00% | 13q | +602.3%+$359.4K |
| CITADEL ADVISORS LLC | $317.7K | 444,158 | 0.00% | 24q | HELD |
| EcoR1 Capital, LLC | $317.7K | 1,000,000 | 0.02% | 3q | -92.5%-$3.9M |
| JANE STREET GROUP, LLC | $249.9K | 774,944 | 0.00% | 10q | +453.6%+$204.8K |
| Ishara Investments LP | $244.2K | 768,750 | 0.18% | new | NEW |
| Wealthspire Advisors, LLC | $243.0K | 765,000 | 0.00% | 2q | -3.9%-$9.9K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $138.0K | 213,270 | 0.00% | 22q | +8.9%+$11.2K |
| Rangeley Capital, LLC | $104.6K | 329,200 | 0.10% | 3q | HELD |
| GROUP ONE TRADING LLC | $73.7K | 167,515 | 0.00% | 6q | -50.1%-$74.0K |
| MARSHALL WACE, LLP | $57.6K | 179,884 | 0.00% | 2q | -73.8%-$162.3K |
| XTX Topco Ltd | $55.4K | 174,481 | 0.00% | 2q | +106.6%+$28.6K |
| SIMPLEX TRADING, LLC | $52.5K | 18,780 | 0.00% | 18q | HELD |
| STATE STREET CORP | $42.8K | 134,772 | 0.00% | 8q | +1.0% |
| NOMURA HOLDINGS INC | $33.2K | 104,361 | 0.00% | new | NEW |
| James J. Burns & Company, LLC | $30.3K | 95,400 | 0.00% | new | NEW |
| Quarry LP | $29.8K | 93,750 | 0.00% | new | NEW |
| GOLDMAN SACHS GROUP INC | $27.1K | 85,180 | 0.00% | new | NEW |
| JMN Financial LLC | $24.4K | 76,748 | 0.02% | new | NEW |
| BlackRock, Inc. | $22.1K | 69,678 | 0.00% | 8q | -77.0%-$74.1K |
| JPMORGAN CHASE & CO | $19.4K | 58,531 | 0.00% | 2q | +167.9%+$12.2K |
| RENAISSANCE TECHNOLOGIES LLC | $16.6K | 52,100 | 0.00% | 25q | +7.6%+$1.2K |
| Significant Wealth Partners LLC | $10.4K | 32,677 | 0.01% | 7q | +27.5%+$2.2K |
| Clear Harbor Asset Management, LLC | $10.1K | 32,000 | 0.00% | 19q | -8.6% |
| RHUMBLINE ADVISERS | $8.5K | 26,784 | 0.00% | 13q | +36.8%+$2.3K |
| Centiva Capital, LP | $7.9K | 25,000 | 0.00% | 17q | HELD |
| Engineers Gate Manager LP | $7.6K | 23,953 | 0.00% | 3q | HELD |
| NFSG Corp | $6.0K | 18,750 | 0.00% | 7q | HELD |
| OneDigital Investment Advisors LLC | $5.8K | 18,300 | 0.00% | 14q | HELD |
| MORGAN STANLEY | $5.3K | 16,731 | 0.00% | 29q | +1.9% |
| IHT Wealth Management, LLC | $4.8K | 15,000 | 0.00% | 2q | HELD |
| TWO SIGMA SECURITIES, LLC | $4.1K | 12,900 | 0.00% | new | NEW |
| J. Safra Sarasin Holding AG | $4.1K | 12,841 | 0.00% | new | NEW |
| MML INVESTORS SERVICES, LLC | $3.9K | 12,200 | 0.00% | 3q | HELD |
| World Investment Advisors | $3.3K | 10,000 | 0.00% | 2q | HELD |
| Astoria Portfolio Advisors LLC. | $3.2K | 10,000 | 0.00% | 3q | HELD |
| GAMMA Investing LLC | $3.0K | 9,308 | 0.00% | 11q | -51.7%-$3.2K |
| Arax Advisory Partners | $1.8K | 5,819 | 0.00% | 20q | +45.5% |
| Rockefeller Capital Management L.P. | $635 | 2,000 | 0.00% | 4q | HELD |
| OSAIC HOLDINGS, INC. | $479 | 1,500 | 0.00% | 7q | HELD |
| Allworth Financial LP | $477 | 1,500 | 0.00% | 15q | HELD |
| Markowski Investments | $477 | 1,500 | 0.00% | new | FIRST |
| New England Capital Financial Advisors LLC | $96 | 300 | 0.00% | 15q | HELD |
| WELLS FARGO & COMPANY/MN | $73 | 231 | 0.00% | 15q | -49.8% |
| MERCER GLOBAL ADVISORS INC /ADV | $71 | 225 | 0.00% | new | NEW |
| SBI Securities Co., Ltd. | $36 | 114 | 0.00% | 2q | HELD |
| EverSource Wealth Advisors, LLC | $32 | 100 | 0.00% | 5q | HELD |
| Virtu Financial LLC | $19 | 61,285 | 0.00% | 2q | +68.1% |
| CITIGROUP INC | $17 | 52 | 0.00% | new | NEW |
| US BANCORP \DE\ | $4 | 13 | 0.00% | 15q | HELD |
| SG Americas Securities, LLC | $4 | 12,802 | 0.00% | new | NEW |
| BNP PARIBAS FINANCIAL MARKETS | $1 | 3 | 0.00% | 17q | HELD |
| SIT INVESTMENT ASSOCIATES INC | $0 | 970 | 0.00% | new | NEW |
| Axiom Investment Management LLC | $0 | 1 | 0.00% | new | NEW |
| Integrated Wealth Concepts LLC | $0 | 1 | 0.00% | new | NEW |
| Caitong International Asset Management Co., Ltd | $0 | 1 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | EcoR1 Capital, LLCwith 2 co-filers | 0.6% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 60 | $18.3M | 56,540,904 | 15 | 11 | 11 | 1.7% |
| Q1 2026 | 61 | $25.3M | 75,134,254 | 12 | 14 | 16 | 2.1% |
| Q4 2025 | 73 | $28.4M | 61,968,423 | 20 | 15 | 21 | 9.1% |
| Q3 2025 | 82 | $210.1M | 99,674,029 | 11 | 23 | 21 | 2.9% |
| Q2 2025 | 90 | $278.3M | 98,559,656 | 15 | 29 | 20 | 4.0% |
| Q1 2025 | 88 | $255.3M | 111,079,672 | 14 | 25 | 20 | 2.0% |
| Q4 2024 | 91 | $407.6M | 115,147,900 | 17 | 18 | 25 | 1.1% |
| Q3 2024 | 75 | $438.1M | 105,325,969 | 9 | 19 | 20 | 1.2% |
| Q2 2024 | 75 | $365.0M | 100,228,244 | 13 | 19 | 27 | 1.1% |
| Q1 2024 | 74 | $280.6M | 84,013,039 | 22 | 24 | 10 | 1.2% |
| Q4 2023 | 62 | $179.4M | 76,756,923 | 16 | 17 | 12 | 1.2% |
| Q3 2023 | 54 | $88.7M | 68,764,700 | 6 | 12 | 14 | 0.7% |
| Q2 2023 | 51 | $79.3M | 60,161,091 | 7 | 8 | 21 | 0.9% |
| Q1 2023 | 50 | $38.4M | 54,227,840 | 4 | 12 | 10 | 0.1% |
| Q4 2022 | 47 | $42.5M | 56,492,095 | 6 | 8 | 10 | 0.4% |
| Q3 2022 | 57 | $58.9M | 67,996,412 | 8 | 18 | 15 | 0.6% |
| Q2 2022 | 59 | $83.2M | 74,240,950 | 18 | 11 | 18 | 0.7% |
| Q1 2022 | 56 | $100.0M | 89,823,469 | 3 | 20 | 12 | 0.1% |
| Q4 2021 | 69 | $146.5M | 92,146,196 | 17 | 18 | 15 | 0.1% |
| Q3 2021 | 60 | $212.8M | 88,448,865 | 9 | 15 | 18 | 0.3% |
| Q2 2021 | 69 | $290.8M | 92,283,987 | 13 | 23 | 15 | 0.3% |
| Q1 2021 | 68 | $306.5M | 91,375,416 | 35 | 17 | 7 | 0.6% |
| Q4 2020 | 46 | $210.6M | 59,854,102 | 23 | 7 | 6 | 0.0% |
| Q3 2020 | 23 | $38.1M | 15,471,837 | 8 | 5 | 3 | 0.0% |
| Q2 2020 | 21 | $22.3M | 7,275,581 | 14 | 3 | 3 | 0.0% |
| Q1 2020 | 9 | $3.4M | 3,280,230 | 3 | 1 | 4 | 0.0% |
| Q4 2019 | 11 | $4.1M | 1,244,380 | 0 | 1 | 5 | 0.0% |
| Q3 2019 | 14 | $5.2M | 1,782,347 | 1 | 5 | 3 | 0.0% |
| Q2 2019 | 16 | $4.4M | 1,800,315 | 16 | 0 | 0 | 0.0% |