Mereo Biopharma Grp ADRF Unsponsored 1 Reps 4 Ord (MREO)
Institutional ownership reported to the SEC as of Q2 2026, across 30 quarters.
Institutions report 56,614,765 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.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
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 incl. $176.6K options CALL+PUT | 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 incl. $3.7K options CALL | 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 incl. $70.2K options CALL+PUT | 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 incl. $20.5K options CALL+PUT | 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 incl. $46.5K options CALL+PUT | 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 |
| Virtu Financial LLC | $19.0K | 61,285 | 0.00% | 2q | +68.1%+$7.7K |
| 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 |
| SG Americas Securities, LLC | $4.0K | 12,802 | 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 | HELD |
| SBI Securities Co., Ltd. | $36 | 114 | 0.00% | 2q | HELD |
| EverSource Wealth Advisors, LLC | $32 | 100 | 0.00% | 5q | HELD |
| CITIGROUP INC | $17 | 52 | 0.00% | new | NEW |
| US BANCORP \DE\ | $4 | 13 | 0.00% | 15q | HELD |
| 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% | 2q | HELD |
| Caitong International Asset Management Co., Ltd | $0 | 1 | 0.00% | new | NEW |
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-08-19 | 2026-08-18 | Delisting notice | filing |
| 2026-08-11 | 2026-08-11 | Material agreement entered | filing |
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 |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 3 | $46.7K | 116,141 | 0 | 0 | 1 | 0.0% |
| Q2 2026 | 60 | $18.3M | 56,614,765 | 13 | 12 | 10 | 1.7% |
| Q1 2026 | 64 | $25.4M | 75,379,567 | 14 | 15 | 16 | 2.1% |
| Q4 2025 | 74 | $28.4M | 62,029,858 | 20 | 15 | 22 | 9.1% |
| Q3 2025 | 87 | $211.3M | 100,236,613 | 15 | 23 | 22 | 2.9% |
| Q2 2025 | 91 | $279.4M | 98,761,767 | 15 | 30 | 20 | 4.2% |
| Q1 2025 | 90 | $255.5M | 111,100,472 | 15 | 25 | 21 | 2.1% |
| Q4 2024 | 92 | $408.0M | 115,203,969 | 17 | 19 | 25 | 1.2% |
| Q3 2024 | 78 | $440.2M | 105,758,863 | 10 | 20 | 21 | 1.2% |
| Q2 2024 | 78 | $366.5M | 100,520,759 | 14 | 21 | 27 | 1.2% |
| Q1 2024 | 80 | $290.2M | 86,829,539 | 27 | 24 | 11 | 1.3% |
| Q4 2023 | 66 | $184.0M | 78,639,067 | 17 | 18 | 13 | 1.3% |
| Q3 2023 | 57 | $91.1M | 70,527,333 | 7 | 12 | 15 | 0.8% |
| Q2 2023 | 55 | $85.1M | 64,522,747 | 7 | 9 | 22 | 0.9% |
| Q1 2023 | 58 | $43.3M | 61,145,990 | 5 | 15 | 11 | 0.1% |
| Q4 2022 | 59 | $46.3M | 61,576,684 | 7 | 14 | 12 | 0.4% |
| Q3 2022 | 56 | $58.9M | 67,995,875 | 8 | 18 | 14 | 0.6% |
| Q2 2022 | 58 | $83.2M | 74,237,521 | 17 | 11 | 18 | 0.7% |
| Q1 2022 | 56 | $514.1M | 459,623,299 | 3 | 20 | 12 | 0.0% |
| Q4 2021 | 69 | $561.3M | 351,356,726 | 17 | 18 | 15 | 0.0% |
| Q3 2021 | 60 | $2.4B | 987,118,296 | 9 | 15 | 18 | 0.0% |
| Q2 2021 | 69 | $290.8M | 92,283,987 | 13 | 23 | 15 | 0.3% |
| Q1 2021 | 67 | $306.5M | 91,371,416 | 34 | 17 | 7 | 0.6% |
| Q4 2020 | 46 | $211.2M | 60,037,918 | 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% |