Who owns Mereo BioPharma Group plc?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from SEC filings.
Institutional ownership of MREO from SEC Form 13F filings across 42 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 42 institutions disclosed 26.5M shares of Mereo BioPharma Group plc worth $8.4M — about 3.3% of shares outstanding; the largest disclosed holder is 683 Capital Management, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
42
13F holders
$8.4M
value, 2026 filers
3.3%
of shares outstanding (26.5M sh)
11
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of MREO's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | 683 Capital Management, LLC | 11.8M | $3.7M | 0.2% | 1.5% | -1.9% |
| 2 | BANK OF AMERICA CORP /DE/ | 8.2M | $2.6M | 0.0% | 1% | 0.0% |
| 3 | UBS Group AG | 1.4M | $460,346 | 0.0% | 0.2% | -2.9% |
| 4 | TWO SIGMA INVESTMENTS, LP | 1.3M | $419,123 | 0.0% | 0.2% | +602.3% |
| 5 | JANE STREET GROUP, LLC | 774,944 | $246,200 | 0.0% | 0.1% | +453.6% |
| 6 | Ishara Investments LPNEW | 768,750 | $244,232 | 0.2% | 0.1% | new |
| 7 | Wealthspire Advisors, LLC | 765,000 | $243,041 | 0.0% | 0.1% | -3.9% |
| 8 | CITADEL ADVISORS LLCNEW | 444,158 | $141,109 | 0.0% | 0.1% | new |
| 9 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 213,270 | $67,756 | 0.0% | 0% | +8.9% |
| 10 | MARSHALL WACE, LLP | 179,884 | $57,563 | 0.0% | 0% | -73.8% |
| 11 | NOMURA HOLDINGS INCNEW | 104,361 | $33,155 | 0.0% | 0% | new |
| 12 | Quarry LPNEW | 93,750 | $29,784 | 0.0% | 0% | new |
| 13 | GOLDMAN SACHS GROUP INCNEW | 85,180 | $27,062 | 0.0% | 0% | new |
| 14 | BlackRock, Inc. | 69,678 | $22,137 | 0.0% | 0% | -77.0% |
| 15 | JPMORGAN CHASE & CO | 58,531 | $19,421 | 0.0% | 0% | +167.9% |
| 16 | RHUMBLINE ADVISERS | 26,784 | $8,511 | 0.0% | 0% | +36.8% |
| 17 | Centiva Capital, LP | 25,000 | $7,943 | 0.0% | 0% | 0.0% |
| 18 | Engineers Gate Manager LP | 23,953 | $7,610 | 0.0% | 0% | 0.0% |
| 19 | NFSG Corp | 18,750 | $5,957 | 0.0% | 0% | 0.0% |
| 20 | OneDigital Investment Advisors LLC | 18,300 | $5,814 | 0.0% | 0% | 0.0% |
| 21 | MORGAN STANLEY | 16,731 | $5,317 | 0.0% | 0% | +1.9% |
| 22 | IHT Wealth Management, LLC | 15,000 | $4,766 | 0.0% | 0% | 0.0% |
| 23 | TWO SIGMA SECURITIES, LLCNEW | 12,900 | $4,098 | 0.0% | 0% | new |
| 24 | J. Safra Sarasin Holding AGNEW | 12,841 | $4,081 | 0.0% | 0% | new |
| 25 | SG Americas Securities, LLCNEW | 12,802 | $4 | 0.0% | 0% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.