MEREO BIOPHARMA GROUP PL-ADR (MREO) Institutional Ownership Changes & 13F Activity
MEREO BIOPHARMA GROUP PL-ADR (MREO). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Ecor1 Capital, Llc, Newtyn Management, Llc, Two Sigma Investments, Lp, Ishara Investments Lp, and Jane Street Group, Llc.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Citadel Advisors Llc | Buy | +444,158 | — | 444,158 | $141.11K | Q2 2026 | Sep 02, 2026 |
| Ecor1 Capital, Llc | Sell | -12,368,855 | -92.5% | 1,000,000 | $317.70K | Q2 2026 | Aug 14, 2026 |
| Newtyn Management, Llc | Sell | -4,079,056 | -57.6% | 3,000,000 | $953.10K | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +1,131,402 | +602.3% | 1,319,241 | $419.12K | Q2 2026 | Aug 14, 2026 |
| Ishara Investments Lp | Buy | +768,750 | — | 768,750 | $244.23K | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +634,971 | +453.6% | 774,944 | $246.20K | Q2 2026 | Aug 14, 2026 |
| 683 Capital Management, Llc | Sell | -222,144 | -1.9% | 11,777,856 | $3.74M | Q2 2026 | Aug 14, 2026 |
| Group One Trading Llc | Sell | -168,312 | -50.1% | 167,515 | $53.22K | Q2 2026 | Aug 14, 2026 |
| Nomura Holdings Inc | Buy | +104,361 | — | 104,361 | $33.16K | Q2 2026 | Aug 14, 2026 |
| Quarry Lp | Buy | +93,750 | — | 93,750 | $29.78K | Q2 2026 | Aug 14, 2026 |
| Xtx Topco Ltd | Buy | +90,012 | +106.6% | 174,481 | $55.43K | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Buy | +85,180 | — | 85,180 | $27.06K | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Buy | +17,350 | +8.9% | 213,270 | $67.76K | Q2 2026 | Aug 14, 2026 |
| Two Sigma Securities, Llc | Buy | +12,900 | — | 12,900 | $4.10K | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Sell | -6 | -0.0% | 8,195,281 | $2.60M | Q2 2026 | Aug 14, 2026 |
| Engineers Gate Manager Lp | Sell | -1 | -0.0% | 23,953 | $7.61K | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +1 | +0.4% | 231 | $73.00 | Q2 2026 | Aug 14, 2026 |
| Marshall Wace, Llp | Sell | -507,103 | -73.8% | 179,884 | $57.56K | Q2 2026 | Aug 13, 2026 |
| Ubs Group Ag | Sell | -42,501 | -2.9% | 1,447,627 | $460.35K | Q2 2026 | Aug 13, 2026 |
| Virtu Financial Llc | Buy | +24,827 | +68.1% | 61,285 | $19.00K | Q2 2026 | Aug 13, 2026 |
| Renaissance Technologies LLC | Buy | +3,700 | +7.6% | 52,100 | $16.55K | Q2 2026 | Aug 13, 2026 |
| Morgan Stanley | Buy | +306 | +1.9% | 16,731 | $5.32K | Q2 2026 | Aug 13, 2026 |
| Jpmorgan Chase & Co | Buy | +58,531 | — | 58,531 | $19.42K | Q2 2026 | Aug 12, 2026 |
| Simplex Trading, Llc | Buy | +18,780 | — | 18,780 | $5.97K | Q2 2026 | Aug 12, 2026 |
| Rhumbline Advisers | Buy | +7,212 | +36.8% | 26,784 | $8.51K | Q2 2026 | Aug 12, 2026 |
| Clear Harbor Asset Management, Llc | Sell | -3,000 | -8.6% | 32,000 | $10.08K | Q2 2026 | Aug 12, 2026 |
| Wealthspire Advisors, Llc | Sell | -31,036 | -3.9% | 765,000 | $243.04K | Q2 2026 | Aug 11, 2026 |
| Jmn Financial Llc | Buy | +76,748 | — | 76,748 | $24.38K | Q2 2026 | Aug 10, 2026 |
| Arax Advisory Partners | Buy | +1,819 | +45.5% | 5,819 | $1.85K | Q2 2026 | Aug 10, 2026 |
| Blackrock, Inc. | Sell | -233,313 | -77.0% | 69,678 | $22.14K | Q2 2026 | Aug 07, 2026 |
Frequently asked questions about MREO activity
Which institutional owners are buying MREO?
Institutional owners buying MREO include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in MREO activity?
"Buy" means an investor increased their reported position in MREO compared to the prior reporting period. This reflects growing exposure to MEREO BIOPHARMA GROUP PL-ADR (MREO) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in MREO increasing?
Institutional interest in MREO can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related MREO Institutional Insights
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- MREO Top Institutional Shareholders
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- Healthcare Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
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- MREO Insider Trading & SEC Form 4 Activity
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