MREO · Insider trading · 13F holders · Congress trades
Mereo Biopharma Group PLC (MREO)
Who is buying and selling MREO: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 4
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
MREO at a glance
- No open-market insider purchases or sales of MREO were filed in the last 90 days.
- 4 13F filers hold MREO among their 50 largest positions, worth $3.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Defilade Capital Management, L.P. (0.3%), Ishara Investments LP (0.2%) and Newtyn Management, LLC (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
- No member of Congress has disclosed a trade in MREO.
MREO insider trading
No open-market insider purchases or sales of MREO were filed in the last 90 days.
Who owns MREO? Hedge funds and superinvestors
4 13F filers hold MREO among their 50 largest positions, worth $3.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Defilade Capital Management, L.P. (0.3%), Ishara Investments LP (0.2%) and Newtyn Management, LLC (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
Superinvestors holding MREO: Oleg Nodelman 0.0%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Defilade Capital Management, L.P.Hedge fund | 0.3% | $2.4M | 7,558,756 | +0.0% shares | Q2 2026 |
| Newtyn Management, LLCHedge fund | 0.1% | $953K | 3,000,000 | -57.6% shares | Q2 2026 |
| Oleg NodelmanHedge fund | 0.0% | $318K | 1,000,000 | -92.5% shares | Q2 2026 |
| Ishara Investments LPHedge fund | 0.2% | $244K | 768,750 | New | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 4). Screen MREO in the grand portfolio →
MREO stock trades by members of Congress
No member of Congress has disclosed a trade in MREO.
MREO questions and answers
Are insiders buying MREO stock?
No open-market insider purchases or sales of MREO were filed in the last 90 days.
Which hedge funds own MREO?
4 13F filers hold MREO among their 50 largest positions, worth $3.9M combined, including Oleg Nodelman. The biggest bets by portfolio weight are Defilade Capital Management, L.P. (0.3%), Ishara Investments LP (0.2%) and Newtyn Management, LLC (0.1%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
Has Congress traded MREO?
No member of Congress has disclosed a trade in MREO.
Who is the largest holder of MREO?
Among 13F filers, Defilade Capital Management, L.P. reports the largest MREO position, $2.4M (7,558,756 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Defilade Capital Management, L.P.'s: 0.3% of its portfolio.
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