🕵️ Mereo Biopharma Group PLC ($MREO)
SEC insider & ownership activity, last 12 months · CIK 1719714 · every row links its SEC filing
Insiders were quiet over the last 12 months – no open-market buys or sells. One red-flag 8-K in the window: Delisting notice (3.01), Feb 17, 2026.
Insider flow
0 buyers, $0 (0 lots) · 0 sellers, $0 (0 lots)
No open-market insider transactions in the last 12 months.
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Janus Henderson Biotech Innovation Master Fund Ltd | 8.7% | 13G | Nov 14, 2025 | filing ↗ | |
| ECOR1 Capital, LLC | 8.4% | 13G | May 15, 2026 | filing ↗ | |
| Oleg Nodelman | 8.4% | 13G | May 15, 2026 | filing ↗ | |
| 683 Capital Management, LLC | 8.2% | 13G | Jan 6, 2026 | filing ↗ | |
| 683 Capital Partners, LP | 8.2% | 13G | Jan 6, 2026 | filing ↗ | |
| Ari Zweiman | 8.2% | 13G | Jan 6, 2026 | filing ↗ | |
| ECOR1 Capital Fund Qualified, L.P. | 7.8% | 13G | May 15, 2026 | filing ↗ | |
| Bank of America Corp /DE/ | 5.1% | 13G | May 14, 2026 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | May 14, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 14, 2026 | filing ↗ |
| Earnings (2.02) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | May 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 12, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 26, 2026 | filing ↗ |
| Earnings (2.02) | Mar 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 19, 2026 | filing ↗ |
| Delisting notice (3.01) | Feb 17, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 12, 2026 | filing ↗ |
| Other events (8.01) | Jan 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 29, 2025 | filing ↗ |
| Other events (8.01) | Dec 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 29, 2025 | filing ↗ |
| Earnings (2.02) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |
| Earnings (2.02) | Aug 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2025 | filing ↗ |