🕵️ Generation BIO Co. ($GBIO)
SEC insider & ownership activity, last 12 months · CIK 1733294 · 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 6, 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 | |
|---|---|---|---|---|---|
| Symbiosis Capital Partners, LLC | 6.3% | 13G | Nov 14, 2025 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Feb 6, 2026 | filing ↗ |
| Agreement terminated (1.02) | Feb 6, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Feb 6, 2026 | filing ↗ |
| Delisting notice (3.01) | Feb 6, 2026 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Feb 6, 2026 | filing ↗ |
| Change of control (5.01) | Feb 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 6, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Feb 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 6, 2026 | filing ↗ |
| Material agreement (1.01) | Dec 15, 2025 | filing ↗ |
| Other events (8.01) | Dec 15, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 15, 2025 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Officer/director changes (5.02) | Oct 21, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 21, 2025 | filing ↗ |
| Earnings (2.02) | Aug 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2025 | filing ↗ |