🕵️ GT Biopharma, Inc. ($GTBP)
SEC insider & ownership activity, last 12 months · CIK 109657 · every row links its SEC filing
Insiders were quiet over the last 12 months – no open-market buys or sells. 3 red-flag 8-Ks in the window, most recently Delisting notice (3.01), May 20, 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 | |
|---|---|---|---|---|---|
| RainForest Partners, LLC | 10.0% | 13G | Sep 15, 2026 | filing ↗ | |
| FIVE Narrow LANE LP | 10.0% | 13G | May 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) | Sep 14, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | Sep 14, 2026 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Sep 14, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Sep 14, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 14, 2026 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Sep 2, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Sep 2, 2026 | filing ↗ |
| Other events (8.01) | Sep 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 2, 2026 | filing ↗ |
| Shareholder vote (5.07) | Aug 14, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 14, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Jun 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 8, 2026 | filing ↗ |
| Delisting notice (3.01) | May 20, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 20, 2026 | filing ↗ |
| Material agreement (1.01) | Apr 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 3, 2026 | filing ↗ |
| Restatement (4.02) | Mar 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 1, 2026 | filing ↗ |
| Delisting notice (3.01) | Nov 20, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 20, 2025 | filing ↗ |
| Earnings (2.02) | Nov 14, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 14, 2025 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Sep 25, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 25, 2025 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Sep 17, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Sep 17, 2025 | filing ↗ |