🕵️ Boundless BIO, Inc. ($BOLD)
SEC insider & ownership activity, last 12 months · CIK 1782303 · every row links its SEC filing
Over the last 12 months insiders sold $80K against $1.5M of open-market buying. Tang Kevin bought $1.5M (Jun–Jul). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $1.5M (22 lots) · 2 sellers, $80K (2 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Tang Kevin | 22 | $1.5M | 0 | – | Jul 21, 2026 |
| Crandell Keith | 0 | – | 1 | $40K | Jul 1, 2026 |
| ARCH Venture Fund IX, L.P. | 0 | – | 1 | $40K | Jul 1, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| FMR LLC | 12.0% | 13G | Feb 5, 2026 | filing ↗ | |
| Abigail P. Johnson | 12.0% | 13G | Feb 5, 2026 | filing ↗ | |
| TANG Capital Management, LLC | 11.3% | 13G | Jun 29, 2026 | filing ↗ | |
| Kevin Tang | 11.3% | 13G | Jun 29, 2026 | filing ↗ | |
| Kenneth Griffin | 6.4% | 13G | Dec 4, 2025 | filing ↗ | |
| TANG Capital Partners International, LP | exited | 13G | Jun 29, 2026 | filing ↗ | |
| TANG Capital Partners, LP | exited | 13G | Jun 29, 2026 | filing ↗ | |
| TANG Capital Partners III, Inc | exited | 13G | Jun 29, 2026 | filing ↗ | |
| TANG Capital Partners IV, Inc | exited | 13G | Jun 29, 2026 | 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) | Jun 22, 2026 | filing ↗ |
| Exit or disposal costs (2.05) | Jun 22, 2026 | filing ↗ |
| Unregistered equity sale (3.02) | Jun 22, 2026 | filing ↗ |
| Change of control (5.01) | Jun 22, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 22, 2026 | filing ↗ |
| Other events (8.01) | Jun 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 22, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 15, 2026 | filing ↗ |
| Earnings (2.02) | May 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 8, 2026 | filing ↗ |
| Agreement terminated (1.02) | Apr 13, 2026 | filing ↗ |
| New financial obligation (2.03) | Apr 13, 2026 | filing ↗ |
| Earnings (2.02) | Mar 3, 2026 | filing ↗ |
| Officer/director changes (5.02) | Mar 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 3, 2026 | filing ↗ |
| Earnings (2.02) | Nov 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 5, 2025 | filing ↗ |
| Earnings (2.02) | Aug 5, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 5, 2025 | filing ↗ |