BOLD: Boundless Bio, Inc. insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
4 open-market buys totaling $350K and 0 sales totaling - in the last 180 days.
Insider buys
| Score | Ticker | Company | Insider | Role | Trade date | Value | Holding + | Cluster |
|---|---|---|---|---|---|---|---|---|
| 8 | BOLD | Boundless Bio, Inc. | Tang Kevin / Tang Capital Management Llc | 10% Owner | 2026-10-20 | $521 | 0% | |
| 24 | BOLD | Boundless Bio, Inc. | Tang Kevin / Tang Capital Management Llc | 10% Owner | 2026-10-19 | $30K | 0% | |
| 25 | BOLD | Boundless Bio, Inc. | Tang Kevin / Tang Capital Management Llc | 10% Owner | 2026-10-19 | $43K | 1% | |
| 31 | BOLD | Boundless Bio, Inc. | Tang Kevin / Tang Capital Management Llc | 10% Owner | 2026-10-16 | $277K | 4% |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-27 | New 13G stake | Zachary Hornby | 9.80% | SEC |
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