Form4.ai tracks every SEC insider trade in real time. See every BOLD insider filing with a free account — no card.
See every BOLD insider filing — free account, no card.
Free accountBoundless Bio, Inc. (BOLD) has 4 SEC Form 4 insider filings on record in the last 90 days. That includes 3 insider purchases totalling $427K, and 1 sales totalling $54K. Most recent filing: Oct. 29, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Oct 29, 2026 SEC filing | TANG KEVIN 10% Owner | Bought | $25,697 | -0.8% 7D |
| Oct 26, 2026 SEC filing | TANG KEVIN 10% Owner | Bought | $51,619 | +2.3% 7D |
| Oct 20, 2026 SEC filing | TANG KEVIN 10% Owner | Bought | $349,593 | +3.0% 7D |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.