$BOLD insider trading
Over the last 12 months, Boundless Bio insiders reported 6 buys totaling $1.5M and 3 sales totaling $134K across SEC Form 4 filings.
- Bought · 12m
- $1.5M 6 events
- Sold · 12m
- $134K 3 events
- Events · 12m
- 9 Form 4 filings, grouped
- Insiders · 12m
- 3 distinct reporters
- 10b5-1 share
- 0% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Aug 26, 2026 | TANG KEVIN10% | ▼ Sale | 18,300 | $2.97 | $54K | -0.6% | indirect |
| Jul 21, 2026 | TANG KEVIN10% | ▲ Buy | 4,863 | $2.44 | $12K | +0.2% | 3 tranches · indirect |
| Jul 16, 2026 | TANG KEVIN10% | ▲ Buy | 63,969 | $2.43 | $156K | +2.3% | 3 tranches · indirect |
| Jul 13, 2026 | TANG KEVIN10% | ▲ Buy | 91,585 | $2.42 | $222K | +3.4% | 3 tranches · indirect |
| Jul 8, 2026 | TANG KEVIN10% | ▲ Buy | 57,210 | $2.48 | $142K | +2.2% | 3 tranches · indirect |
| Jul 2, 2026 | TANG KEVIN10% | ▲ Buy | 107,463 | $2.5 | $269K | +4.2% | 4 tranches · indirect |
| Jul 1, 2026 | CRANDELL KEITH10% | ▼ Sale | 16,000 | $2.49 | $40K | -100% | indirect |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P.10% | ▼ Sale | 16,000 | $2.49 | $40K | -100% | indirect |
| Jun 29, 2026 | TANG KEVIN10% | ▲ Buy | 286,333 | $2.5 | $715K | +12.7% | 6 tranches · indirect |
Every $BOLD filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Boundless Bio filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $BOLD feed.