BOLDHealthcareMicro-Cap
Boundless Bio, Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for Boundless Bio, Inc. (BOLD), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are BOLD insiders buying or selling?
Boundless Bio, Inc. insiders reported 9 open-market buys ($16.1M) and 2 sells ($79.7K) across 11 Form 4 filings — a net buying position of $16.0M.
Source: SEC EDGAR Form 4
Key Statistics (as of Jul 17, 2026)
Total Form 4 filings
11
SEC EDGAR
Insider filers
5
Insider buys (9)
$16.1M
Insider sells (2)
$79.7K
Insider sentiment
Net buyingNet insider flow of $16.0M in net buying. 5 insider buys in the last 90 days.
Recent BOLD insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 17, 2026 | Kevin Tang | 10% Owner | Purchase | 64.0K | $2.43 | $155.6K |
| Jul 13, 2026 | Kevin Tang | 10% Owner | Purchase | 91.6K | $2.42 | $222.1K |
| Jul 9, 2026 | Kevin Tang | 10% Owner | Purchase | 57.2K | $2.48 | $141.9K |
| Jul 6, 2026 | Keith Crandell | 10% Owner | Sale | 16.0K | $2.49 | $39.8K |
| Jul 6, 2026 | ARCH Venture Fund IX, L.P. | 10% Owner | Sale | 16.0K | $2.49 | $39.8K |
| Jul 2, 2026 | Kevin Tang | 10% Owner | Purchase | 107.5K | $2.50 | $268.9K |
| Jun 29, 2026 | Kevin Tang | 10% Owner | Purchase | 286.3K | $2.50 | $714.8K |
| Apr 4, 2024 | Kristina Burow | Director, 10% Owner | Purchase | 200.0K | $16.00 | $3.2M |
| Apr 4, 2024 | Keith Crandell | 10% Owner | Purchase | 200.0K | $16.00 | $3.2M |
| Apr 4, 2024 | ARCH Venture Fund IX, L.P. | 10% Owner | Purchase | 200.0K | $16.00 | $3.2M |
| Apr 4, 2024 | Peter Kolchinsky | 10% Owner | Purchase | 312.5K | $16.00 | $5.0M |
Showing the 11 most recent of 11 Form 4 filings for Boundless Bio, Inc..
Most active BOLD insiders
- Kevin Tang5 filings
- ARCH Venture Fund IX, L.P.2 filings
- Keith Crandell2 filings
- Kristina Burow1 filing
- Peter Kolchinsky1 filing
Ask anything about BOLD insider activity
Use Trabud's AI agent to query Boundless Bio, Inc.'s Form 4 history in plain English — "Show me BOLD CEO purchases this year" or compare it against any other ticker.
Open the AI agentBOLD insider trading FAQ
Are Boundless Bio, Inc. insiders buying or selling?
Across 11 SEC Form 4 filings, Boundless Bio, Inc. (BOLD) insiders reported 9 open-market purchases totaling $16.1M and 2 sales totaling $79.7K. That is a net buying position of $16.0M.
How many insiders trade BOLD stock?
5 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for Boundless Bio, Inc.. The most recent filing was accepted on Jul 17, 2026.
Where does Trabud get BOLD insider trading data?
All BOLD insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.
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