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Kevin Tang - 10% OwnerOpen-market sale$54K- Kevin TangOpen-market purchase$647
About Boundless Bio, Inc. (BOLD)
Boundless Bio, Inc. files with the SEC under CIK 0001782303 and is classified as pharmaceutical preparations. It is grouped with Health Care companies on this site.
BOLD Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market purchase | 6 | 68,832 | $168K |
| Open-market sale | 1 | 18,300 | $54K |
BOLD insider transactions (Form 4)
3919 Form 4 filings on record, the earliest from Jun 23, 2025, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Kevin Tang - 10% Owner | Open-market sale | Common Stock | 18,300 | $2.97 footnote F2 | $54K | |
| ||||||
| Kevin Tang | Open-market purchase | Common Stock | 265 | $2.44 footnote F1 | $647 | |
| Kevin Tang | Open-market purchase | Common Stock | 1,623 | $2.44 footnote F1 | $4K | |
| Kevin Tang | Open-market purchase | Common Stock | 2,975 | $2.44 footnote F1 | $7K | |
| ||||||
| Kevin Tang | Open-market purchase | Common Stock | 43,878 | $2.43 footnote F1 | $107K | |
| Kevin Tang | Open-market purchase | Common Stock | 1,600 | $2.44 footnote F3 | $4K | |
| Kevin Tang | Open-market purchase | Common Stock | 18,491 | $2.44 footnote F4 | $45K | |
| ||||||
| Kevin Tang | Open-market purchase | Common Stock | 7 | $2.48 footnote F1 | $17 | |
| Kevin Tang | Open-market purchase | Common Stock | 43,367 | $2.43 footnote F3 | $105K | |
| Kevin Tang | Open-market purchase | Common Stock | 48,211 | $2.42 footnote F4 | $117K | |
| ||||||
| Kevin Tang | Open-market purchase | Common Stock | 27,062 | $2.49 footnote F1 | $67K | |
| Kevin Tang | Open-market purchase | Common Stock | 15,810 | $2.48 footnote F3 | $39K | |
| Kevin Tang | Open-market purchase | Common Stock | 14,338 | $2.46 footnote F4 | $35K | |
| ||||||
| Keith Crandell - 10% Owner | Option exercise | Common Stock | 16,000 | $1.03 | $16K | |
| Keith Crandell - 10% Owner | Open-market sale | Common Stock | 16,000 | $2.49 | $40K | |
| Keith Crandell - 10% Owner | Option exercise | Stock Option (right to buy) | 16,000 | $0.00 | - | |
| ARCH Venture Fund IX, L.P. - 10% Owner | Option exercise | Common Stock | 16,000 | $1.03 | $16K | |
| ARCH Venture Fund IX, L.P. - 10% Owner | Open-market sale | Common Stock | 16,000 | $2.49 | $40K | |
| ARCH Venture Fund IX, L.P. - 10% Owner | Option exercise | Stock Option (right to buy) | 16,000 | $0.00 | - | |
| Kevin Tang | Open-market purchase | Common Stock | 25,930 | $2.54 footnote F1 | $66K | |
| Kevin Tang | Open-market purchase | Common Stock | 100 | $2.50 footnote F3 | $250 | |
| Kevin Tang | Open-market purchase | Common Stock | 71,612 | $2.49 footnote F4 | $178K | |
| Kevin Tang | Open-market purchase | Common Stock | 9,821 | $2.49 footnote F5 | $24K | |
| ||||||
| Kevin Tang | Open-market purchase | Common Stock | 145,880 | $2.48 footnote F1 | $362K | |
| Kevin Tang | Open-market purchase | Common Stock | 510 | $2.56 footnote F3 | $1K | |
| Kevin Tang | Open-market purchase | Common Stock | 75,047 | $2.55 footnote F4 | $191K | |
| Kevin Tang | Open-market purchase | Common Stock | 134 | $2.54 footnote F5 | $340 | |
| Kevin Tang | Open-market purchase | Common Stock | 63,985 | $2.47 footnote F6 | $158K | |
| Kevin Tang | Open-market purchase | Common Stock | 777 | $2.48 footnote F7 | $2K | |
| ||||||
| Nancy Whiting | Grant or award | Stock Option (right to buy) | 32,000 | $0.00 | - | |
 Jonathan E. Lim | Grant or award | Stock Option (right to buy) | 48,000 | $0.00 | - | |
| James Christensen | Grant or award | Stock Option (right to buy) | 32,000 | $0.00 | - | |
 Jennifer Lew | Grant or award | Stock Option (right to buy) | 32,000 | $0.00 | - | |
 Jessica Oien - Officer | Grant or award | Stock Option (right to buy) | 220,000 | $0.00 | - | |
 Christian Hassig - Officer | Grant or award | Stock Option (right to buy) | 230,000 | $0.00 | - | |
 Robert Doebele - Officer | Grant or award | Stock Option (right to buy) | 230,000 | $0.00 | - | |
| Zachary Hornby - Officer | Grant or award | Stock Option (right to buy) | 600,000 | $0.00 | - | |
 David A. Hinkle - Officer | Grant or award | Stock Option (right to buy) | 140,000 | $0.00 | - | |
| Jonathan E. Lim | Grant or award | Stock Option (right to buy) | 24,000 | $0.00 | - | |
Item 1.01, 9.01
Item 1.01, 2.05, 3.02, 5.01, 5.02, 7.01, 8.01, 9.01
Item 5.07
Item 2.02, 9.01
BOLD insider trading FAQ
What is the latest insider trade for BOLD?
Boundless Bio, Inc. (BOLD) had 3 insider filings in the last 90 days, with the most recent on 2026-08-28. The full record for BOLD runs to 19 Form 4 filings, the earliest from 2025-06-23. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying BOLD stock?
6 insider purchases of BOLD were filed in the last 90 days, totaling $168K.
How many insiders are selling BOLD stock?
1 insider sale of BOLD was filed in the last 90 days, totaling $54K.
Where can I see BOLD SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects BOLD Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Kevin Tang view on EDGAR
- - Kevin Tang view on EDGAR
- - Kevin Tang view on EDGAR
- - Kevin Tang view on EDGAR
- - Kevin Tang view on EDGAR
- - Keith Crandell view on EDGAR
- - ARCH Venture Fund IX, L.P. view on EDGAR
- - Kevin Tang view on EDGAR
- - Kevin Tang view on EDGAR
Related companies with recent insider activity
Learn more
- How to read insider buying signals
- What an open-market purchase by an insider can and cannot tell you.
- Insider activity in Health Care
- Where BOLD's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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