Boundless Bio (BOLD)10% owner bought ~$647

~$647

Approx. value · 265 sh @ $2.44

2.85M

Holds after · shares reported

Traded

Jul 17, 2026

Filed

Jul 21, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Jun 22, 2026Company filing · Form 8-K · Material agreement, RestructuringAnnounced job cuts, closures or a restructuring, and control of the company changed hands (and 5 more items)“To the extent required by this Item, the information included in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference. Executive Transitions In connection with the Contemplated Transaction, effective July 1, 2026, Zachary D. Hornby will cease his role as President and Chief Executive Officer, and as a member of the board of directors of Boundless Bio.”
2. Jun 25, 2026Insider · 1 personInsiders: 2 purchases (~$363K)
3. Jun 26, 2026Insider · 1 personInsiders: 2 purchases (~$192K)
4. Jun 29, 2026Insider · 1 personInsiders: 2 purchases (~$160K)
5. Jun 30, 2026Insider · 1 personInsiders: 2 purchases (~$66K)
6. Jul 1, 2026Insider · 3 peopleInsiders: 1 purchase (~$178K), 2 sales (~$80K)
7. Jul 2, 2026Insider10% owner purchased ~$24K of BOLD shares in the open market
8. Jul 6, 2026Insider10% owner purchased ~$67K of BOLD shares in the open market
9. Jul 7, 2026Insider10% owner purchased ~$39K of BOLD shares in the open market
10. Jul 8, 2026Insider10% owner purchased ~$35K of BOLD shares in the open market
11. Jul 9, 2026Insider10% owner purchased ~$17 of BOLD shares in the open market
12. Jul 10, 2026Insider10% owner purchased ~$105K of BOLD shares in the open market
13. Jul 13, 2026Insider10% owner purchased ~$117K of BOLD shares in the open market
14. Jul 14, 2026Insider10% owner purchased ~$107K of BOLD shares in the open market
15. Jul 15, 2026Insider10% owner purchased ~$3.9K of BOLD shares in the open market
16. Jul 16, 2026Insider10% owner purchased ~$45K of BOLD shares in the open market
17. Jul 17, 2026 · this disclosureInsider10% owner purchased ~$647 of BOLD shares in the open market

What came next

1. Jul 20, 2026Insider10% owner purchased ~$4K of BOLD shares in the open market
2. Jul 21, 2026Insider10% owner purchased ~$7.3K of BOLD shares in the open market
3. Aug 26, 2026Insider10% owner sold ~$54K of BOLD shares in the open market
4. Aug 28, 2026Company filing · Form 8-K · Material agreementSigned an important agreement

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Boundless Bio

For Boundless Bio, OQRO holds 10 insider filings (SEC Form 4 or Form 144) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its BOLD page.

Other recent filings by TANG KEVIN, 10% owner

• SEC Form 4 at Boundless Bio (BOLD)Aug 28, 2026
• SEC Form 4 at Boundless Bio (BOLD)Jul 21, 2026
• SEC Form 4 at Boundless Bio (BOLD)Jul 21, 2026
• SEC Form 4 at Boundless Bio (BOLD)Jul 17, 2026
• SEC Form 4 at Boundless Bio (BOLD)Jul 17, 2026

The full history of TANG KEVIN, 10% owner is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Boundless Bio

• SEC Form 4Aug 28, 2026
• SEC Form 4Jul 21, 2026
• SEC Form 4Jul 21, 2026
• SEC Form 4Jul 17, 2026
• SEC Form 4Jul 17, 2026
• SEC Form 4Jul 17, 2026

Everything OQRO holds on this company is on its BOLD page.