SEC Form 4 · accession 0001178579-26-000017
Boundless Bio, Inc. · BOLD
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Period of report
Jul 17, 2026
Accepted (ET)
Jul 21, 2026 · 7:38 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001782303
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1,F2 | Jul 17, 2026 | P | 265 | $2.44 | A | 2,854,337 | I | See Footnote |
| Common StockF1,F2 | Jul 20, 2026 | P | 1,623 | $2.44 | A | 2,855,960 | I | See Footnote |
| Common StockF1,F2 | Jul 21, 2026 | P | 2,975 | $2.44 | A | 2,858,935 | I | See Footnote |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The prices reported are weighted-average prices. These shares were all purchased at $2.44. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the SEC staff, upon request, all information regarding the number of shares purchased at each price within the ranges set forth in Footnote 1.
- F2Tang Capital Partners, LP ("TCP") beneficially owns 655,170 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 893,434 shares, Tang Capital Partners III, Inc. ("TCP III") beneficially owns 655,161 shares, and Tang Capital Partners IV, Inc. ("TCP IV") beneficially owns 655,170 shares. Kevin Tang is the sole manager of Tang Capital Management, LLC, which is the general partner of TCP and TCPI. Kevin Tang is the sole director and Chief Executive Officer of TCP III and TCP IV, which are indirectly wholly owned by TCP. Mr. Tang has a pecuniary interest in the shares beneficially held by TCP, TCPI, TCP III and TCP IV.