SEC Form 4 · accession 0001178579-26-000018
Boundless Bio, Inc. · BOLD
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Period of report
Aug 26, 2026
Accepted (ET)
Aug 28, 2026 · 4:16 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 StockF2,F3 | Aug 26, 2026 | S | 18,300 | $2.97 | D | 2,840,635 | I | See Footnote |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The Reporting Persons have delivered to the Issuer the full amount of the disgorgeable profit arising the sale reported herein, in the amount of $10,046.70.
- F2The price reported herein is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $2.90 to $3.03. 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 sold at each price within the range set forth in Footnote 2.
- F3Tang Capital Partners, LP ("TCP") beneficially owns 655,170 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 887,715 shares, Tang Capital Partners III, Inc. ("TCP III") beneficially owns 655,161 shares, and Tang Capital Partners IV, Inc. ("TCP IV") beneficially owns 642,589 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.