SEC Form 4 · accession 0001178579-26-000008
Boundless Bio, Inc. · BOLD
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Period of report
Jun 25, 2026
Accepted (ET)
Jun 29, 2026 · 7:56 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 | Jun 25, 2026 | P | 145,880 | $2.48 | A | 2,393,392 | I | By LP |
| Common StockF3,F2 | Jun 25, 2026 | P | 510 | $2.56 | A | 2,393,902 | I | By LP |
| Common StockF4,F2 | Jun 26, 2026 | P | 75,047 | $2.55 | A | 2,468,949 | I | By LP |
| Common StockF5,F2 | Jun 26, 2026 | P | 134 | $2.54 | A | 2,469,083 | I | By LP |
| Common StockF6,F2 | Jun 29, 2026 | P | 63,985 | $2.47 | A | 2,533,068 | I | By LP |
| Common StockF7,F2 | Jun 29, 2026 | P | 777 | $2.48 | A | 2,533,845 | I | By LP |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $2.42 to $2.56. 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 Footnotes 1 and 3 through 7.
- F2Tang Capital Partners, LP ("TCP") beneficially owns 580,669 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 791,839 shares, Tang Capital Partners III, Inc. ("TCP III") beneficially owns 580,668 shares, and Tang Capital Partners IV, Inc. ("TCP IV") beneficially owns 580,669 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.
- F3These shares were purchased in multiple transactions at prices ranging from $2.53 to $2.60.
- F4These shares were purchased in multiple transactions at prices ranging from $2.46 to $2.60.
- F5These shares were purchased in multiple transactions at prices ranging from $2.52 to $2.58.
- F6These shares were purchased in multiple transactions at prices ranging from $2.40 to $2.59.
- F7These shares were purchased in multiple transactions at prices ranging from $2.44 to $2.52.