Insider Transaction Report for Boundless Bio, Inc.

This filing details insider transactions for Boundless Bio, Inc. (BOLD) between July 17 and July 21, 2026. Kevin Tang and Tang Capital Management LLC, both identified as ten percent owners, acquired shares of Common Stock. Specifically, on July 17, 265 shares were acquired at a weighted-average price of $2.44, bringing the post-transaction total to 2,854,337 shares. On July 20, an additional 1,623 shares were acquired at the same weighted-average price, resulting in 2,855,960 shares. The final transaction reported occurred on July 21, with 2,975 shares acquired at $2.44, leading to a total of 2,858,935 shares. The filing indicates that these transactions were purchases and that the ownership is indirect, with detailed beneficial ownership information provided in Footnote 2.