Kevin Tang & Tang Capital Management Acquire Additional 57,210 Shares of Boundless Bio

This Form 4 filing reports that Kevin Tang and Tang Capital Management LLC, both 10% owners of Boundless Bio, Inc. (BOLD), have acquired additional shares of the company's common stock over three consecutive days in July 2026. Kevin Tang acquired 27,062 shares at $2.49 on July 6, 15,810 shares at $2.48 on July 7, and 14,338 shares at $2.46 on July 8, for a total of 57,210 shares. Following these purchases, their total ownership has increased to 2,698,518 shares. The filing notes that Kevin Tang has a pecuniary interest in the shares held through various Tang Capital entities, including Tang Capital Partners, LP and Tang Capital Partners International, LP. The transactions were executed at weighted-average prices within specified ranges, with Kevin Tang serving as the sole manager of Tang Capital Management LLC and having control over the investment entities involved. This represents continued accumulation of Boundless Bio shares by a significant shareholder.