Form 4 Filing for Boundless Bio, Inc. - Officer/Director Stock Option Grant

This filing reports a stock option grant to Jennifer Lew, a director at Boundless Bio, Inc. (BOLD). The option, for 32,000 shares of Common Stock, was granted on June 15, 2026, with an exercise price of $1.40 per share and an expiration date of June 14, 2036. The option is set to vest in monthly installments over 12 months following the grant date, contingent upon Ms. Lew's continued service. This transaction is categorized as an equity offering, specifically the acquisition of stock options by a director.