Form 4 Filing for James Christensen at Boundless Bio, Inc.

This filing details a Form 4 submission by James Christensen, a director at Boundless Bio, Inc. (BOLD). On June 15, 2026, Christensen was granted a stock option to acquire 32,000 shares of Common Stock at an exercise price of $1.40 per share. The option vests over 12 months following June 15, 2026, with accelerated vesting on the date of the next annual stockholder meeting if it occurs before June 15, 2027, provided Christensen remains on the board. The option has an expiration date of June 14, 2036. This is a direct ownership transaction.