Form 4 Filing for Thomas Stephen Basil

This filing details a Form 4 filed by Thomas Stephen Basil, a director at Climb Bio, Inc. On June 5, 2026, Mr. Basil was granted 40,000 stock options to acquire common stock. The options have an exercise price of $10.55 per share and an expiration date of June 4, 2036. These options are subject to vesting conditions, including continued service through the vesting date, which is the earlier of June 5, 2027, or the day before the next annual stockholder meeting. The filing was signed on June 8, 2026, by Chandra Adams as Attorney-in-Fact.