X0609 4 2026-06-05 0001768446 Climb Bio, Inc. CLYM 0001685994 Cumbo Alexander false C/O CLIMB BIO, INC. 20 WILLIAM STREET, SUITE 145 WELLESLEY HILLS MA 02481 true false false false false Stock Option (Right to Buy) 10.55 2026-06-05 4 A false 40000 0 A 2036-06-04 Common Stock 40000 40000 D The shares subject to the option will vest on the earlier of June 5, 2027 or the date immediately prior to the date of the next annual meeting of stockholders, subject to the reporting person's continued service through such date. Exhibit Index: 24.1 - Power of Attorney Chandra Adams, as Attorney-in-Fact 2026-06-08