X0609 4 2026-09-24 0002114044 Hemab Therapeutics Holdings, Inc. COAG 0002051489 Walbert Keli false C/O HEMAB THERAPEUTICS HOLDINGS, INC. 101 MAIN STREET, SUITE 1220 CAMBRIDGE MA 02142 true false false false false Stock Option (Right to Buy) 35.72 2026-09-24 4 A false 36000 0.00 A 2036-09-23 Common Stock 36000 36000 D This option was granted on September 24, 2026. The shares underlying the option are scheduled to vest over three years in equal monthly installments from September 24, 2026 through September 24, 2029, subject to continuous service. /s/ Mads Nikolaj Behrndt-Eriksen, as Attorney-in-Fact 2026-09-25