X0609 4 2026-01-29 0002114044 Hemab Therapeutics Holdings, Inc. COAG 0001180432 MARAGANORE JOHN false C/O HEMAB THERAPEUTICS HOLDINGS, INC. 101 MAIN STREET, SUITE 1220 CAMBRIDGE MA 02142 true false false false false Common Stock 2026-05-04 4 C false 17974 A 17974 D Common Stock 2026-05-04 4 C false 17974 A 35948 D Warrants (Right to Buy) 6 2026-01-29 4 A false 107338 0 A 2036-01-28 Common Stock 107338 107338 D Series B Preferred Stock 2026-05-04 4 C false 817 0.00 D Common Stock 17974 0 D Series C Preferred Stock 2026-05-04 4 C false 817 0.00 D Common Stock 17974 0 D The warrant was granted on January 29, 2026. The shares underlying the warrant vest over three years in equal monthly installments from January 1, 2026 through January 1, 2029. Each share of Series B Preferred Stock and Series C Preferred Stock converted into 22 shares of common stock without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date. /s/ Mads Nikolaj Behrndt-Eriksen, as Attorney-in-Fact 2026-05-04