X0609 4 2026-09-14 0001850119 Century Therapeutics, Inc. IPSC 0001867305 Russotti Gregory false C/O CENTURY THERAPEUTICS, INC. 25 N 38TH STREET, 12TH FLOOR PHILADELPHIA PA 19104 false true false false See Remarks 0 Common Stock 2026-09-14 4 S 0 2587 1.93 D 509198 D Common Stock 92773 I By Gregory Russotti 2021 Family Trust The sales reported on this Form 4 represent the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. Such sales were automatic and not at the discretion of the Reporting Person. Title: Chief Technology and Manufacturing Officer /s/ Douglas Carr, Attorney-in-Fact 2026-09-15