X0508 4 2025-08-14 0001850119 Century Therapeutics, Inc. IPSC 0002001162 Pfeiffenberger Brent C/O CENTURY THERAPEUTICS, INC. 25 N 38TH STREET, 11TH FLOOR PHILADELPHIA PA 19104 1 1 0 0 President and CEO 0 Common Stock 2025-08-14 4 A 0 1587614 0 A 3269397 D Reflects the grant of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of Issuer common stock. The RSUs vest 50% on August 14, 2027, with the remaining 50% vesting on August 14, 2028, in each case subject the Reporting Person's continued service through the applicable vesting date. The RSUs will be settled on each applicable vesting date in shares of the Issuer's common stock. /s/ Douglas Carr, Attorney-in-Fact 2025-08-18