X0508 4 2026-02-02 0001850119 Century Therapeutics, Inc. IPSC 0002001162 Pfeiffenberger Brent C/O CENTURY THERAPEUTICS, INC. 25 N 38TH STREET, 11TH FLOOR PHILADELPHIA PA 19104 true true false false President and CEO 0 Common Stock 2026-02-02 4 A 0 475000 0 A 3797990 D Stock Option (right to buy) 1.84 2026-02-02 4 A 0 945000 0 A 2036-02-02 Common Stock 945000 945000 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 25% on February 2, 2027, with the remaining 75% vesting on a quarterly basis for the three years thereafter, 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. The option vests 25% on February 2, 2027, with the remaining 75% vesting in 36 equal monthly installments, subject to the Reporting Person's continued service through each applicable vesting date. /s/ Douglas Carr, Attorney-in-Fact 2026-02-04