144 0001437590 XXXXXXXX LIVE 0000078003 PFIZER INC 001-03619 66 HUDSON BOULEVARD EAST NEW YORK NY 10001-2192 2127332323 Dolsten Mikael Former Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

55000 1312736.00 5685365587 05/05/2025 NYSE Common 02/26/2022 Restricted Stock Vesting Issuer N 1 02/26/2022 Compensation Common 02/22/2023 Restricted Stock Vesting Issuer N 41570 02/22/2023 Compensation Common 02/25/2023 Restricted Stock Vesting Issuer N 13429 02/25/2023 Compensation Y G. M. Dolsten and Mikael Dolsten are one and the same person. 05/05/2025 /s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for G. M. Dolsten