144 0001866614 XXXXXXXX LIVE 0000008670 AUTOMATIC DATA PROCESSING INC 001-05397 ONE ADP BOULVARD ROSELAND NJ 07068 9739745000 D'Ambrosio Christopher Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

543 106286.82 402644364 04/14/2026 NASDAQ Common 05/10/2022 Stock Option Exercise Issuer N 34 05/10/2022 Cash Common 08/08/2022 Stock Option Exercise Issuer N 33 08/08/2022 Cash Common 08/09/2022 Stock Option Exercise Issuer N 90 08/09/2022 Cash Common 09/01/2022 Restricted Stock Vesting Issuee N 386 09/01/2022 Compensation N Christopher D'Ambrosio

One ADP Boulevard Roseland NJ 07068

Common 02/17/2026 543 115349.49 Christopher D'Ambrosio

One ADP Boulevard Roseland NJ 07068

Common 03/16/2026 543 113188.35 04/14/2026 09/07/2025 /s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Christopher D'Ambrosio