X0508 4 2024-09-12 0000008670 AUTOMATIC DATA PROCESSING INC ADP 0001378514 Rodriguez Carlos A ONE ADP BOULEVARD ROSELAND NJ 07068 1 1 Common Stock 2024-09-12 4 M 0 21949.0000 206.8600 A 58690.0761 D Common Stock 2024-09-12 4 S 0 2293.0000 276.5398 D 56397.0761 D Common Stock 2024-09-12 4 S 0 3000.0000 274.4920 D 53397.0761 D Common Stock 2024-09-12 4 S 0 3791.0000 277.6923 D 49606.0761 D Common Stock 2024-09-12 4 S 0 5402.0000 275.5649 D 44204.0761 D Common Stock 2024-09-12 4 S 0 7463.0000 278.3928 D 36741.0761 D Common Stock 2024-09-13 4 M 0 21950.0000 206.8600 A 58691.0761 D Common Stock 2024-09-13 4 S 0 2300.0000 276.8347 D 56391.0761 D Common Stock 2024-09-13 4 S 0 2383.0000 278.3720 D 54008.0761 D Common Stock 2024-09-13 4 S 0 17267.0000 277.7033 D 36741.0761 D Common Stock 13813.0000 I By Trust Stock Option (Right to Buy) 206.8600 2024-09-12 4 M 0 21949.0000 206.8600 D 2022-09-01 2031-08-31 Common Stock 21949.0000 65850.0000 D Stock Option (Right to Buy) 206.8600 2024-09-13 4 M 0 21950.0000 206.8600 D 2022-09-01 2031-08-31 Common Stock 21950.0000 43900.0000 D The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2023. David Kwon (POA on File) 2024-09-16