X0609 4 2026-09-01 0000008670 AUTOMATIC DATA PROCESSING INC ADP 0001608466 Black Maria false ONE ADP BOULEVARD ROSELAND NJ 07068 1 President & CEO 1 Common Stock 2026-09-01 4 A 0 21689.0000 0.0000 A 141649.6340 D Common Stock 2026-09-01 4 F 0 31215.4620 283.4900 D 110434.1720 D Common Stock 2026-09-02 4 S 0 214.0000 279.2119 D 110220.1720 D Common Stock 2026-09-02 4 S 0 256.0000 279.4446 D 109964.1720 D Common Stock 2026-09-02 4 S 0 559.0000 279.9339 D 109405.1720 D Common Stock 2026-09-02 4 S 0 610.0000 281.8625 D 108795.1720 D Common Stock 2026-09-02 4 S 0 700.0000 278.5886 D 108095.1720 D Common Stock 2026-09-02 4 S 0 760.0000 281.6961 D 107335.1720 D Common Stock 2026-09-02 4 S 0 786.0000 280.2682 D 106549.1720 D Common Stock 2026-09-02 4 S 0 1018.0000 281.5993 D 105531.1720 D Common Stock 2026-09-02 4 S 0 1018.0000 280.5952 D 104513.1720 D Common Stock 2026-09-02 4 S 0 1193.0000 280.9598 D 103320.1720 D Common Stock 2026-09-02 4 S 0 1483.0000 281.1319 D 101837.1720 D Common Stock 2026-09-02 4 S 0 2898.0000 279.7355 D 98939.1720 D Common Stock 2026-09-02 4 S 0 7724.0000 281.6597 D 91215.1720 D Common Stock 2026-09-02 4 S 0 10591.0000 280.8179 D 80624.1720 D In the form of restricted stock units, which are convertible into common stock on a one-for-one basis and vest ratably over 3 years. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025. David Kwon (POA on File) 2026-09-03