Automatic Data Processing (ADP) 4: SWAN ROBERT HOLMES bought 3,619 shares of Common Stock at $… (May 11, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-07 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: AUTOMATIC DATA PROCESSING INC (ADP) CIK: 0000008670 --- Reporting Owner --- Name: SWAN ROBERT HOLMES CIK: 0001218363 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-07 | Code: P (Open market purchase) Shares: +3,619 | Price: $206.05 Total Value: $745,694.95 Shares Owned After: 5,072 | Ownership: D (Direct) Footnotes: [F1] The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in January 2026. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in January 2026. --- Signature --- /s/ David Kwon (POA on File) (2026-05-11)