Automatic Data Processing (ADP)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-20 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: AUTOMATIC DATA PROCESSING INC (ADP) CIK: 0000008670 --- Reporting Owner --- Name: Kwon David CIK: 0001872194 Role: Officer (Corp VP) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-08-20 | Code: M (Exercise of derivative) Shares: +967 | Price: $169.84 Total Value: $164,235.28 Shares Owned After: 13,990.739 | 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 September 2025. [Transaction #2] Security: Common Stock Date: 2026-08-20 | Code: S (Open market sale) Shares: -798 | Price: $280.00 Total Value: $223,440.00 Shares Owned After: 13,192.739 | 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 September 2025. --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-08-20 | Code: M (Exercise of derivative) Shares: -967 | Price: $169.84 Exercise Price: $169.84 Exercisable: N/A | Expires: 2029-08-31 Shares Owned After: 0 | Ownership: D (Direct) --- 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 September 2025. --- Signature --- /s/ Michael A. Bonarti (POA on file) (2026-08-24)