AUTOMATIC DATA PROCESSING INC (ADP) · Initial Holdings (Form 3) SEC Filing

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-08-05 --- Issuer --- Name: AUTOMATIC DATA PROCESSING INC (ADP) CIK: 0000008670 --- Reporting Owner --- Name: Orihuela Samantha D CIK: 0002148725 Role: Officer (Chief Marketing Officer) --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) Footnotes: [F1] In the form of restricted stock units ("RSUs"), which are convertible into common stock on a one-for-one basis and reflects RSU grants made in 2026, with 417 RSUs vesting 2/2/27; 4,456 RSUs vesting 2/2/28 and 418 RSUs vesting 2/2/29 [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F2] In the form of restricted stock units ("RSUs"), which are convertible into common stock on a one-for-one basis and reflects RSU grants made in 2023 through 2025, with all such RSUs vesting 9/1/26. [Holding #3] Security: Stock Option (Right to Buy) Ownership: I (Indirect) [Holding #4] Security: Stock Option (Right to Buy) Ownership: I (Indirect) [Holding #5] Security: Stock Option (Right to Buy) Ownership: I (Indirect) [Holding #6] Security: Stock Option (Right to Buy) Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: In the form of restricted stock units ("RSUs"), which are convertible into common stock on a one-for-one basis and reflects RSU grants made in 2026, with 417 RSUs vesting 2/2/27; 4,456 RSUs vesting 2/2/28 and 418 RSUs vesting 2/2/29 F2: In the form of restricted stock units ("RSUs"), which are convertible into common stock on a one-for-one basis and reflects RSU grants made in 2023 through 2025, with all such RSUs vesting 9/1/26. --- Signature --- /s/ David Kwon (POA on File) (2026-08-06)