AUTOMATIC DATA PROCESSING INC 10-Q

Item 5. Other Information (c) During the fiscal quarter ended December 31, 2025, none of the Company’s directors or executive officers adopted or terminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement”. 43 Item 6. Exhibits Exhibit Number Exhibit 31.1 Certification by Maria Black pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934 31.2 Certification by Peter Hadley pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934 32.1 Certification by Maria Black pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 32.2 Certification by Peter Hadley pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 101.INS Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH Inline XBRL Taxonomy Extension Schema 101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase 101.LAB Inline XBRL Taxonomy Label Linkbase 101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase 101.DEF Inline XBRL Taxonomy Extension Definition Document 104 Cover Page Interactive Data File - the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 44 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. AUTOMATIC DATA PROCESSING, INC. (Registrant) Date: January 29, 2026 /s/ Peter Hadley Peter Hadley Chief Financial Officer (Title) 45