Q3 Fiscal 2023 Earnings Supplement

Governance: Best-in-Class Board With Balanced Skill Set Deliberate Board Composition ■ Commitment to both continuity and fresh perspectives 6 of our 12 Directors have a tenure of 5 years or less¹ Average independent Director tenure of 5.8 years¹, compared to an S&P 500 average of 7.8 years 42% (5 of 12) women; 25% (3 of 12) racially diverse ■ Director succession planning Conducted in the context of a skill set review Skill set used to identify and recruit Directors ■ The right set of skills and experience to set ADP's corporate strategy 8 of 10 independent Directors are current or former C-Suite of major public companies Leaders with significant technology experience (Peter Bisson, David Goeckeler, Linnie Haynesworth, Fran Katsoudas, Nazzic Keene, Tom Lynch, Bill Ready) Independent mindset and focus on accountability to shareholders 10 of 12 Directors are independent All Board Committees are composed of independent Directors Committed to formal shareholder engagement program Ongoing board refreshment Skill Set Aligns and Evolves With Corporate Strategy Director Skill Set² Business Operations Cybersecurity Government/Regulatory HR Management/Compensation 10 4 Enterprise Risk Management 8 Financial Expertise 5 7 Capital Markets Industry/HCM/HRO 8 International 11 Product Marketing/Product Management 7 Public Company CEO Experience Other Public Company Board Experience 7 10 Strategic Planning 11 Technology 7 Transformation Experience 10 Source: Spencer Stuart Board Index 2022 1. As of February 2023 (10 independent directors; 2 management directors) 2. Skill set matrix as of November 2022 (11 Directors) Copyright © 2023 ADP, Inc. 20 ADP

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