INVESTOR DAY 2025 June 12, 2025 | New York

DISCLAIMERS FORWARD-LOOKING STATEMENTS This document and other written or oral statements made from time to time by ADP may contain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Statements that are not historical in nature and which may be identified by the use of words like “outlook,” “expects,” “assumes,” “projects,” “anticipates,” “estimates,” “we believe,” “could,” “is designed to” and other words of similar meaning, are forward-looking statements. These statements are based on management’s expectations and assumptions and depend upon or refer to future events or conditions and are subject to risks and uncertainties that may cause actual results to differ materially from those expressed. Factors that could cause actual results to differ materially from those contemplated by the forward-looking statements or that could contribute to such difference include: ADP's success in obtaining and retaining clients, and selling additional services to clients; the pricing of products and services; the success of our new solutions; our ability to respond successfully to changes in technology, including artificial intelligence; compliance with existing or new legislation or regulations; changes in, or interpretations of, existing legislation or regulations; overall market, political and economic conditions, including interest rate and foreign currency trends and inflation; competitive conditions; our ability to maintain our current credit ratings and the impact on our funding costs and profitability; security or cyber breaches, fraudulent acts, and system interruptions and failures; employment and wage levels; availability of skilled associates; the impact of new acquisitions and divestitures; the adequacy, effectiveness and success of our business transformation initiatives; the impact of any uncertainties related to major natural disasters or catastrophic events; and supply-chain disruptions. ADP disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. These risks and uncertainties, along with the risk factors discussed under “Item 1A. Risk Factors” of our most recent Annual Report on Form 10-K, and in other written or oral statements made from time to time by ADP, should be considered in evaluating any forward-looking statements contained herein. This presentation contains non-GAAP financial metrics, including Adjusted EBIT margin and adjusted diluted earnings per share. For a discussion and reconciliation of historic non-GAAP financial metrics to their closest comparable GAAP financial metrics, see our earnings releases for the applicable periods presented, available at adp.investors.com or sec.gov. We have not provided a reconciliation of our revenue outlook (in organic constant currency), adjusted EBIT margin outlook or adjusted earnings per share outlook to their most comparable GAAP measures for such years because it would be potentially misleading and not practical given the difficulty of projecting event-driven transactional or other non-core operating items that are included in the GAAP metrics, including gains/losses on sales of businesses and assets and certain income tax adjustments. The reconciliations provided in earnings releases prepared by ADP are indicative of the reconciliation that will be prepared upon completion of the periods covered by the non-GAAP medium-term objectives. NON-GAAP MEASURES 2

AGENDA 3 Q&A and Closing Remarks09 Demos & Lunch10 Welcome01 Matt Keating VP, Investor Relations Vision & Strategy02 Maria Black President and CEO Best-in-Class Technology03 Sreeni Kutam President, Global Product & Innovation Go-to-Market04 David Foskett President, Global Sales North America HCM Solutions05 Joe DeSilva EVP, North America & Chief of Operations International HCM Solutions06 Virginia Magliulo EVP, Employer Services International HRO Solutions07 Brian Michaud EVP, Smart Compliance & HR Outsourcing Financial Framework08 Peter Hadley Corporate Treasurer & Incoming CFO

02 MARIA BLACK President and CEO Vision & Strategy 4

80%+ of Fortune 500 are clients 42M+ employees paid in 140+ countries and territories 1.1M+ clients $19B FY24 revenue $3.1T in client funds moved in US 78M employee tax statements processed 64K ADP associates 14M+ monthly users on app Data as of FY24 5 IS THE WORLD’S LARGEST HCM ORGANIZATION

Time Talent Payroll Benefits SUPPORTING EVERY CLIENT HCM NEED 6 HR HRO RetirementCompliance

SUPPORTING EVERY CLIENT SIZE Up-Market 1,000+ EEs Mid-Market 50-999 EEs Small Business 1-49 Employees (EEs) 7

140+ Countries and Territories SUPPORTING EVERY CLIENT LOCATION 8

Support for every client HCM need THAT ONLY COMES WITH SCALE D I F F E R E N T I A T I O N Support for every client size With global reach to support every client location 9

ADP OPERATES IN A LARGE AND GROWING MARKET Mid-single digits Expected growth rate over the medium term $180B HCM Total Addressable Market: • Payroll • HR • Benefits • Talent • HR Outsourcing • Analytics • Workforce Management Total addressable market data as of FY24. Sources: U.S. Census Bureau; U.S. Bureau of Labor Statistics; IDC; NelsonHall; World Bank; Moody’s Analytics; National Association of Professional Employer Organizations; and Internal ADP research and data. 10

$180B Addressable Market WHILE WE ARE THE BIGGEST, WE STILL HAVE RUNWAY 11 ADP Revenue $19B FY24 PayrollHR Time Benefits HRO Talent RetirementCompliance

MISSION-CRITICAL AND EVOLVING HUMAN CAPITAL MANAGEMENT IS 12

OUR CLIENTS FACE BIG CHALLENGES Demographic Shifts Rising Healthcare Costs Shrinking HR Teams Global Workforces Remote Work Instant and Streamlined Complex Regulations 13

OUR CLIENTS FACE BIG CHALLENGES Demographic Shifts Rising Healthcare Costs Shrinking HR Teams Global Workforces Remote Work Instant and Streamlined Complex Regulations D E P E N D A B I L I T Y 75 YEARS of solving client HCM challenges 14

15 AT ADP WE BELIEVE… that Integrity is Everything in providing Insightful Expertise in delivering Service Excellence in Inspiring Innovation that Each Person Counts in being Results-driven in valuing Social Responsibility

TRACK RECORD OF INNOVATION AND FIRSTS 1973 ADP International 2000 FIRST global cloud-based HCM solution 2009 FIRST HCM Mobile App 2014 FIRST HCM Marketplace 2018 FIRST digital pay solution 2023 Launched API Central 1962 ADP leases its first IBM computers 1998 FIRST cloud- based payroll solution 2006 National Employment Report (NER) 2012 ADP Data Cloud introduced 2021 FIRST app-based conversational payroll solution 2024 Deployed ADP Assist across platforms Launched ADP Lyric HCM Note: Timeline is sequential and may not be to scale. 16

ADP STRATEGIC PRIORITIES Lead with Best-in-Class HCM Technology Provide Unmatched Expertise and Outsourcing Benefit our clients with Global Scale 17

THE ADP INNOVATION FLYWHEEL BUYBUILD PARTNERINVEST ADP Ventures 18

WE HAVE BEEN EXECUTING AGAINST OUR PRIORITIES Enhancing product offering through organic and inorganic investments Expanding global reach through acquisitions and partnerships Deploying AI across product, service, and sales Driving strong financial outcomes 19

And our clients recognize it… RECORD HIGH CLIENT SATISFACTION Increase in ADP weighted average Net Promoter Score 40% over the last three years1 20 1 Measured by Net Promoter Score from Q3FY22 to Q3FY25

19th year Named by FORTUNE® Magazine as one of the “World’s Most Admired Companies” in 2025 Our execution is why ADP is … #1 HR Data Solution of the Year 2025 RECOGNIZED AS AN INDUSTRY LEADER Leader Everest Multi-Country Payroll Solutions 2024 #1 G2 Best Software Products for Small Businesses 2025 21

ADP IS BULLISH ON HCM AND OUR FUTURE IN IT Industry leading go-to-market Scale that sets us apart Operate in a dynamic market Durable financial performance Track record of innovation 22

03 SREENI KUTAM President, Global Product & Innovation Best-in-Class Technology 23

WE HAVE DONE A LOT… One Data One UX One Mobile Culture of Innovation Cloud Migration Marketplace 24 We have laid the groundwork, enabling us to innovate at a faster velocity

THE AI LANDSCAPE IS EVOLVING FAST Time Business Value Source: Internal research *RPA: Robotic Process Automation; AI/ML: Artificial Intelligence / Machine Learning; NLP: Natural Language Processing; GenAI: Generative AI Early automation RPA* Understanding language NLP* Data-driven insights Predictive Analytics (early stage of AI/ML*) AI Workflow GenAI* + RPA* Autonomous Agent Simple Agent Advanced Agent 25