Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 61

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 61
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 and will have no established trading market. Any underwriters to whom securities are sold for public offering and sale may make a market in the securities, but such underwriters will not be obligated to
do so and may discontinue any market making at any time without notice. The securities may or may not be listed on a national securities exchange.

VALIDITY OF SECURITIES

The validity of the securities in respect of which this prospectus is being delivered will be passed on for us by Davis Polk &
Wardwell LLP.

EXPERTS

The financial statements of Automatic Data Processing, Inc. incorporated by reference in this prospectus, and the effectiveness of Automatic
Data Processing, Inc.’s internal control over financial reporting, have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports. Such financial statements are incorporated by
reference in reliance upon the reports of such firm given their authority as experts in accounting and auditing.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with
the SEC. The SEC maintains an Internet site at http://www.sec.gov, from which interested persons can electronically access our SEC filings, including the registration statement of which this prospectus forms a part and the exhibits and schedules
thereto.

We also maintain a website that contains additional information about us at www.adp.com. We are not incorporating the contents
of the website into this prospectus.

This prospectus is part of a registration statement on Form
S-3 that we filed with the SEC. You may obtain the full registration statement from the SEC or us, as indicated below. This prospectus, which is part of the registration statement, does not contain all of the
information set forth in the registration statement and the exhibits and schedules to the registration statement. We filed or incorporated by reference the form of indenture and other documents establishing the terms of the offered securities as
exhibits to the registration statement. Statements in this prospectus or any supplement about these documents are summaries. You should refer to the actual documents for a more complete description of the relevant matters.

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

The SEC allows us to “incorporate by reference” the information we file with the SEC, which means that we can disclose important
information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC