Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 47

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 47
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 | the impact of any uncertainties related to major natural disasters or catastrophic events; and |

| • |     | supply chain disruptions. |

The factors identified above are not exhaustive. 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” in ADP’s most recently filed Annual Report on Form 10-Kshould be considered in evaluating any forward-looking statements contained herein. RISK FACTORS An investment in our securities involves risks. You should carefully consider each of the risks described in the section entitled “Risk Factors” in our Annual Report on Form 10-Kfor the fiscal year ended June 30, 2024, filed with the SEC on August 7, 2024, as such factors may be updated from time to time in our periodic filings with the SEC, which are accessible on the SEC’s website at www.sec.gov, and all of the other information included or incorporated by reference in this prospectus before deciding to invest in any of our securities. USE OF PROCEEDS Except as otherwise disclosed in a prospectus supplement, the net proceeds from the sale of the securities by us will be used for general corporate purposes. DESCRIPTION OF DEBT SECURITIES The debt securities will be our direct senior unsecured general obligations. The debt securities will be issued in one or more series under an indenture dated as of August 13, 2020, between us and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee. We have summarized all of the material provisions of the indenture below. The following description of the provisions of the indenture does not purport to be complete and is subject to, and qualified in its entirety by, reference to the indenture, which has been filed as an exhibit to the registration statement of which this prospectus forms a part, and you should read the indenture for provisions that may be important to you. In the summary below, we have included references to section numbers of the indenture so that you can easily locate these provisions. General The debt securities will be our direct senior unsecured general obligations. The debt securities will rank equally with all of our other senior and unsubordinated debt. The provisions of the indenture allow us to “reopen” a previous issue of a series of debt securities and issue additional debt securities of that