Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 4

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 4
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 Trust Company, National Association (as successor in interest to U.S. Bank National Association) as trustee. The indenture includes certain covenants, including limitations on our ability 
 to:                                                                                                                                                                                                                                                   |

| • |     | create liens on our assets; and |

| • |     | merge or consolidate with another entity. |

| These covenants are subject to a number of important exceptions, limitations and qualifications that are described under “Description of Notes—Limitation on Liens” in this prospectus supplement and under 
 “Description of Debt Securities—Consolidation, Merger or Sale” in the accompanying prospectus.                                                                                                              |

| Listing | We do not intend to list the Notes on any national securities exchange. The Notes will be new securities for which there is currently no public market. |

| Form and Denomination | The Notes will be represented by one or more global securities registered in the name of the nominee of DTC. Beneficial interests in the global securities will be shown on, and transfers thereof will be effected only through, records maintained 
 by DTC and its participants including Clearstream Banking and Euroclear. The Notes will be issued only in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.                                                        |

S-3

| Governing Law | The indenture is, and the Notes will be, governed by the laws of the State of New York. |

| Trustee | U.S. Bank Trust Company, National Association. |

S-4

SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS This prospectus supplement and the accompanying prospectus 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. Forward-looking statements are subject to inherent risks and uncertainties. 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