Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 40

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 40
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 the UK, this prospectus supplement and the accompanying prospectus are being distributed only to, and are directed only at, persons who are
“qualified investors” (as defined in the Prospectus Regulation as it forms part of domestic law by virtue of the UK Prospectus Regulation) who are (i) persons having professional experience in matters relating to investments falling
within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the “Order”), (ii) high net worth entities falling within Article 49(2)(a) to (d) of the Order, or (iii) persons to
whom it would otherwise be lawful to distribute it, all such persons together being referred to as “Relevant Persons.” In the UK, the Notes are only available to, and any invitation, offer or agreement to subscribe, purchase or otherwise
acquire such Notes will be engaged in only with, Relevant Persons. This prospectus supplement and the accompanying prospectus and their contents are confidential and should not be distributed, published or reproduced (in whole or in part) or
disclosed by any recipients to any other person in the UK. Any person in the UK that is not a Relevant Person should not act or rely on this prospectus supplement and the accompanying prospectus or their contents. The Notes are not being offered to
the public in the UK.

Notice to Prospective Investors in France

Neither this prospectus supplement nor any other offering material relating to the Notes described in this prospectus supplement has been
submitted to the clearance procedures of the Autorité des Marchés Financiers or

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of the competent authority of another member state of the European Economic Area and notified to the Autorité des Marchés Financiers. The Notes have not been offered or sold and will not be offered or sold, directly or indirectly, to the public in France. Neither this prospectus supplement nor any other offering material relating to the Notes has been or will be:

| • |     | released, issued, distributed or caused to be released, issued or distributed to the public in France; or |

| • |     | used in connection with any offer for subscription or sale of the Notes to the public in France. |

Such offers, sales and distributions will be made in France only:

| • |     | to qualified investors (investisseurs qualifiés) and/or to a restricted circle of investors                                                                                                                   
 (cercle restreint