Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 48

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 48
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 series. A prospectus supplement relating to any series of debt securities being offered will include specific terms relating to the offering. The terms will be established in an officers’ certificate or a supplemental indenture. The officers’ certificate or supplemental indenture will be signed at the time of issuance and will contain important 2

information. The officers’ certificate or supplemental indenture will be filed as an exhibit to a Current Report on Form 8-Kof ADP, which will be publicly available. The officers’ certificate or supplemental indenture will include some or all of the following terms for a particular series of debt securities:

| • |     | the title of the securities; |

| • |     | any limit on the amount that may be issued; |

| • |     | whether or not the debt securities will be issued in global form and who the depositary will be; |

| • |     | the maturity date(s); |

| • |     | the interest rate or the method of computing the interest rate; |

| • |     | the date or dates from which interest will accrue, if any, or how such date or dates will be determined, and the 
 interest payment date or dates and any related record dates;                                                     |

| • |     | the place(s) where and the manner in which payments will be made; |

| • |     | ADP’s right, if any, to defer payment of interest and the maximum length of any deferral period; |

| • |     | the terms and conditions on which the debt securities may be redeemed at the option of ADP; |

| • |     | the date(s), if any, on which, and the price(s) at which ADP is obligated to redeem, or at the holder’s 
 option to purchase, such series of debt securities and other related terms and provisions;              |

| • |     | any provisions granting special rights to holders when a specified event occurs; |

| • |     | any changes to or additional events of default or covenants; |

| • |     | any special tax implications of the debt securities; |

| • |     | the denominations in which the debt securities will be issued, if other than denominations of $2,000 and whole 
 multiples of $1,000; and                                                                                       |

| • |     | any other specific terms of the securities that are not inconsistent with the indenture. (section 2.01) |

Fixed Rate Debt Securities Each fixed rate debt security will