Company: ADP
Filing Date: 2025-05-07
Form Type: 424B2
Source: 0001193125-25-114878
Chunk: 57

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-05-07
Form: 424B2
Chunk 57
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enture; Waiver Without the consent of any holders of debt securities, ADP and the trustee may change the indenture:

| • |     | to fix any ambiguity, defect or inconsistency in the indenture; |

| • |     | to effect the assumption of a successor corporation of our obligations under the indenture and the outstanding 
 debt securities;                                                                                               |

| • |     | to add to our covenants for the benefit of the holders of all or any series of debt securities under the 
 indenture or surrender any right or power we have under the indenture;                                   |

| • |     | to change anything that does not materially adversely affect the interests of any holder of debt securities of 
 any series; and                                                                                                |

| • |     | to effect certain other limited purposes described in the indenture. (section 9.01) |

The rights of holders of a series of debt securities may be changed by ADP and the trustee with the written consent of the holders of a majority of the aggregate principal amount of the outstanding debt securities of all 8

series then outstanding under the indenture (all such series voting together as a single class). However, the following changes may only be made with the consent of each holder of debt securities of each series affected by the change:

| • |     | extending the fixed maturity; |

| • |     | reducing the principal amount; |

| • |     | reducing the rate of or extending the time of payment of interest; |

| • |     | reducing any premium payable upon redemption; or |

| • |     | reducing the percentage of debt securities referred to above, the holders of which are required to consent to any 
 amendment. (section 9.02)                                                                                         |

Form, Exchange, and Transfer The debt securities of each series will be issued in fully registered form without coupons in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. The indenture provides that debt securities of a series may be issued in temporary or permanent global form and may be issued as book-entry securities that will be deposited with The Depository Trust Company or another depositary named by ADP and identified in a prospectus supplement with respect to such series. (sections 2.03, 2.06 and 2.11) A holder of debt securities of any series can exchange such debt securities for other debt securities of the same series, in any authorized denomination and with the same terms and aggregate principal amount. A holder