Company: ADP
Filing Date: 2025-09-25
Form Type: DEF 14A
Source: 0001308179-25-000607
Chunk: 109

Company: AUTOMATIC DATA PROCESSING INC
Filing Date: 2025-09-25
Form: DEF 14A
Chunk 109
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 partnership name by authorized officer.

| Signature [PLEASE SIGN WITHIN BOX] |     | Date |     | Signature (Joint Owners) |     | Date |

September 25, 2025 Dear Stockholder: You are cordially invited to join us at the 2025 Annual Meeting of Stockholders of Automatic Data Processing, Inc. This year’s meeting will be held on Wednesday, November 12, 2025, starting at 10:00 a.m. Eastern Standard Time at www.virtualshareholdermeeting.com/ADP2025. I hope you will be able to participate. At the meeting, we will (i) elect directors, (ii) hold an advisory vote on executive compensation, and (iii) vote on the ratification of the appointment of auditors. It is important that these shares be voted, whether or not you plan to be present at the meeting. You should specify your choices by marking the appropriate boxes on the proxy form on the reverse side, and date, sign and return your proxy form in the enclosed, postage-paid return envelope as promptly as possible. Alternatively, you may vote by phone or the Internet, as described on the reverse side. If you date, sign and return your proxy form without specifying your choices, these shares will be voted in accordance with the recommendation of the Company's directors. To participate in the virtual meeting, you will need the 16-digit control number that is printed in the blue box on your Notice of Internet Availability of Proxy Materials or in the box marked by the arrow on your proxy card (if you received a printed copy of the proxy materials). If the shares are held in the name of a bank, brokerage firm or other nominee, you should follow the instructions provided by them in order to participate in the virtual meeting. We recommend that you log in 15 minutes before the start of the 2025 Annual Meeting to ensure sufficient time to complete the check-in procedures. As in the past years, we will discuss the business of the Company and its subsidiaries during the meeting. I welcome your comments and suggestions, and we will provide time during the meeting for questions from stockholders.

| Sincerely,                             |
| Maria Black                            
 President and Chief Executive  Officer |

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Combined Document containing the Notice of 2025 Annual Meeting of Stockholders, Proxy Statement and
Annual Report on Form 10-K is available at www.proxyvote.com.

| V78941-P36288 |

Proxy This proxy is solicited