ADP officer plans $530K Rule 144 stock sale

ADP officer Christopher D'Ambrosio has filed under Rule 144 to sell 1,872 shares, received via restricted stock vesting.

Rhea-AI Filing Summary

AUTOMATIC DATA PROCESSING INC (ADP) is the issuer for a planned sale of its common stock reported under Rule 144. An officer, Christopher D'Ambrosio, through Fidelity Brokerage Services LLC, has filed to sell 1,872 shares of ADP common stock on NASDAQ. These shares were acquired on September 1, 2026 via restricted stock vesting as compensation, with an indicated aggregate market value of $529,776.00 at the time of the notice.

Key Figures

Shares proposed to be sold: 1,872 shares Aggregate market value: $529,776.00 Planned sale trading market: NASDAQ +1 more

4 metrics

Shares proposed to be sold 1,872 shares ADP common stock under Rule 144 notice

Aggregate market value $529,776.00 Value of 1,872 ADP shares in the Form 144

Planned sale trading market NASDAQ Listing venue for the ADP common stock to be sold

Acquisition date of shares September 1, 2026 Date the 1,872 ADP shares vested as restricted stock

Key Terms

Rule 144, Restricted Stock Vesting, Compensation, attorney-in-fact

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 09/01/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Compensation financial

"09/01/2026 | Compensation"

attorney-in-fact regulatory

"as attorney-in-fact for Christopher D'Ambrosio"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

What insider sale was reported for ADP in this Form 144 filing?

The filing reports that 1,872 shares of AUTOMATIC DATA PROCESSING INC common stock are proposed to be sold on NASDAQ by officer Christopher D'Ambrosio through Fidelity Brokerage Services LLC under Rule 144.

What is the approximate value of ADP shares covered by this Form 144?

The Form 144 lists an aggregate market value of approximately $529,776.00 for the 1,872 ADP common shares proposed to be sold.

How and when were the ADP shares in this Form 144 acquired?

The 1,872 ADP common shares were acquired on September 1, 2026 through Restricted Stock Vesting, characterized as compensation to the officer.

Who is the person for whose account the ADP securities will be sold?

The securities are to be sold for the account of Christopher D'Ambrosio, identified as an officer in relation to AUTOMATIC DATA PROCESSING INC.

Which broker is handling the proposed Rule 144 sale of ADP shares?

The proposed sale of ADP common stock is associated with Fidelity Brokerage Services LLC, which appears as the broker in the securities information section.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/02/2026 - 11:42 AM Accepted by SEC EDGAR 09/02/2026 - 11:42 AM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001866614
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	AUTOMATIC DATA PROCESSING INC
SEC File Number	001-05397
Address of Issuer	ONE ADP BOULVARD ROSELAND NEW JERSEY 07068
Phone	9739745000
Name of Person for Whose Account the Securities are To Be Sold	D'Ambrosio Christopher
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	1872	529776.00	397262737	09/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/01/2026	Restricted Stock Vesting	Issuer			1872	09/01/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	09/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/07/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Christopher D'Ambrosio
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)