ADP executive sells 543 shares in planned trade

AUTOMATIC DATA PROCESSING INC corporate vice president Christopher D’Ambrosio reported an open-market sale of 543 shares of Common Stock at $208.45 per share.

Rhea-AI Filing Summary

AUTOMATIC DATA PROCESSING INC corporate vice president Christopher D’Ambrosio reported an open-market sale of 543 shares of Common Stock at $208.45 per share. The transaction took place on March 16, 2026 and is classified as a direct disposition.

After the sale, D’Ambrosio directly holds 8,912.23 ADP shares, indicating he retained a substantial equity stake. The filing notes the trade was executed under a Rule 10b5-1 trading plan adopted in September 2025, suggesting the sale was pre-scheduled rather than opportunistic.

Insider Trade Summary 10b5-1

Net Seller: 543 shares

Net Sell 1 txn

Insider D'Ambrosio Christopher

Role Corp. VP

Sold 543 shs ($113K)

Type	Security	Shares	Price	Value
Sale	Common Stock	543	$208.45	$113K

Holdings After Transaction: Common Stock — 8,912.23 shares (Direct)

Footnotes (1)

1. F1. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ADP executive Christopher D’Ambrosio report?

Christopher D’Ambrosio reported an open-market sale of ADP shares. On March 16, 2026, he sold 543 shares of Automatic Data Processing Common Stock as a direct transaction, according to the Form 4 insider filing.

How many ADP shares did Christopher D’Ambrosio sell and at what price?

D’Ambrosio sold 543 ADP Common Stock shares at a price of $208.45 per share. This was an open-market sale reported as a non-derivative transaction in the Form 4 filing.

How many ADP shares does Christopher D’Ambrosio hold after this sale?

Following the transaction, D’Ambrosio directly holds 8,912.23 ADP shares. This post-transaction balance in the Form 4 shows he continues to maintain a significant direct ownership position in Automatic Data Processing.

Was the ADP insider sale by Christopher D’Ambrosio under a Rule 10b5-1 plan?

Yes. A footnote states the reported transactions were effected under a Rule 10b5-1 trading plan adopted by D’Ambrosio in September 2025. Such plans pre-schedule trades, reducing the significance of short-term market timing.

Does the Form 4 for ADP show any option exercises or derivative transactions?

No derivative activity is listed in this Form 4 excerpt. The filing shows one non-derivative open-market sale of Common Stock and a derivativeSummary section with no remaining derivative positions disclosed in this particular filing.

Is Christopher D’Ambrosio a major ADP shareholder based on this Form 4?

The Form 4 identifies D’Ambrosio as a corporate vice president, not a ten percent owner. It reports his direct holdings of 8,912.23 ADP shares after the sale, but does not indicate he meets the ten percent ownership threshold.

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

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Accepted by SEC EDGAR 03/17/2026 - 04:21 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

D'Ambrosio Christopher

(Last) (First) (Middle)

ONE ADP BOULEVARD

(Street)

ROSELAND NJ 07068

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AUTOMATIC DATA PROCESSING INC [ ADP ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Corp. VP

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/16/2026		S		543(1)	D	$208.45	8,912.23	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person in September 2025.

	David Kwon (POA on File)	03/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.