[Form 4] Automatic Data Processing Insider Trading Activity

Rhea-AI Filing Summary

Christopher D'Ambrosio, Corporate Vice President at Automatic Data Processing, sold 597 shares of ADP common stock on 09/10/2025 at a reported price of $296.9 per share. After the sale, the Form 4 reports the reporting person beneficially owned 10,541.23 shares. The filing indicates the transactions were executed under a Rule 10b5-1 trading plan adopted in September 2024. The Form 4 was signed by a power of attorney, David Kwon, on 09/11/2025.

Positive

• Transaction executed under a Rule 10b5-1 trading plan, indicating a pre-specified, programmatic sale
• Timely disclosure via Form 4 with transaction date and price disclosed

Negative

• Reduction in insider holdings by 597 shares which modestly lowers the reporting person’s stake

Insights

Financial Analyst

Routine insider sale under a 10b5-1 plan; likely immaterial to ADP's fundamentals.

The Form 4 documents a single non-derivative sale of 597 ADP shares at $296.9 per share, leaving 10,541.23 shares beneficially owned. The transaction is explicitly tied to a Rule 10b5-1 trading plan adopted in September 2024, which reduces the likelihood that this sale reflects undisclosed material information. For investors, this appears as a standard executive liquidity event rather than a signal of company-level change.

Corporate Governance Expert

Disclosure follows governance best practices by documenting a planned sale under an established 10b5-1 plan.

The filing clearly states the use of a 10b5-1 plan and provides transaction specifics: date, share count, and price. The use of a power of attorney for signature is disclosed. From a governance perspective, timely Form 4 reporting and the plan disclosure align with accepted insider trading controls and regulatory transparency.

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)
09/10/2025

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	09/10/2025		S		597(1)	D	$296.9	10,541.23	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 2024.

	David Kwon (POA on File)	09/11/2025
	** 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.

FAQ

What did Christopher D'Ambrosio report on the ADP Form 4?

The Form 4 reports a sale of 597 shares of ADP common stock on 09/10/2025 at a reported price of $296.9 per share.

Was the ADP insider transaction part of a pre-arranged plan?

Yes. The filing states the transactions were effected pursuant to a Rule 10b5-1 trading plan adopted in September 2024.

How many ADP shares did the reporting person own after the sale?

The Form 4 shows 10,541.23 shares beneficially owned following the reported transaction.

Who signed the Form 4 for Christopher D'Ambrosio?

The Form 4 was signed by David Kwon (power of attorney) on 09/11/2025.

Does this Form 4 indicate any derivative transactions or option exercises?

No. The filing lists a non-derivative common stock sale and contains no derivative securities transactions.