[Form 4] Automatic Data Processing Insider Trading Activity

Rhea-AI Filing Summary

Michael A. Bonarti, Corporate Vice President at Automatic Data Processing (ADP), reported a sale of 8,728 shares of ADP common stock on 09/09/2025 at a price of $298.43 per share. The Form 4 states the sale was executed under a Rule 10b5-1 trading plan adopted by Mr. Bonarti in September 2024. After the reported transaction, the filing shows beneficial ownership of 80,531.432 shares. The Form 4 is filed individually by the reporting person and was signed by a power of attorney, David Kwon, on 09/11/2025.

Positive

• Transaction executed under a Rule 10b5-1 trading plan, indicating preplanned compliance with insider trading rules
• Timely and specific disclosure of shares sold (8,728) and sale price ($298.43), with post-transaction beneficial ownership reported
• Clear identification of reporting person and role (Corporate Vice President), aiding transparency

Negative

• Insider sale of 8,728 shares may be viewed negatively by some investors despite being under a 10b5-1 plan
• Filing shows reduced ownership (post-transaction 80,531.432 shares), which could be interpreted as decreased insider stake

Insights

Financial Analyst

TL;DR: Officer sale of 8,728 ADP shares executed under a 10b5-1 plan; disclosure is routine and provides limited new information.

The sale is explicitly tied to a Rule 10b5-1 plan adopted in September 2024, which typically indicates preplanned, preapproved trading to avoid contemporaneous insider trading concerns. The transaction size is specified as 8,728 shares at $298.43 each, and the filer reports post-transaction beneficial ownership of 80,531.432 shares. There are no derivative transactions or additional compensatory grants reported on this Form 4. From a market-impact perspective, the filing supplies precise execution details but does not present material corporate news or changes to compensation or control.

Corporate Governance Expert

TL;DR: Disclosure complies with Section 16 reporting; sale under a 10b5-1 plan reduces governance risk around timing.

The Form 4 identifies the reporting person as an officer (Corporate Vice President) and documents a sale under an established 10b5-1 plan, which strengthens the appearance of compliance with insider trading rules. The report is filed individually and executed via a power of attorney, with a clear explanation that the transactions were effectuated pursuant to the trading plan. The filing does not indicate any amendments, derivative activity, or changes in officer status, so governance implications are limited to routine insider liquidity.

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^*

Bonarti Michael A

(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)
	Corporate Vice President

3. Date of Earliest Transaction (Month/Day/Year)
09/09/2025

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	09/09/2025		S		8,728(1)	D	$298.43	80,531.432	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 insider transaction did ADP (ADP) report on this Form 4?

The Form 4 discloses that Michael A. Bonarti sold 8,728 shares of ADP common stock on 09/09/2025 at a price of $298.43 per share.

Was the sale by Michael Bonarti conducted under a trading 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 does Michael Bonarti beneficially own after the reported sale?

The Form 4 reports post-transaction beneficial ownership of 80,531.432 shares.

What is Michael Bonarti's role at ADP as stated on the filing?

The filing identifies Michael A. Bonarti as a Corporate Vice President of Automatic Data Processing, Inc.

Who signed the Form 4 and when was it signed?

The Form 4 was signed by David Kwon (POA on file) on 09/11/2025.