[Form 3] Aon plc Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Aon plc officer David J. DeBrunner submitted an Initial Statement of Beneficial Ownership (Form 3) reporting his relationship to the issuer as an officer with the title Principal Accounting Officer and as a director. The filing, covering the event date 09/15/2025, shows zero Class A ordinary shares beneficially owned (direct ownership reported as 0). The Form 3 was signed on behalf of Mr. DeBrunner by Colby Alexis under a power of attorney and dated 09/23/2025. No derivative securities or indirect ownership are disclosed in the filing.

Positive

• Initial disclosure filed for an officer, satisfying Section 16 reporting requirements
• Clear identification of role as Principal Accounting Officer and director

Negative

• No Class A ordinary shares reported as beneficially owned (direct ownership = 0)
• No derivative or indirect holdings disclosed, indicating no reported insider equity stake

Insights

Securities Compliance Analyst

TL;DR: Routine Form 3 filing by an officer reporting no direct Class A share ownership; procedural and compliance disclosure only.

This Form 3 documents an initial Section 16 filing for David J. DeBrunner identifying his roles as Principal Accounting Officer and director and reports zero direct ownership of Class A ordinary stock. There are no derivative positions or indirect holdings disclosed. The filing was executed under a power of attorney, which is a standard practice when officers use delegated signature authority. From a compliance standpoint the filing satisfies initial reporting requirements by disclosing relationship, event date, and signer information.

Corporate Governance Specialist

TL;DR: Disclosure is informational and non-material to valuation; it confirms officer status but shows no equity stake.

The document confirms Mr. DeBrunner's officer title and his reporting obligation under Section 16 with an initial Form 3. The absence of any reported shares or derivative positions means there is no immediate insider ownership to influence shareholder alignment or signal insider buying/selling. The power of attorney signature is properly noted, indicating administrative handling of filings rather than substantive transfer of rights.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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1. Name and Address of Reporting Person^*

DEBRUNNER DAVID J

(Last) (First) (Middle)

200 EAST RANDOLPH STREET

(Street)

CHICAGO IL 60601

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/15/2025

3. Issuer Name and Ticker or Trading Symbol
Aon plc [ AON ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Principal Accounting Officer

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Ordinary Stock	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from David DeBrunner	09/23/2025
	** 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 5 (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 the Form 3 filed for AON report about David J. DeBrunner's ownership?

The Form 3 reports zero Class A ordinary shares beneficially owned directly and discloses no derivative or indirect holdings.

What officer title is listed for the reporting person on the AON Form 3?

The filing lists David J. DeBrunner as an officer with the title Principal Accounting Officer and also indicates director status.

When is the event date and when was the Form 3 signed?

The event date is 09/15/2025 and the signature (by power of attorney) is dated 09/23/2025.

Who signed the Form 3 on behalf of David J. DeBrunner?

The Form 3 was signed by Colby Alexis pursuant to a power of attorney from David DeBrunner.

Does the Form 3 disclose any derivative securities for AON?

No. The filing shows no derivative securities beneficially owned by the reporting person.