[Form 4] Aon plc Insider Trading Activity

Rhea-AI Filing Summary

Aon plc reported a routine equity compensation transaction by its Global CEO, Solution Lines. On 11/21/2025, the executive acquired 86 Class A Ordinary Shares through the vesting of a restricted share unit award and simultaneously had 41.881 shares withheld by the company to cover taxes at a price of $346.51 per share. After these transactions, the executive directly beneficially owned 1,677.408 Class A Ordinary Shares. The underlying restricted share unit award had been granted in 2022 and vests in three equal annual installments under Aon’s 2011 Incentive Compensation Plan.

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

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

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^*

Marcell Andy

(Last) (First) (Middle)

200 EAST RANDOLPH STREET

(Street)

CHICAGO IL 60601

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Global CEO, Solution Lines

3. Date of Earliest Transaction (Month/Day/Year)
11/21/2025

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
Class A Ordinary Stock	11/21/2025		M(1)		86	A	(1)	1,719.289	D
Class A Ordinary Stock	11/21/2025		F(2)		41.881	D	$346.51	1,677.408	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
Restricted Share Unit (Right to Receive)	(3)	11/21/2025		M			86	(4)	11/21/2025(4)	Class A Ordinary Shares	86	$0	0	D

Explanation of Responses:

1. Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.

2. Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.

3. The restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis. In accordance with Irish law, the reporting person agreed to pay the issuer the nominal value of $0.01 per share issued to the reporting person.

4. A restricted share unit award was granted on November 21, 2022 and vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated: 33 1/3 of the award vests on each of the first through third anniversary of the date of grant.

	/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Andy Marcell	11/25/2025
	** 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.
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FAQ

What insider transaction did Aon plc (AON) report in this Form 4?

Aon plc reported that its Global CEO, Solution Lines acquired 86 Class A Ordinary Shares upon the vesting of a restricted share unit award and had 41.881 shares withheld to cover taxes.

What is the Aon (AON) executive’s share ownership after this transaction?

Following the reported transactions on 11/21/2025, the executive directly beneficially owned 1,677.408 Class A Ordinary Shares of Aon plc.

How were the Aon (AON) restricted share units converted to shares?

The restricted share unit award converted into Class A Ordinary Shares on a 1-for-1 basis, with the reporting person agreeing under Irish law to pay the issuer the nominal value of $0.01 per share issued.

Why were 41.881 Aon (AON) shares disposed of in this Form 4?

The 41.881 Class A Ordinary Shares were withheld by Aon plc for payment of taxes in connection with the vesting of the restricted share unit award, at a price of $346.51 per share.

When were the Aon (AON) restricted share units originally granted and how do they vest?

The restricted share unit award was granted on November 21, 2022 and vests under the Aon plc 2011 Incentive Compensation Plan in three equal installments of 33 1/3% on each of the first, second, and third anniversaries of the grant date.

Does this Aon (AON) Form 4 indicate any remaining derivative securities from this award?

No. After the vesting and conversion of 86 restricted share units into Class A Ordinary Shares, the number of derivative securities from this specific award was reported as 0.