[Form 4] Aon plc Insider Trading Activity

Rhea-AI Filing Summary

Aon plc Chief Commercial Officer Anne Corona reported routine equity compensation activity. On 11/21/2025, a restricted share unit award converted into 132 Class A Ordinary Shares upon vesting. These shares were issued under the Aon plc 2011 Incentive Compensation Plan, with the award originally granted on November 21, 2022 and vesting in three equal annual installments.

To cover taxes owed at vesting, 65.444 Class A Ordinary Shares were withheld by Aon at a price of $346.51 per share. After these transactions, Anne Corona beneficially owned 2,224.077 Class A Ordinary Shares directly. The restricted share units converted to shares on a 1-for-1 basis, with the reporting person agreeing to pay the nominal value of $0.01 per share in line with Irish law.

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

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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^*

Corona Anne

(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)
	Chief Commercial Officer

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)		132	A	(1)	2,289.521	D
Class A Ordinary Stock	11/21/2025		F(2)		65.444	D	$346.51	2,224.077	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			132	11/21/2025(4)	11/21/2025(4)	Class A Ordinary Shares	132	$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 Anne Corona	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 (AON) report for Anne Corona?

Aon reported that Chief Commercial Officer Anne Corona had a restricted share unit award vest into 132 Class A Ordinary Shares on 11/21/2025.

How many Aon (AON) shares were withheld to cover taxes?

Aon withheld 65.444 Class A Ordinary Shares from Anne Corona at a price of $346.51 per share to pay taxes related to the vesting.

How many Aon (AON) shares does Anne Corona own after the reported transaction?

Following the reported transactions, Anne Corona beneficially owned 2,224.077 Class A Ordinary Shares of Aon plc directly.

What was the original grant date and vesting schedule of the Aon restricted share units?

The restricted share unit award was granted on November 21, 2022, with 33 1/3% of the award vesting on each of the first through third anniversaries of the grant date.

What is the conversion ratio of Aon (AON) restricted share units to shares?

The filing states that the restricted share unit award converts to Class A Ordinary Shares on a 1-for-1 basis.

What nominal value does Anne Corona pay for Aon shares issued from RSUs?

In accordance with Irish law, Anne Corona agreed to pay Aon plc the nominal value of $0.01 per share for Class A Ordinary Shares issued upon RSU vesting.