Aon COO Mindy Simon updates ownership after RSU vest and tax withholding

Rhea-AI Filing Summary

Aon plc (AON) Chief Operating Officer Mindy Simon reported the vesting of a restricted share unit award on November 14, 2025. The award converted 1,970 restricted share units into Class A ordinary shares on a 1-for-1 basis. Of these shares, 606.213 Class A ordinary shares were withheld by Aon to cover taxes at a price of $350.13 per share. Following these transactions, Simon directly beneficially owns 3,179.421 Class A ordinary shares. The original restricted share unit grant, made on November 15, 2022 under the Aon plc 2011 Incentive Compensation Plan, vests in three equal annual installments.

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^*

Simon Mindy F.

(Last) (First) (Middle)

200 EAST RANDOLPH ST.

(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 Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/14/2025

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	11/14/2025		M(1)		1,970	A	(1)	3,785.634	D
Class A Ordinary Stock	11/14/2025		F(2)		606.213	D	$350.13	3,179.421	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)	11/14/2025		M			1,970	(4)	11/15/2025(4)	Class A Ordinary Shares	1,970	$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 US$0.01 per share issued to the reporting person.

4. A restricted share unit award was granted on November 15, 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 Mindy Simon	11/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What did Aon (AON) disclose in this Form 4 filing?

Aon disclosed that its Chief Operating Officer, Mindy Simon, had 1,970 restricted share units vest into Class A ordinary shares on November 14, 2025, with related tax withholding and an updated ownership position.

How many Aon (AON) shares vested for the COO in this transaction?

The filing shows that 1,970 restricted share units vested and converted into 1,970 Class A ordinary shares of Aon plc.

How many Aon (AON) shares were withheld to cover taxes and at what price?

Aon withheld 606.213 Class A ordinary shares to satisfy tax obligations associated with the vesting, at a price of $350.13 per share.

What is Mindy Simon’s direct Aon (AON) share ownership after the reported transactions?

After the vesting and tax withholding, Mindy Simon directly beneficially owns 3,179.421 Class A ordinary shares of Aon plc.

What are the terms of the Aon (AON) restricted share unit award referenced in the Form 4?

The restricted share unit award was granted on November 15, 2022 under the Aon plc 2011 Incentive Compensation Plan and vests as follows: 33 1/3% of the award vests on each of the first, second, and third anniversaries of the grant date.

How do the Aon (AON) restricted share units convert into shares?

The restricted share unit award converts to Aon Class A ordinary shares on a 1-for-1 basis, with the reporting person agreeing under Irish law to pay the nominal value of US$0.01 per share issued.