Edmund Reese - 01 Jul 2025 Form 4 Insider Report for Aon plc (AON)

Role: Chief Financial Officer
Signature: /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Edmund Reese
Issuer symbol: AON
Transactions as of: 01 Jul 2025
Net transactions value: -$784,573
Form type: 4
Filing time: 03 Jul 2025, 16:05:39 UTC
Previous filing: 18 Feb 2025
Next filing: 17 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Reese Edmund	Chief Financial Officer	200 E. RANDOLPH ST., CHICAGO	/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Edmund Reese	03 Jul 2025	0001833903

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AON	Class A Ordinary Stock	Options Exercise		+3,975			3,975	01 Jul 2025	Direct	F1
transaction	AON	Class A Ordinary Stock	Tax liability	$784,573	-2,198	-55%	$356.93	1,777	01 Jul 2025	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AON	Restricted Share Unit (Right to Receive)	Options Exercise	$0	-3,975	-33%	$0.000000	7,950	01 Jul 2025	Class A Ordinary Shares	3,975		Direct	F3, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Class A Ordinary Shares acquired upon the vesting of a restricted share unit award.
F2	Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the vesting of the award.
F3	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.
F4	A restricted share unit award was granted on July 1, 2024 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.