Gregory C. Case - 17 Feb 2026 Form 4 Insider Report for Aon plc (AON)

Role: President & CEO, Director
Signature: /s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Greg Case
Issuer symbol: AON
Transactions as of: 17 Feb 2026
Net transactions value: -$326,513
Form type: 4
Filing time: 19 Feb 2026, 17:01:04 UTC
Previous filing: 17 Feb 2026
Next filing: 20 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Case Gregory C	President & CEO, Director	200 EAST RANDOLPH ST., CHICAGO	/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Greg Case	19 Feb 2026	0001322803

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AON	Class A Ordinary Stock	Options Exercise		+2,357	+0.25%		941,139	17 Feb 2026	Direct	F1
transaction	AON	Class A Ordinary Stock	Tax liability	$326,513	-1,002	-0.11%	$325.96	940,137	17 Feb 2026	Direct	F2
transaction	AON	Class A Ordinary Stock	Gift	$0	-3,214	-0.34%	$0.000000	936,923	17 Feb 2026	Direct
transaction	AON	Class A Ordinary Stock	Gift	$0	-3,214	-0.34%	$0.000000	933,709	17 Feb 2026	Direct
transaction	AON	Class A Ordinary Stock	Gift	$0	+3,214	+2.5%	$0.000000	132,243	17 Feb 2026	By Trust
transaction	AON	Class A Ordinary Stock	Gift	$0	+3,214	+2.5%	$0.000000	132,243	17 Feb 2026	By Trust
holding	AON	Class A Ordinary Stock						163,964	17 Feb 2026	By Trust
holding	AON	Class A Ordinary Stock						163,963	17 Feb 2026	By Trust
holding	AON	Class A Ordinary Stock						37,412	17 Feb 2026	By GRAT
holding	AON	Class A Ordinary Stock						73,240	17 Feb 2026	By GRAT

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	-2,357	-100%	$0.000000	0	17 Feb 2026	Class A Ordinary Shares	2,357		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 withholding 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 February 17, 2023 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.