Edmund Reese - 12 Feb 2026 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: 12 Feb 2026
Net transactions value: -$80,684
Form type: 4
Filing time: 17 Feb 2026, 17:15:28 UTC
Previous filing: 03 Jul 2025
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	17 Feb 2026	0001833903

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AON	Class A Ordinary Stock	Options Exercise		+598	+34%		2,375	13 Feb 2026	Direct	F1
transaction	AON	Class A Ordinary Stock	Tax liability	$80,684	-251	-11%	$321.70	2,124	13 Feb 2026	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)	Award	$0	+2,337		$0.000000	2,337	12 Feb 2026	Class A Ordinary Shares	2,337		Direct	F3, F4
transaction	AON	Restricted Share Unit (Right to Receive)	Options Exercise	$0	-598	-33%	$0.000000	1,196	13 Feb 2026	Class A Ordinary Shares	598		Direct	F3, F5

* 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	The restricted share unit award vests in accordance with the terms of the Aon plc 2011 Incentive Compensation Plan, as amended and restated, as follows: 33 1/3% of the award vests on each of the first through third anniversary of the date of the grant.
F5	A restricted share unit award was granted on February 13, 2025 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.