Aon (NYSE: AON) director gets annual stock grant with tax withholding

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Aon plc director Adriana Karaboutis reported routine equity compensation activity. She received an award of 776 Class A Ordinary Shares as part of the annual grant to non-employee directors, agreeing under Irish law to pay the nominal value of US $0.01 per share.

The company withheld 186.235 Class A Ordinary Shares to cover related tax obligations, a non-market, tax-withholding disposition. Following these transactions, Karaboutis directly holds 2,791.970 Class A Ordinary Shares of Aon plc.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Karaboutis Adriana

Role null

Type	Security	Shares	Price	Value
Grant/Award	Class A Ordinary Stock	776	$0.00	--
Tax Withholding	Class A Ordinary Stock	186.235	$315.95	$59K

Holdings After Transaction: Class A Ordinary Stock — 2,791.97 shares (Direct, null)

Footnotes (1)

Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person. Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

Key Figures

Director share grant: 776 shares Shares withheld for taxes: 186.235 shares Post-transaction holdings: 2,791.970 shares +2 more

5 metrics

Director share grant 776 shares Annual Class A Ordinary Shares grant to non-employee director

Shares withheld for taxes 186.235 shares Class A Ordinary Shares withheld by issuer for tax obligations

Post-transaction holdings 2,791.970 shares Class A Ordinary Shares directly held after transactions

Tax-withholding price $315.95 per share Price per share for tax-withholding disposition on Class A shares

Nominal value per share $0.01 per share Nominal value paid under Irish law for granted shares

Key Terms

Class A Ordinary Stock, tax-withholding disposition, grant/award acquisition, nominal value

4 terms

Class A Ordinary Stock financial

"security_title: "Class A Ordinary Stock" for both transactions"

tax-withholding disposition financial

"transaction_action: "tax-withholding disposition" for the F-code entry"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

grant/award acquisition financial

"transaction_action: "grant/award acquisition" for the A-code entry"

nominal value financial

"agreed to pay the issuer the nominal value of US $0.01 per share"

Nominal value is the stated or face amount assigned to a financial instrument — for shares it’s the par value printed on the stock certificate, and for money or returns it can mean the number not adjusted for inflation. Think of it like a price tag on an item versus its buying power: the tag tells you the label, but not how much you can actually buy. Investors care because nominal values affect accounting, legal capital, dividend calculations and comparisons over time when inflation may distort real worth.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/29/2026 - 05:16 PM Accepted by SEC EDGAR 06/29/2026 - 05:16 PM

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Karaboutis Adriana

(Last)

(First)

(Middle)

200 EAST RANDOLPH ST.

(Street)

CHICAGO

ILLINOIS

60601

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Aon plc [ AON ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Ordinary Stock	06/25/2026		A⁽¹⁾		776	A	⁽¹⁾	2,791.97	D
Class A Ordinary Stock	06/25/2026		F⁽²⁾		186.235	D	$315.95	2,605.735	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Class A Ordinary Shares granted annually to each non-employee director of Aon plc. In accordance with Irish law, reporting person agreed to pay the issuer the nominal value of US $0.01 per share issued to the reporting person.

2. Class A Ordinary Shares withheld by the issuer for payment of taxes in connection with the award.

	/s/ Colby Alexis - Colby Alexis pursuant to a power of attorney from Adriana Karaboutis	06/29/2026
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Adriana Karaboutis report at Aon (AON)?

Adriana Karaboutis reported a routine equity compensation event at Aon. She received 776 Class A Ordinary Shares as a director grant, and 186.235 shares were withheld by the company to satisfy tax obligations, leaving her with 2,791.970 shares directly held.

How many Aon (AON) shares were granted to Adriana Karaboutis?

Adriana Karaboutis was granted 776 Class A Ordinary Shares of Aon. The filing notes this as an annual share grant to non-employee directors, with a nominal value of US $0.01 per share in accordance with Irish law governing the share issuance.

Why were some of Adriana Karaboutis’s Aon (AON) shares disposed of?

A total of 186.235 Aon Class A Ordinary Shares were withheld for taxes. The filing classifies this as a tax-withholding disposition, where the issuer withholds shares to cover tax liabilities tied to the equity award, rather than a discretionary open-market sale.

What is Adriana Karaboutis’s Aon (AON) shareholding after these transactions?

After the reported grant and tax withholding, Adriana Karaboutis directly holds 2,791.970 Aon Class A Ordinary Shares. This figure reflects her updated ownership position following the award of 776 shares and the withholding of 186.235 shares for tax obligations.

Was the Aon (AON) insider transaction an open-market buy or sell?

The activity was not an open-market trade. It consisted of an equity award of 776 shares to a non-employee director and a related tax-withholding disposition of 186.235 shares by the issuer, a standard mechanism for covering tax liabilities on stock-based compensation.