8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 27, 2025

Aon plc

(Exact name of registrant as specified in its charter)

Ireland

1-7933

98-1539969

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)


15 George’s Quay, Dublin 2, Ireland D02 VR98
(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: +353 1 266 6000

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A Ordinary Shares $0.01 nominal value	AON	New York Stock Exchange
Guarantees of Aon plc’s 3.875% Senior Notes due 2025	AON25	New York Stock Exchange
Guarantees of Aon plc’s 2.875% Senior Notes due 2026	AON26	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.85% Senior Notes due 2027	AON27	New York Stock Exchange
Guarantees of Aon North America, Inc.’s 5.125% Senior Notes due 2027	AON27B	New York Stock Exchange
Guarantees of Aon North America, Inc.’s 5.150% Senior Notes due 2029	AON29	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.05% Senior Notes due 2031	AON31	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.60% Senior Notes due 2031	AON31A	New York Stock Exchange
Guarantees of Aon North America, Inc.’s 5.300% Senior Notes due 2031	AON31B	New York Stock Exchange
Guarantee of Aon Corporation and Aon Global Holdings plc’s 5.00% Senior Notes due 2032	AON32	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.35% Senior Notes due 2033	AON33	New York Stock Exchange
Guarantees of Aon North America, Inc.’s 5.450% Senior Notes due 2034	AON34	New York Stock Exchange
Guarantees of Aon plc’s 4.250% Senior Notes due 2042	AON42	New York Stock Exchange
Guarantees of Aon plc’s 4.45% Senior Notes due 2043	AON43	New York Stock Exchange
Guarantees of Aon plc’s 4.600% Senior Notes due 2044	AON44	New York Stock Exchange
Guarantees of Aon plc’s 4.750% Senior Notes due 2045	AON45	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.90% Senior Notes due 2051	AON51	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.90% Senior Notes due 2052	AON52	New York Stock Exchange
Guarantees of Aon North America, Inc.’s 5.750% Senior Notes due 2054	AON54	New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Amendment to International Assignment Letter

On June 27, 2025, Aon Corporation (“Aon Corporation”), an indirect, wholly owned subsidiary of Aon plc (together with its subsidiaries, “Aon” or the “Company”), and Gregory C. Case entered into an amendment (the “Case Amendment”) to the international assignment letter agreement dated July 1, 2016 between Aon Corporation and Mr. Case (as amended, the “Case International Assignment Letter”). The Case Amendment extends the term of the Case International Assignment Letter, which was set to expire on June 30, 2025, to expire on June 30, 2026.

Amendment and Restatement of Aon plc 2011 Incentive Plan

On June 27, 2025, the Company held its 2025 Annual General Meeting of Shareholders (the “Annual Meeting”) at which the Company’s shareholders approved the Aon plc 2011 Incentive Plan, as amended and restated (the “Amended Plan”). The Amended Plan increases by 3,800,000 the maximum number of Class A Ordinary Shares available for issuance thereunder. The Amended Plan also mandates a minimum vesting period of at least one year for all equity awards granted thereunder (subject to certain exceptions described in the Amended Plan).

Further information regarding the Amended Plan was provided in the Company’s definitive proxy statement for the Annual Meeting filed with the Securities and Exchange Commission on April 28, 2025 (the “Proxy Statement”) in the section entitled “Proposal 8–Resolution to Approve the Aon plc 2011 Incentive Plan, As Amended and Restated”.

The foregoing summaries are qualified in their entirety by reference to the Case Amendment and the Amended Plan, copies of which are attached as Exhibits 10.1 and 10.2, respectively, to this Current Report on Form 8-K and incorporated herein by reference.

Item 5.07

Submission of Matters to a Vote of Security Holders.

The Company held its Annual Meeting on June 27, 2025. A total of 193,925,428 Class A Ordinary Shares, or 89.77% of the total shares entitled to vote, were represented at the Annual Meeting in person or by proxy.

Shareholders voted on the following eight proposals at the Annual Meeting, all of which are described in the Proxy Statement, and cast their votes as described below:

1.	The election of 12 nominees to serve as directors. All of the nominees were elected.


Nominee	For		Against		Abstain		Broker Non-Votes
Lester B. Knight		162,843,530		13,470,235		73,858		17,537,805
Gregory C. Case		175,184,226		1,149,339		54,058		17,537,805
Jose Antonio Álvarez		174,838,572		1,439,070		109,981		17,537,805
Jin-Yong Cai		173,844,128		2,468,438		75,057		17,537,805
Jeffrey C. Campbell		173,217,255		3,092,404		77,964		17,537,805
Cheryl A. Francis		167,846,227		8,343,311		198,085		17,537,805
Adriana Karaboutis		173,240,752		2,909,392		237,479		17,537,805
Richard C. Notebaert		163,198,345		13,119,735		69,543		17,537,805
Gloria Santona		165,532,594		10,650,336		204,693		17,537,805
Sarah E. Smith		175,835,501		451,004		101,118		17,537,805
Byron O. Spruell		173,926,837		2,381,609		79,177		17,537,805
James G. Stavridis		174,829,272		1,447,820		110,531		17,537,805

2.	An advisory vote to approve executive compensation. This advisory resolution was approved.


For	Against	Abstain	Broker Non-Votes
156,384,747	19,184,418	818,458	17,537,805

3.	The ratification of the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2025. This ordinary resolution was approved.


For	Against	Abstain
178,288,894	15,556,606	79,928

4.	The re-appointment of Ernst & Young Chartered Accountants as the Company’s statutory auditor under Irish law to hold office from the conclusion of the Annual Meeting until the conclusion of the next annual general meeting of shareholders. This ordinary resolution was approved.


For	Against	Abstain
180,464,792	13,381,669	78,967

5.	The authorization of the Company’s Board of Directors or the Audit Committee of the Company’s Board of Directors to determine the remuneration of Ernst & Young Chartered Accountants as the Company’s statutory auditor. This ordinary resolution was approved.


For	Against	Abstain
189,384,152	4,443,078	98,198

6.	The authorization of the Company’s Board of Directors to issue Class A Ordinary Shares under Irish law for a period expiring on the date which is 18 months from the date of the Annual Meeting. This ordinary resolution was approved.


For	Against	Abstain
190,304,720	3,461,218	159,490

7.	The authorization of the Company’s Board of Directors to opt-out of statutory pre-emption rights under Irish law for a period expiring on the date which is 18 months from the date of the Annual Meeting. This special resolution was approved.


For	Against	Abstain
181,996,483	11,798,943	130,002

8.	The approval of the Aon plc 2011 Incentive Plan, as amended and restated. This ordinary resolution was approved.


For	Against	Abstain	Broker Non-Votes
172,057,917	4,232,018	97,688	17,537,805

* * * *


Exhibit Number		Description of Exhibit

10.1		Amendment to International Assignment Letter, dated June 27, 2025, between Aon Corporation and Greg Case.

10.2		Aon plc 2011 Incentive Plan, as Amended and Restated.

104		Cover Page Interactive Data File (embedded within the Inline XBRL document).


Aon plc

By:		/s/ Darren Zeidel
Name:		Darren Zeidel
Title:		Executive Vice President, General Counsel and Company Secretary