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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): August 1, 2025

Aon plc

(Exact Name of Registrant as Specified in 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.

On August 1, 2025, the Board of Directors (the “Board”) of Aon plc (the “Company”) increased the size of the Board to thirteen members and appointed Jo Ann Jenkins as a director of the Company, effective August 15, 2025. Ms. Jenkins will serve until the Company’s 2026 annual general meeting of shareholders, when she is expected to be subject to re-election by a vote of the Company’s shareholders. The Board has appointed Ms. Jenkins to the Audit Committee of the Board, also effective August 15, 2025. The Board determined that Ms. Jenkins is independent as defined by the listing standards of the New York Stock Exchange and under the Company’s independence standards, as well as Rule 10A-3 under the Securities and Exchange Act of 1934.

Ms. Jenkins most recently served as the Chief Executive Officer of AARP, a nonprofit, nonpartisan membership organization dedicated to issues affecting Americans over 50, a position she held from 2014 until her retirement from the role in 2024. Prior to her appointment as CEO, Ms. Jenkins served as AARP’s Chief Operating Officer, and before that as president of AARP Foundation. Before joining AARP, Ms. Jenkins served at the Library of Congress as Chief Operating Officer and Chief of Staff. She has also held a variety of senior roles at the U.S. Department of Agriculture, the U.S. Department of Transportation, and the U.S. Department of Housing and Urban Development. Ms. Jenkins serves on the board of directors of General Mills, Inc., a multinational food company, and Avnet, Inc., an electronic components distributor.

Ms. Jenkins will receive compensation as a non-management director in accordance with the Company’s compensation practices for non-management directors (prorated based on her start date), which are generally described in the Company’s Proxy Statement for the Company’s 2025 annual general meeting of shareholders filed with the U.S. Securities and Exchange Commission on April 28, 2025. In addition, the Company will enter into its standard deed of indemnity for directors of the Company with Ms. Jenkins.

There is no arrangement between Ms. Jenkins and any other person pursuant to which she was selected as a director. Ms. Jenkins has not engaged in any transaction with the Company that would be reportable as a related person transaction under Item 404(a) of Regulation S-K.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


Aon plc

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

Date: August 4, 2025

Aon plc 8-K