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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): September 3, 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 Exchange 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 2.850% 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 2.050% Senior Notes due 2031	AON31	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 2.600% 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
Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.000% Senior Notes due 2032	AON32	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 5.350% 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 4.450% 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 2.900% Senior Notes due 2051	AON51	New York Stock Exchange
Guarantees of Aon Corporation and Aon Global Holdings plc’s 3.900% 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-2of 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 7.01.

Regulation FD Disclosure.

On September 3, 2025, Aon plc (the “Company”) and Madison Dearborn Partners (“MDP”) issued a joint press release announcing the execution of a definitive agreement pursuant to which the Company has agreed to sell a significant majority of the wealth businesses of its indirect subsidiary, NFP Corp. (“NFP”) – Wealthspire Advisors, Fiducient Advisors, Newport Private Wealth and related platforms – to MDP for a total consideration estimated to be $2.7 billion at the time of transaction close, resulting in total after-tax cash proceeds of approximately $2.2 billion. The transaction is expected to close in late Q4 2025, subject to the satisfaction of customary closing conditions, including receipt of regulatory approvals.

A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information in this Item 7.01, including Exhibit 99.1, is being “furnished” and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01.

Financial Statements and Exhibits.

(d)

Exhibits


99.1		Press Release, dated September 3, 2025.

104		Cover Page Interactive Data File (formatted as inline XBRL).

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: September 3, 2025

Aon plc 8-K