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): September 21, 2022

Aon plc

(Exact name of registrant as specified in its charter)

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

Former name or former address, if changed since last report: Not Applicable

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):

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

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 September 21, 2022, J. Michael Losh informed Aon plc (the “Company”) of his decision to retire from the Company’s Board of Directors, effective upon the completion of his current term at the time of the Company’s 2023 Annual General Meeting. Mr. Losh informed the Company that his retirement is not due to any disagreements with the Company on any matter relating to the Company’s operations, policies or practices. The Company thanks Mr. Losh for his many years of dedicated service to the Company and the Board of Directors, including 12 years as Chair of the Audit Committee. In recognizing Mr. Losh’s service and retirement, Lester Knight, Chair of the Company’s Board of Directors, said “Throughout Mike’s service to our Board over the past 20 years, we have greatly benefitted from his valuable perspectives and strategic advice on the business, risk management, compliance, and corporate governance. It has been an absolute privilege to serve alongside Mike, and we wish him the very best.”

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.