AON: Financial results

Item 2.02. Results of Operations and Financial Condition. On October 28, 2026, Aon plc issued a press release (the “Press Release”) announcing its results of operations for the quarter ended September 30, 2026. A copy of the Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Item 9.01. Financial Statements and Exhibits. (a) - (c) Not applicable. (d) Exhibits: Exhibit Number Description of Exhibit 99.1 Press Release issued by Aon plc on October 28, 2026. 104 Cover Page Interactive Data File (formatted as Inline XBRL) 3 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/ David DeBrunner David DeBrunner Senior Vice President, Global Controller and Chief Accounting Officer Date: October 28, 2026 4