Amendment to Employment Agreement, dated as of April 2, 2024, by and among Aon plc, Aon Corporation and Gregory C. Case

Exhibit 10.1

AMENDMENT TO EMPLOYMENT AGREEMENT

This Amendment to Employment Agreement (this “Amendment”), effective as of April 2, 2024, attaches to and forms part of that certain Amended and Restated Employment Agreement dated as of January 16, 2015, as amended on April 20, 2018, May 15, 2018, and July 26, 2021 (the “Agreement”), among Aon Corporation, a Delaware corporation (the “Company”), Aon plc, a public limited company organized under Irish law (the “Parent”), and Gregory C. Case (the “Executive”). Capitalized terms used and not defined herein shall have the meanings ascribed to such terms in the Agreement.

WHEREAS, the parties mutually desire to extend the Employment Period for two years as provided in this Amendment.

NOW THEREFORE, in consideration of the premises and the mutual agreements contained herein, the parties hereby agree as follows:

IN WITNESS WHEREOF, the parties hereto have executed this Amendment to the Agreement as of the date set forth above.