Management Change/Compensation Form 8 K

On August 5, 2024, the Board of Directors (the "Board") of Aon plc (the "Company") increased the size of the Board to 13 members and appointed James Stavridis as a director of the Company, effective August 15, 2024. Admiral Stavridis will serve until the Company's 2025 annual general meeting of shareholders, when he is expected to be subject to re-electionby a vote of the Company's shareholders. The Board has appointed Admiral Stavridis to the Finance Committee of the Board, also effective August 15, 2024.

Admiral Stavridis is currently Partner and Vice Chair, Global Affairs of Carlyle, a global investment firm, a position he has held since 2018. Admiral Stavridis is a former member of the United States Navy, serving from 1976 to 2013 and rising to the rank of 4-starAdmiral in 2009. His commands included four years as the 16th Supreme Allied Commander at NATO, where he oversaw operations in Afghanistan, Libya, Syria, the Balkans, and counter piracy off the coast of Africa, as well as approximately three years commanding the U.S. Southern Command in Miami, charged with military operations throughout Latin America. Following his military career, he served as dean of The Fletcher School of Law and Diplomacy at Tufts University from 2013 to 2018. Admiral Stavridis previously served as a board member of American Water Works Company, Inc., a publicly traded water utility company, and as a director of the Neuberger Berman Funds. Admiral Stavridis serves on the board of directors of Fortinet, Inc., a cybersecurity company, and as a director of several private companies and non-profit organizations.

Admiral Stavridis will receive compensation as a non-managementdirector in accordance with the Company's compensation practices for non-managementdirectors (prorated based on his start date), which are generally described in the Company's Proxy Statement for the Company's 2024 annual general meeting of shareholders, filed with the U.S. Securities and Exchange Commission (the "SEC") on April 29, 2024. In addition, the Company will enter into its standard deed of indemnity for directors of the Company with Admiral Stavridis.

There is no arrangement between Admiral Stavridis and any other person pursuant to which he was selected as a director. In satisfaction of the disclosure required by Item 404(a) of Regulation S-K,the disclosure under Item 1.01 of the Company's Current Report on Form 8-Kfiled with the SEC on December 20, 2023, regarding the Company's acquisition of NFP, which disclosure is incorporated herein by reference. In connection with the Company's acquisition of NFP for an enterprise value of $13.0 billion and in consideration for his ownership of equity interests in NFP, Admiral Stavridis and his family trust were collectively issued 4,809 class A ordinary shares of the Company and $74,189.