Reg FD Disclosure

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): May 12, 2021     Aon plc (Exact name of registrant as specified in its charter)       Ireland   1-7933   98-1539969 (State or other jurisdiction of incorporation)   (Commission File Number)   (IRS Employer Identification No.) Metropolitan Building , James Joyce Street        Dublin 1 , Ireland D01 K0Y8 5 (Address of principal executive offices) 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):   ☐ 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 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 4.000% Senior Notes due 2023   AON23   New York Stock Exchange Guarantees of Aon plc’s 3.500% Senior Notes due 2024   AON24   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 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 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 7.01 Regulation FD Disclosure. On May 12, 2021, in connection with the pending combination of Aon plc (“Aon”) and Willis Towers Watson Public Limited Company (“WTW”), Aon and WTW issued a joint press release announcing the execution of a definitive agreement to sell Willis Re and a set of WTW corporate risk and broking and health and benefits services to Arthur J. Gallagher & Co. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information in this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “U.S. Exchange Act”), nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended (the “U.S. Securities Act”), except as shall be expressly set forth by specific reference in such a filing.   Item 9.01 Financial Statements and Exhibits (d)    Exhibits:   Exhibit Number    Description of Exhibit 99.1    Joint press release issued by Aon and WTW on May 12, 2021. 104    Cover Page Interactive Data File (embedded within the Inline XBRL document) 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.   Date: May 12, 2021     AON PLC     By:   /s/ Julie E. Cho       Julie E. Cho       Assistant Company Secretary