Aon plc: Entry Into A Material Definitive Agreement, Termination Of A Material Definitive Agreement, Creation Of A Direct Financial Obligation Or An Obligation Under An, Financial Statements And Exhibits

Item 1.01 Entry into a Material Definitive Agreement Term Loan Credit Agreement On September 18, 2026, Aon plc, an Irish public limited company (the “Company”), Aon Corporation, a Delaware corporation (“Aon Corporation”), Aon Global Holdings plc, a public limited company organized under the laws of England and Wales (“AGH”), Aon Global Limited, a private limited company organized under the laws of England and Wales (“AGL”), and Aon North America, Inc., a Delaware corporation (“ANA”), entered into a Credit Agreement (the “Term Loan Credit Agreement”), with Citibank, N.A. (“Citibank”), as administrative agent, and the lenders party thereto from time to time (collectively, the “Term Lenders”), pursuant to which the Term Lenders committed to provide unsecured delayed draw term loan facilities in an aggregate principal amount of $4,000,000,000, consisting of (a) a two-year $2,000,000,000 term loan facility (the “Tranche 1 Term Loans”) and (b) a three-year $2,000,000,000 term loan facility (the “Tranche 2 Term Loans”, and together with the Tranche 1 Term Loans, the “Term Loans”). The Term Loans will be available, subject to customary limited conditionality for a financing transaction of this type, to ANA as borrower, on the closing date of the previously announced acquisition by ANA of USI Advantage Corp. (“USI” and such acquisition, the “USI Acquisition”) pursuant to the agreement and plan of merger, dated as of August 30, 2026 (the “Merger Agreement”), entered into by and among the Company, ANA, USI, Cortlandt Acquisition Corp., a Delaware corporation, and, solely in its capacity as the securityholder representative, Uno Aggregator II L.P., a Delaware limited partnership. The proceeds of the Term Loans will be used to pay a portion of the cash consideration with respect to the USI Acquisition and the other transactions contemplated by the Merger Agreement, and to pay fees and expenses in connection with the foregoing and the Term Loan Credit Agreement. Borrowings under the Term Loan Credit Agreement may be made by ANA in U.S. dollars and will bear interest at a base rate equal to, at ANA’s option, term SOFR or an alternate base rate plus, in each case, an applicable margin based on the Company’s senior unsecured long-term debt rating. The Tranche 1 Term Loans mature on September 18, 2028, the Tranche 2 Term Loans mature on September 18, 2029, and both tranches are prepayable at any time without penalty or premium. The Term Loan Credit Agreement contains financial covenants with respect to the ratio of consolidated adjusted EBITDA to consolidated interest expense (which may not be less than 4.00 to 1.00) and, following the consummation of the USI Acquisition, the ratio of consolidated funded net debt to consolidated adjusted EBITDA (which may not be more than 4.75 to 1.00, with multiple step-downs over an eight fiscal quarter period to 3.50 to 1.00, subject to certain exceptions and adjustments in connection with future acquisitions), as well as other customary covenants, undertakings and events of default for a financing transaction of this type. The foregoing description of the Term Loan Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Term Loan Credit Agreement, a copy of which is filed herewith as Exhibit 10.1 and incorporated herein by reference. Revolving Credit Agreement Also on September 18, 2026, Company, Aon Corporation, AGH, AGL, ANA and Aon UK Limited (“AUKL”) entered into a Credit Agreement (the “Revolving Credit Agreement”) with Citibank as administrative agent and the lenders party thereto from time to time (collectively, the “Revolving Lenders”), pursuant to which the Revolving Lenders committed to provide a $3,000,000,000 unsecured revolving credit facility. The Revolving Credit Agreement replaces (i) the $1,000,000,000 revolving credit facility of Company, Aon Corporation, AGH, AGL, AUKL and ANA, dated as of September 28, 2021, as amended, which was scheduled to mature on September 28, 2027 and (ii) the $1,000,000,000 revolving credit facility of Company, Aon Corporation, AGH, AGL and ANA, dated as of October 19, 2023, as amended, which was scheduled to mature on October 19, 2028. Borrowings under the Revolving Credit Agreement may be made by Aon Corporation, AGH, AGL, AUKL, ANA or any other subsidiary designated as a borrower in accordance with the Revolving Credit Agreement, subject to certain restrictions, in U.S. dollars, pounds sterling and euros; provided, that borrowings by AUKL may not exceed $1,000,000,000. Borrowings (i) in U.S. dollars will bear interest at a base rate equal to, at the borrower’s option, term SOFR rate or an alternate base rate plus, in each case, an applicable margin based on the Company’s senior unsecured long-term debt rating, (ii) in euros will bear interest at the eurocurrency rate plus a margin based on the Company’s senior unsecured long-term debt rating, and (iii) in pounds sterling will bear interest at SONIA plus a margin based on the Company’s senior unsecured long-term debt rating. The Revolving Credit Agreement has a maturity date of September 18, 2031, subject to optional one-year extensions, and contains financial covenants with respect to the ratio of consolidated adjusted EBITDA to consolidated interest expense (which may not be less than 4.00 to 1.00) and the ratio of consolidated funded net debt to consolidated adjusted EBITDA (which may not be more than, prior to the consummation of the USI Acquisition, 3.50 to 1.00, and, following the consummation of the USI Acquisition, 4.75 to 1.00, with multiple step-downs over an eight fiscal quarter period to 3.50 to 1.00, subject to certain exceptions and adjustments in connection with future acquisitions), as well as other customary covenants, undertakings and events of default for a financing transaction of this type. The Company and its subsidiaries have other commercial relationships with the Revolving Lenders, the Term Lenders, and the administrative agents, lead arrangers and syndication agents under the Term Loan Credit Agreement and the Revolving Credit Agreement, and/or their respective affiliates. In addition, the Company and certain of its affiliates have performed, and may perform, various insurance brokerage and consulting services for the Revolving Lenders, the Term Lenders, and the administrative agents, lead arrangers and syndication agents under the Term Loan Credit Agreement and the Revolving Credit Agreement, or their respective affiliates. The foregoing description of the Revolving Credit Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Revolving Credit Agreement, a copy of which is filed herewith as Exhibit 10.2 and incorporated herein by reference. Item 1.02 Termination of a Material Definitive Agreement. Prior 2021 Revolving Credit Agreement In connection with entering into the Revolving Credit Agreement, effective September 18, 2026, Company, Aon Corporation, AGH, AGL, AUKL and ANA terminated their $1,000,000,000 revolving credit facility dated as of September 28, 2021, as amended, which agreement was described in Item 1.01 of Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on September 30, 2021, and which description is incorporated herein by reference (the “Prior 2021 Revolving Credit Agreement”). The Prior 2021 Revolving Credit Agreement was scheduled to mature on September 28, 2027. Prior 2023 Revolving Credit Agreement In connection with entering into the Revolving Credit Agreement, effective September 18, 2026, Company, Aon Corporation, AGH, AGL and ANA terminated their $1,000,000,000 revolving credit facility dated as of October 19, 2023, as amended, which agreement was described in Item 1.01 of Company’s Current Report on Form 8-K filed with the Securities and Exchange Commission on October 24, 2023, and which description is incorporated herein by reference (the “Prior 2023 Revolving Credit Agreement”). The Prior 2023 Revolving Credit Agreement was scheduled to mature on October 19, 2028. Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant The information set forth under Item 1.01 and Item 1.02 of this Current Report on Form 8-K is incorporated by reference herein. Item 9.01 Financial Statements and Exhibits. (d) Exhibits 10.1 Credit Agreement, dated as of September 18, 2026, by and among Aon North America, Inc., Aon plc, Aon Corporation, Aon Global Holdings plc and Aon Global Limited, Citibank, N.A., as administrative agent, BofA Securities, Inc., as syndication agent, and the lenders party thereto. 10.2 Credit Agreement, dated as of September 18, 2026, by and among Aon North America, Inc., Aon Corporation, Aon Global Holdings plc, Aon UK Limited, Aon Global Limited, Aon plc, as guarantor, Citibank, N.A., as administrative agent, BofA Securities, Inc., as syndication agent, and the lenders party thereto. 104 Cover Page Interactive Data File (embedded within 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. AON PLC By: /s/ David DeBrunner Name: David DeBrunner Title: Senior Vice President, Global Controller and Chief Accounting Officer Date: September 22, 2026

Aon plc: Entry Into A Material Definitive Agreement, Termination Of A Material Definitive Agreement, Creation Of A Direct Financial Obligation Or An Obligation Under An, Financial Statements And Exhibits

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