AON 10-K Annual Report Dec. 31, 2023 | Alphaminr
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AON 10-K Fiscal year ended Dec. 31, 2023

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AON PLC
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TABLE OF CONTENTS
Part IItem 1. BusinessItem 1A. Risk FactorsItem 1B. Unresolved Staff CommentsItem 1C. CybersecurityItem 2. PropertiesItem 3. Legal ProceedingsItem 4. Mine Safety DisclosurePart IIItem 5. Market For Registrant S Common Equity, Related Stockholder Matters and Issuer Purchases Of Equity SecuritiesItem 6. [reserved]Item 7. Management S Discussion and Analysis Of Financial Condition and Results Of OperationsItem 7A. Quantitative and Qualitative Disclosures About Market RiskItem 8. Financial Statements and Supplementary DataItem 9. Changes in and Disagreements with Accountants on Accounting and Financial DisclosureItem 9A. Controls and ProceduresItem 9B. Other InformationItem 9C. Disclosure Regarding Foreign Jurisdictions That Prevents InspectionsPart IIIItem 10. Directors, Executive Officers and Corporate GovernanceItem 11. Executive CompensationItem 12. Security Ownership Of Certain Beneficial Owners and Management and Related Stockholder MattersItem 13. Certain Relationships and Related Transactions, and Director IndependenceItem 14. Principal Accountant Fees and ServicesPart IVItem 15. Exhibits and Financial Statement SchedulesItem 16. Form 10-k Summary

Exhibits

2.1* Agreement and Plan of Merger, by and among Aon plc, Randolph Acquisition Corp., Randolph Merger Sub LLC, NFP Intermediate Holdings A Corp. and NFP Parent Co, LLC, dated as of December 19, 2023 incorporated by reference to Exhibit 2.1 to Aons Current Report on Form 8 K filed December 20, 2023. 3.1* Memorandum and Articles of Association of Aon plc incorporated by reference to Exhibit 3.1 to Aons Current Report on Form 8 K filed June 4, 2021. 4.1* Second Amended and Restated Indenture, dated April 1, 2020, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Amended and Restated Indenture, dated April 2, 2012, amending and restating the Indenture, dated January 13, 1997) - incorporated by reference to Exhibit 4.1 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.6* Second Amended and Restated Indenture, dated April 1, 2020, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Amended and Restated Indenture, dated April 2, 2012, amending and restating the Indenture, dated September 10, 2010) - incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.7* Form of 6.25% Senior Note due 2040 incorporated by reference to Exhibit4.4 to Aons Current Report on Form8-K filed on September10, 2010. 4.8* Indenture dated as of March8, 2011, among Aon Finance N.S. 1,ULC, Aon Corporation and Computershare Trust Company of Canada. incorporated by reference to Exhibit4.1 to Aons Current Report on Form8-K filed on March8, 2011. 4.9* First Supplemental Indenture, dated April 2, 2012, among Aon Finance N.S. 1, ULC, Aon Corporation, Aon plc and Computershare Trust Company of Canada (supplementing the Indenture, dated March 8, 2011) - incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K12B filed April 2, 2012. 4.10* Amended and Restated Indenture, dated April 1, 2020, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Indenture, dated December 12, 2012) - incorporated by reference to Exhibit 4.3 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.11* Form of 4.250% Senior Note Due 2042 - incorporated by reference to Exhibit 4.6 to Aons Registration Statement on Form S-4 (File No. 333-187637) filed on March 29, 2013. 4.12* Second Amended and Restated Indenture, dated April 1, 2020, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Amended and Restated Indenture, dated May 20, 2015, amending and restating the Indenture, dated May 24, 2013) - incorporated by reference to Exhibit 4.4 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.13* Formof 4.45% Senior Note due 2043 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed on May 24, 2013. 4.14* Formof 4.00% Senior Note due 2023 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed on November 26, 2013. 4.15* Form of 3.500% Senior Note due 2024 - incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed on May 27, 2014. 4.16* Form of 4.600% Senior Note due 2044 - incorporated by reference to Exhibit 4.3 to Aons Current Report on Form 8-K filed on May 27, 2014. 4.17* Form of 4.750% Senior Note due 2045 - incorporated by reference to Exhibit 4.1 to Aons Current Report on Form 8-K filed on May 20, 2015. 4.18* Amended and Restated Indenture, dated April 1, 2020, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Indenture, dated November 13, 2015) - incorporated by reference to Exhibit 4.5 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.19* Form of 3.875% Senior Note due 2025 - incorporated by reference to Exhibit 1.1 to Aons Current Report on Form 8-K filed on February 29, 2016. 4.20* Amended and Restated Indenture, dated April 1, 2020, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc and The Bank of New York Mellon Trust Company, N.A. (amending and restating the Indenture, dated December 3, 2018) - incorporated by reference to Exhibit 4.6 to Aons Current Report on Form 8-K12B filed April 1, 2020. 4.21* Form of 4.500% Senior Note due 2028 - incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed December 3, 2018. 4.22* Form of 3.750% Senior Note due 2029, incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed May 2, 2019. 4.23* Form of 2.200% Senior Note due 2022, incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed November 15, 2019. 4.24* Form of 2.800% Senior Note due 2030 - incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed May 15, 2020. 4.25* Description of Securities of Aon plc that are registered under Section 12 of the Securities Exchange Act of 1934, as amended incorporated by reference to Exhibit 4.25 to Aons Annual Report on Form 10-K filed February 17, 2023. 4.26* First Indenture Supplement, dated August 23, 2021, among Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon plc and The Bank of New York Mellon Trust Company, N.A., as trustee incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed August 23, 2021. 4.27* Form of 2.050% Senior Note due 2031 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed August 23, 2021. 4.28* Form of 2.900% Senior Note due 2051 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed August 23, 2021. 4.29* Second Indenture Supplement, dated December 2, 2021, among Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon plc and The Bank of New York Mellon Trust Company, N.A., as trustee incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed December 2, 2021. 4.30* Form of 2.600% Senior Note due 2031 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed December 2, 2021. 4.31* Third Indenture Supplement, dated February 28, 2022, among Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon plc and The Bank of New York Mellon Trust Company, N.A., as trustee incorporated by reference to Exhibit 4.2 to Aon Current Report on Form 8-K filed February 28, 2022. 4.32* Form of 2.850% Senior Note due 2027 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed February 28, 2022. 4.33* Form of 3.900% Senior Note due 2052 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed February 28, 2022. 4.34* Fourth Indenture Supplement, dated September 12, 2022, among Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon plc and The Bank of New York Mellon Trust Company, N.A., as trustee incorporated by reference to Exhibit 4.2 to Aon Current Report on Form 8-K filed September 12, 2022. 4.35* Form of 5.000% Senior Note due 2032 incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8-K filed September 12, 2022. 4.36* Amended and Restated Indenture, dated April 1, 2020, among Aon Corporation, Aon plc, AGL, AGH and the Trustee (amending and restating the Indenture, dated December 3, 2018, among Aon Corporation, AGL and the Trustee) (included in Exhibit 4.6 to the Current Report on Form 8 K12B filed by Aon on April 1, 2020) incorporated by reference to Exhibit 4.1 to Aons Current Report on Form 8 K filed February 28, 2023. 4.37* Fifth Indenture Supplement, dated as of February 28, 2023, among Aon Corporation, AGH, the Guarantors and the Trustee incorporated by reference to Exhibit 4.2 to Aons Current Report on Form 8 K filed February 28, 2023. 4.38* Form of 5.350% Senior Notes due 2033 (included in Exhibit 4.2 to the Current Report on Form 8 K filed by Aon on February 28, 2023) incorporated by reference to Exhibit 4.3 to Aons Current Report on Form 8 K filed February 28, 2023. 4.39* First Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.14 to Aons Registration Statement on Form S 3 filed June 22, 2023. 4.40* First Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.16 to Aons Registration Statement on Form S 3 filed June 22, 2023. 4.41* First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.18 to Aons Registration Statement on Form S 3 filed June 22, 2023. 4.42* First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.20 to Aons Registration Statement on Form S 3 filed June 22, 2023. 4.43* First Indenture Supplement, dated June 22, 2023, among Aon plc, Aon Corporation, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.22 to Aons Registration Statement on Form S 3 filed June 22, 2023. 4.44* Sixth Indenture Supplement, dated June 22, 2023, among Aon Corporation, Aon plc, Aon Global Limited, Aon Global Holdings plc, Aon North America, Inc. and The Bank of New York Mellon Trust Company, N.A. incorporated by reference to Exhibit 4.29 to Aons Registration Statement on Form S 3 filed June 22, 2023. 10.1* $1,000,000,000 Credit Agreement, dated September 28, 2021, among Aon plc, Aon Corporation, Aon UK Limited, Aon Global Holdings plc and Aon Global Limited with Citibank, N.A., as administrative agent, the lenders party thereto, HSBC Bank USA, National Association and Morgan Stanley Senior Funding, Inc., as syndication agents, and Citibank, N.A., HSBC Securities (USA) and Morgan Stanley Senior Funding, Inc., as joint lead arrangers and joint bookrunners incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on September 30, 2021. 10.2 Term Loan Credit Agreement, dated as of February 16, 2024, by and among, Aon North America, Inc., Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Citibank, N.A., as administrative agent, HSBC Securities (USA) Inc., JPMorgan Chase Bank, N.A., and Morgan Stanley Senior Funding, Inc. as syndication agents, and the lenders party thereto. 10.3 Amendment No. 1 to the Credit Agreement, dated as of February 16, 2024, by and among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto. 10.4 Amendment No. 3 to the Credit Agreement, dated as of February 16, 2024, by and among Aon plc, Aon Corporation,Aon Global Holdings plc, Aon Global Limited, Aon UK Limited and Aon North America, Inc., Citibank, N.A.,as administrative agent and the lenders party thereto. 10.5 Amendment No. 1 to the Credit Agreement, dated as of May 3, 2023, by and among Citibank, N.A., as administrative agent, Aon Corporation, Aon UK Limited, Aon Global Holdings plc and Aon Global Limited, and the lenders party thereto incorporated by reference to Exhibit 10.4 to Aons Quarterly Report on Form 10 Q filed July 28, 2023. 10.6* Amendment No. 2 to the Credit Agreement, dated as of October 19, 2023, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Aon UK Limited and Aon North America, Inc., Citibank, N.A., as administrative agent and the lenders party thereto incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed October 24, 2023. 10.7* Guaranty Supplement from Aon North America, Inc. to Citibank, N.A., as administrative agent, dated June 22, 2023 incorporated by reference to Exhibit 10.6 to Aons Quarterly Report on Form 10 Q filed July 28, 2023. 10.8* $400,000,000 Five Year Credit Agreement, dated October 19, 2017 (the 2017 Credit Agreement), among Aon plc, Aon Corporation, Citibank, N.A., as administrative agent, the lenders party thereto, HSBC Bank USA, National Association, as syndication agent, and Citigroup Global Markets, Inc. and HSBC Securities (USA) Inc., as joint lead arrangers and joint bookrunners incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed October 20, 2017. 10.9* Form of Notice of Extension of the 2017 Credit Agreement incorporated by reference to Exhibit 10.7 to Aons Annual Report on Form 10 K for the year ended December 31, 2019. 10.10* Lender Assumption Agreement, dated February 27, 2020, among Aon plc, Citibank, N.A. and the parties thereto, with respect to the 2017 Credit Agreement incorporated by reference to Exhibit 10.12 to Aons Quarterly Report on Form 10 Q for the quarter ended March 31, 2020. 10.11* Waiver and Amendment No. 1 to the 2017 Credit Agreement, dated April 1, 2020, among Aon plc, Aon Corporation, Citibank, N.A. and the lenders party thereto incorporated by reference to Exhibit 10.11 to Aons Quarterly Report on Form 10 Q for the quarter ended March 31, 2020. 10.12* Amendment No. 2 to the 2017 Credit Agreement, dated September 28, 2021, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited, Citibank, N.A., as administrative agent, and the lenders party thereto incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed on September 30, 2021. 10.13* Amendment No. 3 to the 2017 Credit Agreement, dated October 19, 2022, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global limited, Citibank, N.A., as administrative agent, and the lenders party thereto incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on October 21, 2022. 10.14* Guaranty Supplement from Aon North America, Inc. to Citibank, N.A., as administrative agent, dated June 22, 2023 incorporated by reference to Exhibit 10.5 to Aons Quarterly Report on Form 10 Q filed July 28, 2023. 10.15* Purchase Agreement, dated February 9, 2017, between Aon plc and Tempo Acquisition, LLC incorporated by reference to Exhibit 2.1 to Aons Current Report on Form 8 K filed February 10, 2017. 10.16* Amendment No. 1 to Purchase Agreement, dated April 17, 2017, between Aon plc and Tempo Acquisition, LLC incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on 10 Q for the quarter ended March 31, 2017. 10.17*# Deed of Assumption of Aon plc, dated April 1, 2020 - incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8-K12B filed April 1, 2020. 10.18*# Deed of Assumption of Aon Global Limited, dated April 2, 2012 - incorporated by reference to Exhibit 10.7 to Aons Current Report on Form 8-K12B filed April 2, 2012. 10.19*# Aon Corporation Outside Director Corporate Bequest Plan (as amended and restated, effective January 1, 2010) - incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10-Q for the quarter ended June 30, 2010. 10.20*# Amended and Restated Aon Stock Incentive Plan - incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed May 24, 2006. 10.21*# First Amendment to the Amended and Restated Aon Stock Incentive Plan - incorporated by reference to Exhibit 10(au) to Aons Annual Report on Form 10-K for the year ended December 31, 2006. 10.22*# Second Amendment to the Amended and Restated Aon Stock Incentive Plan, dated April 2, 2012 - incorporated by reference to Exhibit 10.10 to Aons Current Report on Form 8-K12B filed April 2, 2012. 10.25*# First Amendment to the Aon Stock Award Plan - incorporated by reference to Exhibit 10(as) to Aons Annual Report on Form 10-K for the year ended December 31, 2006. 10.26*# Aon plc 2011 Incentive Plan (as amended and restated, effective March 29, 2019) - incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10-Q for the quarter ended June 30, 2019. 10.27*# First Amendment to the Aon plc 2011 Incentive Plan, effective September 13, 2021 - incorporated by reference to Exhibit 10.9 to Aons Quarterly Report on Form 10-Q for the quarter ended September 30, 2021. 10.28*# Aon plc 2011 Incentive Plan (as amended and restated effective April 19, 2023) incorporated by reference to Exhibit 10.3 to Aons Quarterly Report on Form 10-Q for the quarter ended June 30,2023. 10.29*# Aon plc Leadership Performance Program (as amended and restated, effective January 1, 2021) - incorporated by reference to Exhibit 10.20 to Aons Annual Report on Form 10-K for the year ended December 31, 2021. 10.30*# Aon plc Senior Executive Combined Severance and Change in Control Plan (as amended and restated, effective June 21, 2019) - incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10-Q for the quarter end June 30, 2019. 10.31*# First Amendment to the Aon plc Amended and Restated Senior Executive Combined Severance and Change in Control Plan, effective September 30, 2021 - incorporated by reference to Exhibit 10.10 to Aons Quarterly Report on Form 10-Q for the quarter ended September 30, 2021. 10.32*# Aon plc Senior Executive Incentive Compensation Plan (as amended and restated, effective January 1, 2021) - incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10-Q for the quarter ended March 31, 2021. 10.33*# Form of Deed of Indemnity of Aon plc - incorporated by reference to Exhibit 10.4 to Aons Current Report on Form 8-K12B filed April 1, 2020. 10.34*# Form of Deed of Indemnity for Directors of Aon Global Limited - incorporated by reference to Exhibit 10.4 to Aons Current Report on Form 8-K12B filed April 2, 2012. 10.35*# Form of Deed of Indemnity for Gregory C. Case - incorporated by reference to Exhibit 10.5 to Aons Current Report on Form 8-K12B filed April 2, 2012. 10.35*# Form of Deed of Indemnity for Executive Officers of Aon plc incorporated by reference to Exhibit 10.6 to Aons Current Report on Form 8 K12B filed April 2, 2012. 10.36*# Form of Service as a Non Executive Director Agreement incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10 Q for the quarter ended September 30, 2016. 10.37*# Amended and Restated Employment Agreement, dated January 16, 2015, among Aon plc, Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed January 23, 2015. 10.38*# Amendment to Employment Agreement, dated April 20, 2018, among Aon plc, Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed April 25, 2018. 10.39*# Amendment to Employment Agreement, dated May 10, 2018, by and among Aon plc, Aon Corporation, and Gregory C. Case incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on May 15, 2018. 10.40*# Amendment to Employment Agreement, dated July 26, 2021, among Aon plc, Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.3 to Aons Current Report on Form 8 K filed on July 26, 2021. 10.41*# Amended and Restated Change in Control Agreement, dated November 13, 2009, between Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed on November 17, 2009. 10.42*# Amendment to the Amended and Restated Change in Control Agreement, dated April 27, 2016, between Aon plc and Gregory C. Case incorporated by reference to Exhibit 10.11 on Aons Quarterly Report on Form 10 Q for the quarter ended March 31, 2016. 10.43*# International Assignment Letter, effective July 1, 2016, between Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10 Q for the quarter ended June 30, 2016. 10.44*# Amendment to International Assignment Letter, dated June 25, 2018, with Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed on June 27, 2018. 10.45*# Amendment to International Assignment Letter, dated June 25, 2019, with Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed on June 25, 2019. 10.46*# Amendment to International Assignment Letter, dated June 19, 2020, between Aon Corporation and Greg C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed June 25, 2020. 10.47*# Amendment to International Assignment Letter, dated July 8, 2021, between Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10 Q for the quarter ended June 30, 2021. 10.48*# Amendment to International Assignment Letter, dated June 21, 2022, between Aon Corporation and Gregory C. Case incorporated by reference to exhibit 10.2 to Aons Current Report on Form 8 K filed June 23, 2022. 10.49*# Amendment to International Assignment Letter, dated June 16, 2023, between Aon Corporation and Gregory C. Case incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed June 22, 2023. 10.50*# Employment Agreement dated as of October 3, 2007 between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on October 3, 2007. 10.51*# Amendment effective as of March 27, 2012 to Employment Agreement between Aon Corporation and Christa Davies dated as of October 3, 2007 incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on March 30, 2012. 10.52*# Amendment to Employment Agreement, dated February 20, 2015, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on February 26, 2015. 10.53*# Amendment to Employment Agreement, dated April 19, 2018, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on April 25, 2018. 10.54*# Amendment to Employment Agreement, dated July 26, 2021, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K filed on July 26, 2021. 10.55*# International Assignment Letter, effective July 1, 2016, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10 Q for the quarter ended June 30, 2016 10.56*# Amendment to International Assignment Letter, dated June 25, 2018, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on June 27, 2018. 10.57*# Amendment to International Assignment Letter, dated June 25, 2019, between Aon Corporation and Christa Davies, incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed on June 25, 2019. 10.58*# Amendment to International Assignment Letter, dated June 19, 2020, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed June 25, 2020. 10.59*# Amendment to International Assignment Letter, dated July 8, 2021, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10 Q for the quarter ended June 30, 2021. 10.60*# Amendment to International Assignment Letter, dated June 21, 2022, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed June 23, 2022. 10.61*# Amendment to International Assignment Letter, dated June 16, 2023, between Aon Corporation and Christa Davies incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed June 22, 2023. 10.62*# Letter Agreement, dated July 16, 2019, between Aon Corporation and Darren Zeidel incorporated by reference to Exhibit 10.50 to Aons Annual Report on Form 10 K for the year ended December 31, 2021 10.63*# Letter Agreement, dated October 22, 2019, between Aon Corporation and Lisa Stevens incorporated by reference to Exhibit 10.51 to Aons Annual Report on Form 10 K for the year ended December 31, 2021. 10.64*# Letter Agreement, dated May 11, 2018, by and between Aon Corporation and Eric Andersen incorporated by reference to Exhibit 10.3 to Aons Current Report on Form 8 K filed on May 15, 2018. 10.65*# Amended and Restated Aon Deferred Compensation Plan, dated November 16, 2016 incorporated by reference to the Annual Report on Form 10 K for the year ended December 31, 2016. 10.66*# First Amendment to the Aon Deferred Compensation Plan, effective December 8, 2016, incorporated by reference to the Annual Report on Form 10 K for the year ended December 31, 2016. 10.67*# Second Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective April 19, 2017 incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10 Q for the quarter ended June 30, 2017. 10.68*# Third Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective December 27, 2019 incorporated by referenced to Exhibit 10.51 to Aons Annual Report on Form 10 K for the year ended December 31, 2019. 10.69*# Fourth Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective May 7, 2020 incorporated by reference to Exhibit 10.60 to Aons Annual Report on Form 10 K for the year ended December 31, 2020. 10.70*# Fifth Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective October 1, 2021 incorporated by reference to Exhibit 10.64 to Aons Annual Report on Form 10 K for the year ended December 31, 2021. 10.71*# Sixth Amendment to the Amended and Restated Aon Deferred Compensation Plan, effective June 30, 2022 incorporated by reference to Exhibit 10.61 to Aons Annual Report on Form 10-K for the year ended December 31, 2023. 10.72*# Aon plc Global Share Purchase Plan, amended and restated effective January 1, 2021 incorporated by reference to Exhibit 10.61 to Aons Annual Report on Form 10 K for the year ended December 31, 2020. 10.73*# Form of Restricted Stock Unit Agreement, incorporated by reference to Exhibit 10.2 to Aons Quarterly Report on Form 10 Q for the quarter ended March 31, 2019. 10.74*# Aon Supplemental Savings Plan, amended and restated effective January 1, 2017, incorporated by reference to Exhibit 10.52 to Aons Annual Report on Form 10 K for the year ended December 31, 2016. 10.75*# First Amendment to the Aon Supplemental Savings Plan, effective March 30, 2017, incorporated by reference to Exhibit 10.52 to Aons Annual Report on Form 10 K for the year ended December 31, 2017. 10.76*# Second Amendment to the Aon Supplemental Savings Plan, effective December 31, 2018 incorporated by reference to Exhibit 10.58 to Aons Annual Report on Form 10 K for the year ended December 31, 2019. 10.77*# Third Amendment to the Aon Supplemental Savings Plan, effective December 27, 2019 incorporated by reference to Exhibit 10.59 to Aons Annual Report on Form 10 K for the year ended December 31, 2019. 10.78*# Fourth Amendment to the Aon Supplemental Savings Plan, effective May 1, 2020 incorporated by reference to Exhibit 10.68 to Aons Annual Report on Form 10 K for the year ended December 31, 2020. 10.79*# Fifth Amendment to the Aon Supplemental Savings Plan, effective January 1, 2021 incorporated by reference to Exhibit 10.69 to Aons Annual Report on Form 10 K for the year ended December 31, 2020. 10.80*# Sixth Amendment to the Aon Supplemental Savings Plan, effective October 1, 2021 incorporated by reference to Exhibit 10.74 to Aons Annual Report on Form 10 K for the year ended December 31, 2021. 10.81*# Seventh Amendment to the Aon Supplemental Savings Plan, effective June 30, 2022 incorporated by reference to Exhibit 10.71 to Aons Annual Report on Form 10-K for the year ended December 31, 2023. 10.82*# Aon Corporation Excess Benefit Plan (as amended and restated, effective January 1, 2009) and the following amendments thereto: First Amendment, dated January 1, 2009, Second Amendment, dated December 16, 2009, Third Amendment, dated December 31, 2018, and Fourth Amendment, dated December 27, 2019 incorporated by reference to Exhibit 10.60 to Aons Annual Report on Form 10 K for the year ended December 31, 2019. 10.83*# Master Assignment, Assumption and Amendment Deed to Change in Control Arrangements of Aon plc, dated April 1, 2020 incorporated by reference to Exhibit 10.2 to Aons Current Report on Form 8 K12B filed April 1, 2020. 10.84*# Master Amendment to the Remaining Plans, dated April 1, 2020, of Aon Corporation incorporated by reference to Exhibit 10.3 to Aons Current Report on Form 8 K12B filed April 1, 2020. 10.84* Form of Irrevocable Director Undertaking incorporated by reference to Exhibit 10.1 to Aons Form 8 K filed March 10, 2020. 10.85*# Form of Acknowledgment of Tax Equalization Process Letter Agreement with Non Employee Directors incorporated by reference to Exhibit 10.74 to Aons Annual Report on Form 10 K for the year ended December 31, 2020. 10.86*# Form of Restricted Stock Unit Agreement incorporated by reference to Exhibit 10.1 to Aons Quarterly Report on Form 10 Q filed April 28, 2023. 10.87*# Employment Agreement, effective as of July 1, 2023, between Aon Corporation and Eric Andersen incorporated by reference to Exhibit 10.7 to Aons Quarterly Report on Form 10 Q filed July 28, 2023. 10.88*# Form of Performance Share Unit Agreement Under Aon plc 2011 Incentive Plan, as amended as restated incorporated by reference to Exhibit 10.8 to Aons Quarterly Report on Form 10 Q filed July 28, 2023. 10.89* Credit Agreement dated as of October 19, 2023, among Aon plc, Aon Corporation, Aon Global Holdings plc, Aon Global Limited and Aon North America, Inc., Citibank, N.A., as administrative agent, and the lenders party thereto incorporated by reference to Exhibit 10.1 to Aons Current Report on Form 8 K filed October 24, 2023. 21.1 List of Subsidiaries of Aon. 22.1 Subsidiary Guarantors and Issuers of Guaranteed Securities 23 Consent of Ernst& Young LLP. 31.1. Rule13a-14(a) Certification of Chief Executive Officer of Aon in accordance with Section302 of the Sarbanes-Oxley Act of 2002. 31.2. Rule13a-14(a) Certification of Chief Financial Officer of Aon in accordance with Section302 of the Sarbanes-Oxley Act of 2002. 32.1. Section1350 Certification of Chief Executive Officer of Aon in accordance with Section906 of the Sarbanes-Oxley Act of 2002. 32.2. Section1350 Certification of Chief Financial Officer of Aon in accordance with Section906 of the Sarbanes-Oxley Act of 2002. 97.1 Aon plc Incentive Repayment Policy (For Section 16 Officers), effective as of October 2, 2023.