Investor Presentaiton

Unconditional and Irrevocable Cross Guarantee Structure Ensures Debt Securities Rank Pari Passu¹ • • Issuers and Guarantors of Debt Securities as of June 30, 2023 Entity Aon plc Aon Global Limited Aon Global Holdings plc Aon North America, Inc. Aon Corporation Jurisdiction of Incorporation Ireland UK UK US US Aon plc is the Irish-domiciled publicly traded parent company of the Aon group There are three Aon entities with outstanding debt securities: Aon Global Limited ("AGL"), Aon Global Holdings plc ("AGH"), and Aon Corporation о Each of these entities is an indirect wholly owned subsidiary of Aon plc and has senior unsecured ratings consistent with those of Aon plc (Baa2/A- /BBB+) Outstanding senior notes rank pari passu due to unconditional and irrevocable cross guarantee structure Aon Global Limited Notes ($3.9B) 4.000% USD 350M Senior Notes due 2023 3.500% USD 600M Senior Notes due 2024 3.875% USD 750M Senior Notes due 2025 2.875% EUR 500M Senior Notes due 20263 4.250% USD 256M Senior Notes due 2042 4.450% USD 250M Senior Notes due 2043 4.600% USD 550M Senior Notes due 2044 4.750% USD 600M Senior Notes due 2045 Aon Corporation Notes ($2.9B) Guarantor Issuer Guarantor Guarantor Guarantor 8.205% USD 521M Junior Sub Notes due 2027 4.500% USD 350M Senior Notes due 2028 3.750% USD 750M Senior Notes due 2029 2.800% USD 1000M Senior Notes due 2030 6.250% USD 300M Senior Notes due 2040 Guarantor Guarantor Guarantor Guarantor Issuer Aon Corporation and Aon Global Holdings plc Notes ($4.3B) 2.850% USD 600M Senior Notes due 2027 2.050% USD 400M Senior Notes due 2031 2.600% USD 500M Senior Notes due 2031 5.000% USD 500M Senior Notes due 2032 5.350% USD 750M Senior Notes due 2033 2.900% USD 600M Senior Notes due 2051 3.900% USD 900M Senior Notes due 2052 Guarantor Guarantor Co-Issuer Guarantor Co-Issuer Aon moved its parent company headquarters to the UK in 2012 and Ireland in 2020, and as a result, has issued term debt from multiple legal entities, however, our cross-guarantee structure ensures debt securities rank pari passu AON 1 2 AGL 2.875% EUR 500M Senior Notes due 2026 converted to USD at 1.09 FX rate. 12

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