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MILWAUKEE--(BUSINESS WIRE)-- Ap19 FORM 8.3 IRISH TAKEOVER PANEL DISCLOSURE UNDER RULE 8.3 OF THE IRISH TAKEOVER PANEL ACT, 1997, TAKEOVER RULES, 2013 DEALINGS BY PERSONS WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR MORE 1. KEY INFORMATION Name of person dealing (Note 1) Artisan Partners Limited Partnership Company dealt in Aon PLC Class of relevant security to which the dealings being disclosed relate (Note 2) US$0.01 ordinary shares Date of dealing January 21, 2021 2. INTERESTS AND SHORT POSITIONS a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 3) Long Short Number (%) Number (%) (1) Relevant securities 3,566,720.00 1.56 0.00 0.00 (2) Derivatives (other than options) 0.00 0.00 0.00 0.00 (3) Options and agreements to purchase/sell 0.00 0.00 0.00 0.00 Total 3,566,720.00 1.56 0.00 0.00 b) Interests and short positions in relevant securities of the company, other than the class dealt in (Note 3) Class of relevant security: Long Short Number (%) Number (%) (1) Relevant securities (2) Derivatives (other than options) (3) Options and agreements to purchase/sell Total Ap20 1. DEALINGS (Note 4) a) Purchases and sales Purchase/sale Number of relevant securities Price per unit (Note 5) Sale 1,606 $209.47 USD Sale 5,000 $213.40 USD Sale 2,413 $211.47 USD b) Derivatives transactions (other than options transactions) Product name, e.g. CFD Nature of transaction (Note 6) Number of relevant securities (Note 7) Price per unit (Note 5) c) Options transactions in respect of existing relevant securities i) Writing, selling, purchasing or varying Product name, e.g. call option Writing, selling, purchasing, varying etc. Number of securities to which the option relates (Note 7) Exercise price Type, e.g. American, European etc. Expiry date Option money paid/received per unit (Note 5) ii) Exercising Product name, e.g. call option Number of securities Exercise price per unit (Note 5) d) Other dealings (including transactions in respect of new securities) (Note 4) Nature of transaction (Note 8) Details Price per unit (if applicable) (Note 5) Ap21 2. OTHER INFORMATION Agreements, arrangements or understandings relating to options or derivatives Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated. Is a Supplemental Form 8 attached? (Note 9) NO Date of disclosure January 22, 2021 Contact name Gabriel Ceci Telephone number 414-390-2058 If a connected EFM, name of offeree/offeror with which connected If a connected EFM, state nature of connection (Note 10)

Answer: Form 8.3 - Aon PLC