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SAN FRANCISCO--(BUSINESS WIRE)-- 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 Name of person dealing (Note 1) Farallon Capital Management, L.L.C. on behalf of funds managed jointly with Farallon Partners, L.L.C 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 29 April 2021 Long Short Number (%) Number (%) (1) Relevant securities 2,652,414 1.17 3,227,492 1.42 (2) Derivatives (other than options) (3) Options and agreements to purchase/sell Total 2,652,414 1.17 3,227,492 1.42 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 Purchase/sale Number of relevant securities Price per unit (Note 5) Sale 21,600 USD 238.7062 Sale 24,345 USD 237.7556 Product name, e.g. CFD Nature of transaction (Note 6) Number of relevant securities (Note 7) Price per unit (Note 5) 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) Product name, e.g. call option Number of securities Exercise price per unit (Note 5) 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) Yes Date of disclosure 30 April 2021 Contact name Caitlin Shreve Telephone number +1 415 421 2132 If a connected EFM, name of offeree/offeror with which connected If a connected EFM, state nature of connection (Note 10) Ap23 SUPPLEMENTAL FORM 8 IRISH TAKEOVER PANEL DISCLOSURE UNDER RULE 8.1 AND RULE 8.3 OF THE IRISH TAKEOVER PANEL ACT, 1997, TAKEOVER RULES, 2013 DETAILS OF OPEN POSITIONS (This form should be attached to Form 8.1(a) & (b)(i), Form 8.1(b)(ii) or Form 8.3, as appropriate) OPEN POSITIONS (Note 1) Product name, e.g. call option Written, or purchased Number of relevant securities to which the option or derivative relates Exercise price (Note 2) Type, e.g. American, European etc. Expiry date Notes For full details of disclosure requirements, see Rule 8 of the Rules. If in doubt, consult the Panel.

Answer: Form 8.3 - Aon PLC