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LONDON--(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 2. INTERESTS AND SHORT POSITIONS (a) Interests and short positions (following dealing) in the class of relevant security dealt in (Note 3) (1) 426,210 0.19% 3,222,516 1.41% (2) 950,845 0.42% 28,729 0.01% (3) 0 0.00% 0 0.00% 1,377,055 0.60% 3,251,245 1.42% (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 Number of relevant securities Price per unit 1 210.5500 USD 1 210.5000 USD 1 210.4800 USD 1 210.1000 USD 2 209.9000 USD 2 209.7900 USD 2 210.0900 USD 3 210.1400 USD 4 209.9925 USD 5 210.1140 USD 10 210.3300 USD 15 209.8900 USD 17 210.1541 USD 21 208.8942 USD 25 210.1010 USD 26 210.0794 USD 39 210.3800 USD 70 208.5000 USD 74 210.1058 USD 89 210.1548 USD 100 210.0050 USD 100 210.4400 USD 200 210.0550 USD 200 209.3800 USD 233 209.7460 USD 474 210.2424 USD 521 210.1925 USD 641 210.2398 USD 908 210.1461 USD 1,685 210.0115 USD 2,183 210.0600 USD 6,230 210.1800 USD 8,739 209.7667 USD 10,266 210.0400 USD 10,764 209.8348 USD 10,800 209.9703 USD 30,828 209.9212 USD 2 210.0800 USD 2 210.3150 USD 2 210.1100 USD 2 209.9900 USD 3 210.0933 USD 3 210.0450 USD 3 210.2700 USD 4 210.4500 USD 4 209.7900 USD 9 210.0900 USD 10 210.3300 USD 13 209.9430 USD 13 210.4673 USD 15 209.8900 USD 26 210.0794 USD 28 209.9121 USD 70 208.5000 USD 74 210.1059 USD 100 207.8500 USD 100 210.3800 USD 100 210.4600 USD 100 210.2300 USD 100 210.0400 USD 100 210.0300 USD 100 210.0000 USD 100 209.9100 USD 144 210.1419 USD 155 210.1964 USD 204 210.2623 USD 205 210.0482 USD 280 210.0707 USD 327 210.1261 USD 366 210.1909 USD 600 209.9408 USD 625 210.0518 USD 847 210.1561 USD 854 209.5119 USD 1,292 210.0092 USD 1,990 209.9805 USD 2,386 210.0408 USD 3,480 209.9910 USD 3,882 209.8131 USD 5,239 209.9840 USD 5,508 209.8048 USD 6,142 210.1800 USD 6,684 209.9419 USD 6,869 209.9879 USD 8,400 209.9551 USD 8,795 209.8243 USD 8,973 210.0437 USD 10,048 209.8414 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. None NO 4 Dec 2020 Large Holdings Regulatory Operations 020 3134 7213

Answer: FORM 8.3 AON PLC