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LONDON--(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 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) 399,801 0.17% 2,444,220 1.06% (2) 538,686 0.23% 28,200 0.01% (3) 106,599 0.05% 106,599 0.05% 1,045,086 0.45% 2,579,019 1.11% (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 1. DEALINGS (Note 4) (a) Purchases and sales Purchase/sale Number of relevant securities Price per unit Purchase 1 206.9200 USD Purchase 8 205.7700 USD Purchase 24 205.6600 USD Purchase 39 206.4900 USD Purchase 66 204.6900 USD Purchase 99 204.6455 USD Purchase 100 205.7200 USD Purchase 100 206.6800 USD Purchase 100 206.4700 USD Purchase 100 205.2800 USD Purchase 100 205.2000 USD Purchase 110 205.2254 USD Purchase 135 205.2285 USD Purchase 188 204.6657 USD Purchase 200 204.6350 USD Purchase 200 204.6800 USD Purchase 200 204.6700 USD Purchase 200 206.0900 USD Purchase 208 205.7171 USD Purchase 257 205.9600 USD Purchase 310 206.1208 USD Purchase 413 205.8020 USD Purchase 586 205.2344 USD Purchase 590 205.1864 USD Purchase 648 206.7051 USD Purchase 678 206.3453 USD Purchase 908 206.2350 USD Purchase 2,248 206.1483 USD Purchase 3,400 206.2909 USD Purchase 6,644 206.3283 USD Purchase 6,994 206.3842 USD Purchase 9,300 206.4204 USD Purchase 9,496 206.4611 USD Purchase 9,608 206.2987 USD Purchase 11,247 206.9147 USD Purchase 19,574 206.3000 USD Purchase 21,600 206.5522 USD Purchase 29,186 206.2278 USD Sale 2 206.2500 USD Sale 3 206.1133 USD Sale 5 205.3560 USD Sale 6 205.5850 USD Sale 6 206.3766 USD Sale 8 205.0312 USD Sale 8 205.5462 USD Sale 9 206.5500 USD Sale 9 205.8144 USD Sale 10 206.0600 USD Sale 10 205.9700 USD Sale 10 205.9690 USD Sale 10 205.0700 USD Sale 12 205.9500 USD Sale 12 206.4400 USD Sale 14 206.2550 USD Sale 17 205.9564 USD Sale 18 205.5294 USD Sale 19 205.8494 USD Sale 20 205.8850 USD Sale 20 205.5350 USD Sale 23 206.7039 USD Sale 24 206.2704 USD Sale 27 206.3448 USD Sale 30 206.2453 USD Sale 30 205.6133 USD Sale 50 205.5140 USD Sale 60 206.3560 USD Sale 64 206.5217 USD Sale 69 206.8034 USD Sale 79 206.4500 USD Sale 84 206.3320 USD Sale 86 205.3993 USD Sale 100 206.1100 USD Sale 100 206.0700 USD Sale 100 207.9000 USD Sale 100 206.5100 USD Sale 100 206.4650 USD Sale 100 206.8100 USD Sale 136 206.4455 USD Sale 183 206.3846 USD Sale 200 205.7450 USD Sale 200 206.6225 USD Sale 208 205.7171 USD Sale 291 206.4398 USD Sale 300 206.4966 USD Sale 300 206.4833 USD Sale 300 206.5833 USD Sale 318 206.5912 USD Sale 330 205.9075 USD Sale 368 206.4917 USD Sale 414 206.0242 USD Sale 462 206.1059 USD Sale 501 206.4639 USD Sale 512 206.6071 USD Sale 582 206.6242 USD Sale 600 205.4983 USD Sale 620 206.4587 USD Sale 646 206.4857 USD Sale 753 204.6701 USD Sale 814 206.6074 USD Sale 820 205.4010 USD Sale 973 206.4688 USD Sale 1,016 206.1806 USD Sale 1,400 205.2510 USD Sale 1,538 206.2985 USD Sale 1,700 206.2909 USD Sale 1,710 206.1827 USD Sale 2,000 206.5890 USD Sale 2,430 206.4367 USD Sale 4,196 206.3000 USD Sale 4,235 206.4691 USD Sale 6,785 206.5633 USD Sale 6,898 207.0064 USD Sale 7,006 206.3665 USD Sale 8,892 206.4313 USD Sale 9,632 206.2972 USD Sale 10,100 206.5375 USD Sale 12,961 206.4257 USD Sale 38,026 206.2498 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) 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 YES 1 Oct 2020 Large Holdings Regulatory Operations 020 3134 7213 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) Put Options Purchased -106,599 214.5780 European Oct 20, 2020 Put Options Written 106,599 214.5780 European Oct 20, 2020 Notes 1. Where there are open option positions or open derivative positions (except for CFDs), full details should be given. Full details of any existing agreements to purchase or to sell must also be given on this form. 2. For all prices and other monetary amounts, the currency must be stated. For full details of disclosure requirements, see Rule 8 of the Rules. If in doubt, consult the Panel.

Answer: FORM 8.3 - AON PLC