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LONDON--(BUSINESS WIRE)-- Ap19 FORM 8.3 - Amendment to Purchase 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) Number (%) Number (%) (1) 426,754 0.19% 2,313,988 1.01% (2) 569,534 0.25% 30,257 0.01% (3) 23,000 0.01% 23,000 0.01% 1,019,288 0.44% 2,367,245 1.04% (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 2 226.7675 USD 38 226.8921 USD 68 227.3925 USD 86 228.0000 USD 100 227.2800 USD 100 228.1050 USD 100 226.3800 USD 100 228.0600 USD 145 229.8700 USD 262 227.4712 USD 300 226.8200 USD 300 227.4566 USD 306 226.5890 USD 345 226.5243 USD 400 226.4000 USD 500 227.0379 USD 600 226.5383 USD 1,033 226.5347 USD 1,100 226.5372 USD 1,185 227.1751 USD 1,300 228.0015 USD 1,600 227.2750 USD 1,964 227.3975 USD 2,151 226.8096 USD 2,786 227.9829 USD 3,132 226.5420 USD 3,645 228.0058 USD 3,700 227.9133 USD 3,700 228.1274 USD 3,704 227.7957 USD 4,360 227.3456 USD 4,508 227.7371 USD 4,526 226.9726 USD 4,571 227.9854 USD 5,246 227.8833 USD 5,801 227.9104 USD 5,890 226.5500 USD 6,224 227.8526 USD 7,140 227.7591 USD 7,304 227.8665 USD 7,765 227.8695 USD 9,186 227.0063 USD 9,568 227.2166 USD 19,559 226.7385 USD 19,853 226.6054 USD 23,820 227.9755 USD 2 226.7675 USD 38 226.8921 USD 100 226.4900 USD 100 227.8500 USD 100 227.1100 USD 100 227.5000 USD 100 227.8800 USD 145 229.8700 USD 200 228.3500 USD 200 226.4500 USD 312 227.2443 USD 346 227.7102 USD 440 226.8926 USD 671 228.2482 USD 763 226.5584 USD 860 227.3667 USD 1,051 226.5300 USD 1,184 226.5462 USD 1,977 228.1794 USD 2,805 226.5464 USD 2,871 227.2554 USD 3,052 228.1609 USD 4,400 228.2674 USD 5,594 227.4663 USD 5,793 226.5500 USD 7,565 227.9070 USD 15,663 227.9822 USD 24,078 226.9509 USD 40,000 226.7452 USD 59,271 227.7915 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 YES 16 Feb 2021 Large Holdings Regulatory Operations 020 3134 7213 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) Written or Number of Exercise Type Expiry purchased relevant securities price date to which the option or derivative relates Purchased 23,000 220.0000 American Jul 16, 2021 Purchased -23,000 200.0000 American Jul 16, 2021 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 - AMENDMENT