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LONDON--(BUSINESS WIRE)-- FORM 8.3 Amendment to Purchase and Sales 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) Long Short Number (%) Number (%) (1) 392,650 0.17% 2,440,290 1.05% (2) 540,999 0.23% 28,200 0.01% (3) 106,599 0.05% 106,599 0.05% (4) 1,040,248 0.45% 2,575,089 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 Ap20 1. DEALINGS (Note 4) (a) Purchases and sales Number of relevant securities 1 3 4 8 9 9 10 10 13 13 18 26 27 42 46 82 97 100 100 100 200 200 234 300 349 384 400 982 1,049 1,191 2,182 3,316 4,121 5,178 6,000 9,760 12,197 13,249 22,015 27,284 46,879 1 1 1 3 6 11 13 13 13 23 24 43 62 100 100 100 100 100 100 100 100 100 100 100 104 136 153 182 199 200 200 200 200 200 200 200 200 200 201 278 300 300 333 387 391 400 400 400 454 488 500 514 600 700 745 800 900 1,037 1,065 1,200 1,200 1,618 1,674 1,736 2,355 2,718 2,914 3,234 4,123 5,009 5,454 6,000 6,058 6,124 8,028 8,939 10,811 12,405 13,194 19,211 22,797 (b) Derivatives transactions (other than options transactions) SWAP Long 414 201.4985 USD (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 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) relates Purchased -106,599 214.5780 European Oct 20, 2020 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 - AMENDMENT