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LONDON--(BUSINESS WIRE)-- Ap19 FORM 8.3 Amendment to 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) (1) 427,288 0.19% 2,382,941 1.04% (2) 621,520 0.27% 44,371 0.02% (3) 23,000 0.01% 23,000 0.01% 1,071,808 0.47% 2,450,312 1.07% (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 1 207.2900 USD 3 206.8533 USD 3 206.7700 USD 20 207.1350 USD 31 207.3141 USD 32 207.6500 USD 70 207.5174 USD 100 206.3900 USD 100 206.9192 USD 106 205.7000 USD 174 206.8431 USD 200 205.6600 USD 295 207.3603 USD 324 207.1051 USD 340 207.0492 USD 371 207.0328 USD 379 207.2135 USD 400 206.6981 USD 490 206.5345 USD 509 206.8237 USD 829 206.9041 USD 893 206.9295 USD 1,109 206.8268 USD 1,229 206.7104 USD 1,254 206.7951 USD 1,623 206.4784 USD 1,649 206.7891 USD 1,993 206.9188 USD 2,060 206.6933 USD 2,516 207.6389 USD 2,526 206.9166 USD 2,829 206.7068 USD 3,029 206.6582 USD 3,152 206.6800 USD 3,464 206.6442 USD 3,603 207.0537 USD 4,092 206.8297 USD 6,158 206.5624 USD 6,435 206.6628 USD 6,780 205.4639 USD 13,423 206.6955 USD 16,000 206.6325 USD 17,324 206.6295 USD 22,847 206.6291 USD 23,955 206.4411 USD 28,756 206.6441 USD 108,000 206.7432 USD 1 207.2900 USD 1 207.1700 USD 2 206.8400 USD 3 206.7700 USD 4 207.2000 USD 4 206.7850 USD 5 206.8780 USD 6 207.1800 USD 11 207.1586 USD 12 206.8216 USD 16 207.2571 USD 16 206.7609 USD 32 207.6500 USD 57 207.7177 USD 100 204.3500 USD 100 204.3600 USD 100 205.8600 USD 100 207.0400 USD 100 208.3000 USD 102 207.0000 USD 106 207.6170 USD 106 205.7000 USD 128 206.8575 USD 161 204.1861 USD 167 207.4849 USD 182 206.2919 USD 192 206.9804 USD 200 204.3850 USD 207 206.6392 USD 247 206.9896 USD 300 207.3833 USD 300 207.3766 USD 406 206.0799 USD 480 207.1370 USD 485 207.0465 USD 525 206.9771 USD 532 206.9675 USD 534 206.7547 USD 550 206.8744 USD 703 205.4041 USD 711 206.7432 USD 800 206.1480 USD 800 206.1562 USD 856 206.6754 USD 870 206.2793 USD 900 207.7933 USD 939 207.0045 USD 975 207.2284 USD 1,093 206.7190 USD 1,095 207.1075 USD 1,200 207.1308 USD 1,601 206.2105 USD 1,700 207.1208 USD 1,781 206.9977 USD 1,900 206.6442 USD 2,592 206.6644 USD 2,803 207.1257 USD 3,345 206.6800 USD 3,407 206.6372 USD 3,801 205.9386 USD 5,170 206.7192 USD 5,409 206.4319 USD 6,358 206.5627 USD 6,792 205.8813 USD 10,523 206.5752 USD 11,032 206.2312 USD 11,843 207.0333 USD 11,845 206.4942 USD 13,023 206.7054 USD 15,124 206.7456 USD 67,476 206.6505 USD 87,285 206.7633 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 Is a Supplemental Form 8 attached? (Note 9) YES/NO 5 Feb 2021 Large Holdings Regulatory Operations 020 3134 7213 23,000 220.0000 American -23,000 200.0000 American

Answer: Form 8.3 - AON PLC - AMENDMENT