You are given a text that consists of multiple sentences. Your task is to perform abstractive summarization on this text. Use your understanding of the content to express the main ideas and crucial details in a shorter, coherent, and natural sounding text.

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 Name of person dealing Massachusetts Financial Services Company Company dealt in AON PLC Class of relevant security to which the dealings being disclosed relate Class A Ordinary Shares (IE00BLP1HW54) Date of dealing 20 January 2021 2. INTERESTS AND SHORT POSITIONS (a) Interests and short positions (following dealing) in the class of relevant security dealt in Long Short Number (%) Number (%) (1) Relevant securities 20,063,971 shares 8.78 % (2) Derivatives (other than options): (3) Options and agreements to purchase/sell: Total 20,063,971 shares 8.78 % (b) Interests and short positions in relevant securities of the company, other than the class dealt in Class of relevant security: Long Short Number (%) Number (%) (1) Relevant securities (2) Derivatives (other than options): (3) Options and agreements to purchase/sell: Total 3. DEALINGS (a) Purchases and sales Purchase/sale Number of relevant securities Price per unit In Kind Received 659 shares 209.1600 USD In Kind Delivered 13 shares 211.9400 USD Purchase 2,049 shares 209.2240 USD Purchase 1,198 shares 210.8641 USD Purchase 357 shares 211.2024 USD Sale 6 shares 211.3200 USD Sale 362 shares 210.5955 USD Sale 6,463 shares 209.8297 USD (b) Derivatives transactions (other than options transactions) Product name e.g. CFD Nature of transaction Number of relevant securities Price per unit (c) Options transactions in respect of existing relevant securities (i) Writing, selling, purchasing or varying Product name e.g. call option Writing, purchasing, selling, varying etc. Number of securities to which the option relates Exercise price Type, e.g. American, European etc. Expiry date Option money paid/ received per unit (ii) Exercising Product name e.g. call option Number of securities Exercise price per unit (d) Other dealings (including subscribing for new securities) Nature of transaction Details Price per unit (if applicable) 4. 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? NO Date of disclosure 21 January 2021 Contact name Robert R. Flaherty Telephone number 617-954-5814 If a connected EFM, name of offeree/offeror with which connected If a connected EFM, state nature of connection

Answer: Form 8.3 - Aon plc