Aon and Willis Towers Watson to combine

I am pleased to share some important news with you. Aon announced on the 9 March 2020, that we have agreed to combine with Willis Towers Watson to accelerate innovation on behalf of clients. The combined company, to be named Aon, will be the premier, technology-enabled global professional services business focused on the areas of risk, retirement and health. You can read a press release issued, listen to a replay of our Investor Relations call and find more information here: www.aon.com. The combined organisations will be better positioned to address unmet client need and unlock new sources of value for all stakeholders. This combination brings together expertise and data from across both organisations that can be transformed into better insights that will accelerate the creation of new solutions. As we bring together diverse colleague experience and shared values, we will fundamentally be a better organisation together with a more innovative platform capable of delivering better outcomes for all stakeholders; including clients, colleagues, partners and investors. It is important to keep in mind that this announcement is just the first step in this process. Until the transaction closes, which is expected in the first half of 2021, Aon and Willis Towers Watson must act as separate and independent companies. That means it is business as usual at Aon. We won't begin interacting with Willis Towers Watson or sharing client information at this time, and there will be no changes to our current relationship, team or our commitment to providing the exceptional service you have come to expect from us. As always, meeting your needs remains our top priority, and we look forward to our continued relationship. Regards, Terence Williams Chief Executive Officer

ENDS

Forward-Looking Statements This document contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. You can identify these statements and other forward-looking statements in this document by words such as "may", "will", "would", "expect", "anticipate", "believe", "estimate", "plan", "intend", "continue", or similar words, expressions or the negative of such terms or other comparable terminology. These statements include, but are not limited to, such things as: the ability to consummate the proposed transaction; the ability to obtain requisite regulatory and shareholder approvals and the satisfaction of other conditions to the consummation of the proposed transaction on the proposed terms and schedule; the ability of Willis Towers Watson and Aon to successfully integrate their respective operations and employees and realize synergies and cost savings at the times, and to the extent, anticipated; the potential impact of the announcement or consummation of the proposed transaction on relationships, including with employees, suppliers, customers and competitors; changes in general economic, business and political conditions, including changes in the financial markets; significant competition that Willis Towers Watson and Aon face; compliance with extensive government regulation; the combined company's ability to make acquisitions and its ability to integrate or manage such acquired businesses; and other risks detailed in the "Disclaimer Regarding Forward-looking Information," "Risk Factors" and other sections of Willis Towers Watson's Form 10-K and other filings with the Securities and Exchange Commission and in the "Information Concerning Forward-Looking Statements," "Risk Factors" and other sections of Aon's Form 10-K and other filings with the Securities and Exchange Commission. Although Willis Towers Watson and Aon believe that the assumptions underlying the forward-looking statements are reasonable, any of these assumptions, and therefore also the forward-looking statements based on these assumptions, could themselves prove.