Our history

Aon is a united firm. We advance the boundaries of what's possible for our clients, colleagues and communities every day. Through our unique global strengths, we empower today and tomorrow – bringing to bear our distinct expertise, analytics and creativity to fuel superior results and unrivalled client value. From every angle, we're dedicated to liberating the power of people and financial opportunities, giving our clients the solutions they need today to define a greater tomorrow. Exciting times lie ahead.

W. Clement Stone founds an insurance enterprise that would become Combined Insurance Company of America, directly selling supplemental life, accident and health insurance policies to individuals.

Ted Hewitt founds Edwin Shields Hewitt & Associates, a brokerage house focusing on insurance and financial services – they sign Parker Pen as their first client a year later.

Edwin Shields Hewitt & Associates officially becomes Hewitt Associates.

Hewitt introduces "Total Compensation Measurement", the gold standard for comparisons of overall compensation for individuals in different organisations.

Combined International Corporation, the result of a 1982 merger with Ryan Insurance Group, changes its name to Aon Corporation.

Hewitt publishes "Fundamentals of Flexible Compensation" - the go-to book for the industry

Aon is added to Standard & Poor’s 500 index.

Hewitt becomes a publicly traded company.

Hewitt merges with Exult to form the industry leader in HR Business Process Outsourcing.

Aon Re Global and Benfield Group Ltd come together to form Aon Benfield, the largest reinsurance firm in the world.

Aon is voted "Best Employee Benefits Consultant", "Best Retail Brokerage with revenues greater than $250 million", "Best Reinsurance Intermediary" and "Best Captive Manager" by the readers of Business Insurance magazine.

A merger affecting the entire human capital consulting industry. At the same time the group's global Investment Practice is significantly strengthened with the acquisition of EnnisKnupp. As a combined entity, Aon Hewitt becomes one of the largest providers of investment consulting services in the world.
Aon becomes official sponsor of Manchester United Football Club, the number one sports brand in the world's number one sport.

Relocating our corporate headquarters from Chicago to London. We are the first ever US S&P 500 company to domicile itself in the UK – which underlines the international importance of London within the global insurance market. We also continue to maintain and grow our US presence.

The next big event on the horizon is our move to the Aon Centre. This is scheduled for 2015 and will see us occupy state-of-the-art offices in The Leadenhall Building.