Aon is a leading global provider of insurance and reinsurance brokerage and human resources solutions. Its operations are tilted toward its brokerage operations. Headquartered in London, Aon has about 50,000 employees and operations in over 120 countries.

$85.2B

Market Cap • 4/3/2025

1979

(46 years)

Founded

1984

(41 years ago)

IPO

NYSE

Listing Exchange

Flag of IE

Dublin

Headquarters

S&P500 Participant

Index Composite • 2025