![]() Aon UK Aon UK is a professional services company that specializes in risk, health, and wealth solutions. | ![]() Aon Enterprise Solutions Shanghai Aon Enterprise Solutions Shanghai (怡安企业服务(上海)有限公司) is a company that specializes in risk, health, and human capital solutions. | Aon Aon is a company specializing in risk management, insurance brokerage, and human capital consulting. | ![]() Mercer UK Mercer UK (also known as MMC UK Group) is a consulting company specializing in talent, health, retirement, and investments. | ||
Founding Date | Founding Date 1925 | Founding Date 1994 | Founding Date 1982 | Founding Date 1999 | Founding Date 1995 |
Type | Type Subsidiary | Type Subsidiary | Type Public | Type Subsidiary | Type Private |
Tags | |||||
Locations | Locations London, GB HQ Guernsey, GG Douglas, IM Aberdeen, GB Belfast, GB Birmingham, GB Bristol, GB see more | Locations Shanghai, CN HQ | Locations London, GB HQ Belas, AO Buenos Aires, AR Buenos Aires, AR Córdoba, AR Mar Del Plata, AR Neuquén, AR see more | Locations London, GB HQ Belfast, GB Birmingham, GB Bournemouth, GB Bristol, GB Chichester, GB Edinburgh, GB see more | Locations Lisboa, PT HQ |
Employees | Employees 4,3672% decrease | Employees N/A | Employees 60,000 | Employees 11,623 | Employees 7 |
Financial | |||||
Revenue (est.) | Revenue (est.) N/A | Revenue (est.) N/A | Revenue (est.) $17.2b (FY, 2025) | Revenue (est.) £390.2m (FY, 2022) | Revenue (est.) N/A |
Net income | Net income N/A | Net income N/A | Net income $3.8b (FY, 2025) | Net income £358.4m (FY, 2022) | Net income N/A |
Operating ⚠ | |||||
Countries | Countries N/A | Countries N/A | Countries 120 (FY, 2022) | Countries 130 (Feb, 2024) | Countries N/A |

Aon Enterprise Solutions Shanghai (怡安企业服务(上海)有限公司) is a company that specializes in risk, health, and human capital solutions.
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Mercer UK (also known as MMC UK Group) is a consulting company specializing in talent, health, retirement, and investments.
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