Aon provides health insurance, voluntary benefits and other services for all sizes of employers . A comprehensive employee benefits plan is a important part of a payment package for employers. Aon has an M Score of 5, which is the highest M Score possible based on wide experience with business clients and positive customer feedback. Aon has been providing risk management, insurance and reinsurance brokerage, human resources solutions, retirement services, investment products, and wealth management advice for more than 50 years.