The Grieg Group owns 20 per cent of Aon Grieg.

Aon Grieg is Norway's largest insurance broker, with a market share of 30 per cent. The company was established as Duo Insurance Brokers in 1874 – primarily offering services to the marine industry. The company was bought by Rollins Hudig Hall in 1993, and the name changed to Aon Norway in 1996. Grieg Insurance (established 1975) was acquired in 1998, when the name was changed again.

Today Aon Grieg provides solutions for a wide variety of clients: Shipping, the oil industry, all business and industry segments, towns, municipalities, museums, galleries and many different organizations. Services include risk management consulting, insurance and reinsurance brokerage as well as pension and other HR-related consulting services. Aon Grieg's total operating revenue (2006) was NOK 210 million (26,3 million Euros). Aon Grieg has approximately 200 employees.