Aon, first world non-life broker, before Marsh and Willis

According to a ranking made by Finaccord on the 2013's turnover basis, the British group Aon leads non-life brokers with 6.1 billion USD.

Marsh took the second rank with a turnover of 5.1 billion USD. Willis took the third place with 2.05 billion USD.
Willis shall count on the purchase of the French Gras Savoye (currently ranked 10^th with 464.7 million USD), likely planned in 2016, to slightly make up its backwardness.

Note that in terms of number of companies, United States are leader of the ranking with 67 companies out of 150, followed by United Kingdom (24) and France (12).