Marsh & McLennan Companies, Inc. revenue for the last year amounted to 22.57 B USD, the most of which — 14.08 B USD — came from its highest performing source at the moment, Risk and Insurance Services, the year earlier bringing 12.64 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought Marsh & McLennan Companies, Inc. 10.92 B USD, and the year before that — 10.21 B USD.