ICON plc revenue for the last year amounted to 8.12 B USD, the most of which — 8.12 B USD — came from its highest performing source at the moment, Outsourced Development Services, the year earlier bringing 7.74 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought ICON plc 3.28 B USD, and the year before that — 3.57 B USD.