KELLER GROUP PLC revenue for the last year amounted to 3.61 B EUR, the most of which — 3.42 B EUR — came from its highest performing source at the moment, Specialist Geotechnical Services, the year earlier bringing 3.33 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought KELLER GROUP PLC 1.90 B EUR, and the year before that — 1.99 B EUR.