NPK International Inc. revenue for the last year amounted to 749.60 M USD, the most of which — 541.95 M USD — came from its highest performing source at the moment, Fluids Systems, the year earlier bringing 622.60 M USD. The greatest contribution to the revenue figure was made by United States — last year it brought NPK International Inc. 409.50 M USD, and the year before that — 535.34 M USD.