ULTRA CLEAN HOLDINGS INC revenue for the last year amounted to 2.03 B EUR, the most of which — 1.79 B EUR — came from its highest performing source at the moment, Critical Subsystems, the year earlier bringing 1.36 B EUR. The greatest contribution to the revenue figure was made by Singapore — last year it brought ULTRA CLEAN HOLDINGS INC 687.29 M EUR, and the year before that — 551.49 M EUR.