Ultra Clean Holdings, Inc. revenue for the last year amounted to 2.10 B USD, the most of which — 1.85 B USD — came from its highest performing source at the moment, Critical Subsystems, the year earlier bringing 1.50 B USD. The greatest contribution to the revenue figure was made by Singapore — last year it brought Ultra Clean Holdings, Inc. 711.50 M USD, and the year before that — 608.70 M USD.