ULTRA CLEAN HLDGS INC COM USD0.001 revenue for the last year amounted to 1.73 B USD, the most of which — 1.50 B USD — came from its highest performing source at the moment, Critical Subsystems, the year earlier bringing 2.07 B USD. The greatest contribution to the revenue figure was made by Singapore — last year it brought ULTRA CLEAN HLDGS INC COM USD0.001 608.70 M USD, and the year before that — 735.70 M USD.