GCS HOLDINGS INC revenue for the last year amounted to 1.75 B TWD, the most of which — 1.71 B TWD — came from its highest performing source at the moment, Compound Semiconductor Wafer Manufacturing Foundry. The greatest contribution to the revenue figure was made by China — last year it brought GCS HOLDINGS INC 1.11 B TWD, and the year before that — 554.02 M TWD.