TSMC's net sales for January 2013 were approximately NT$47.44 billion, an increase of 27.7 percent from December 2012 and an increase of 37.1 percent over January 2012.

TSMC did not give any reason for the sales jump.

Taiwanese foundry United Microelectronics Corp. also reported January sales of NT$9.45 billion (about $320 million) up 21.2 percent sequentially and up 6.9 percent on the sales the same month a year before.