Revenues for the last part of the year will be adversely affected by an about one per cent drop in wafer ASPs and capacity at its plants will slide to 81-83 per cent in the fourth quarter from 89% in the third.

UMC's had already lowered capacity in the third quarter. At the beginning of the year it was running at 94 percent.

The company's revenues decreased 7.1 per cent to $1.07 billion in the third quarter, with gross margin slipping below 20 per cent.

UMC net profits were down 62.9 per cent on quarter, as both operating and non-operating income eroded. This is bad news because in the first three quarters of 2015, UMC's net profits increased 35.8 per cent from a year earlier.

However UMC is continuing to invest in new capital and will spend $1.8 billion.

CEO Po-Wen Yen said that the continuing IC inventory adjustment will dampen fourth quarter wafer shipments, but UMC continues on the path towards long-term growth.

"Throughout 2015, UMC engineers and Fab12A have worked tirelessly to bring several new 28nm product tape-outs into volume production. "UMC is working to bring a timely conversion of new 28nm requirements into production, which will strengthen our business."