ProMOS Technologies was originally scheduled to determine a buyer for its 12-inch fab located in Taichung, central Taiwan, in an open bid held today (November 29). However, as bidders failed to pay the required deposit, the auction has been postponed to December 12, according to ProMOS.

ProMOS previously unveiled plans to sell its 12-inch wafer plant and related facilities through open bidding by the end of 2012, in a move to become a fabless memory-IC company.

Analog and mixed-signal IC foundry Vanguard International Semiconductor (VIS) is reportedly the most likely buyer of the 12-inch plant.