Taiwan Mask (TPE:2338) completed the disposal of its Zhunan plant and related equipment to Siliconware Precision Industries worth NT$2.8 billion, according to its filing on Wednesday.
Shares jumped over 5% in Thursday's midday trade.
The photomasks manufacturer expects to book a gain of about NT$1.824 billion from the transaction.
Taiwan Mask said the sale is aimed at asset optimization and focusing on core operations.