ASE Technology's (TPE:3711) unit Siliconware Precision Industries acquired NT$1.01 billion worth of machinery and equipment, according to a Friday Taiwan Exchange filing.
Shares of the semiconductor packaging and testing company slid nearly 3% in Monday's midday trade.
The purchases, comprising 10 batches, were made from Super Plus Technology between June 17 and July 17.
The acquisition is intended to support the company's business operations.