MediaTek (TPE:2454) unit Digimoc acquired 3.22 million preferred shares in Reed Semiconductor for about $29 million, according to a Friday Taiwan Exchange filing.
Shares gained about 2% in Monday's late morning trade.
The shares were purchased at an average price of about $8.99 per share, giving Digimoc an approximately 4.1% stake in Reed Semiconductor.
The company made the purchase as a financial investment, it said.