Shareholders of Powertech Technology (PTI), a Taiwan-based memory backend specialist, have approved a private placement plan to raise additional capital at a provisional meeting on January 15. The plan is to introduce China's state-owned Tsinghua Unigroup as the largest shareholder of the company.

Tsinghua Unigroup has agreed to subscribe to new shares of PTI, which will be priced at NT$75 (US$2.23) per unit, for a 25% stake in the Taiwan-based company.

Tsinghua Unigroup's planned investment in PTI still requires approval by related regulatory agencies, such as Taiwan's Investment Commission.

Tsinghua Unigroup has also disclosed plans to invest in two other Taiwan-based packaging and testing companies including ChipMOS Technologies Taiwan and Siliconware Precision Industries (SPIL).