Taiwan's Powerchip is getting hammered by foreign selling, which is bad news for its 670,000 small shareholders.

• Foreign investors sold Powerchip shares every day this week, unloading more than 187,000 lots.
• The stock fell from about 78 to 67 Taiwan dollars, a drop of around 14%.
• Powerchip topped Thursday's foreign selling list, ahead of financial and electronics names like Taishin, Walsin Technology and AUO.
• The broader Taiwan market still finished up, helped by memory stocks and a late push from TSMC, even after swinging from a 400-point gain to a loss during the day.
• Foreign investors were net buyers of Taiwan stocks overall, so the selling was aimed at specific names rather than the whole market.

Outlook: Powerchip likely stays under pressure while foreign money keeps heading for the exit, even if the wider Taiwan market holds up.