Taiwan's stock market dropped sharply as all three major institutional investor groups sold at once — bad news for local investors.

• The Taiwan index fell 589 points to close near 44,719.
• Foreign and mainland Chinese investors, local funds, and dealers all sold on the same day.
• Their combined selling came to about NT$70.8 billion, with foreign money the biggest chunk.
• Trading volume stayed heavy at roughly NT$848 billion, so the selling met plenty of activity.

Outlook: If big investors keep pulling money out, the index likely stays under pressure in the near term.