Taiwan's memory-chip maker Nanya Technology took a heavy hit as large investors sold in force, a painful day for its 300,000 shareholders.

• Nanya's stock fell almost 8% on huge trading volume after institutions dumped tens of thousands of lots.
• Foreign investors, local funds, and brokers all sold at once — a rare united exit.
• The wider Taiwan market swung from a 353-point gain to a 307-point loss as chip and display stocks turned down.
• Foreign money kept flowing out of Taiwan overall, with other memory names like Winbond, Powerchip, and Macronix also heavily sold.

Outlook: Memory-chip stocks look shaky in the near term while foreign investors keep selling.