Taiwan's stock market opened strong and then flipped to a loss, a bad day for investors who bought the morning rally.

• The index jumped over 350 points at the open, led by memory, satellite, AI and optical chip stocks.
• Selling then hit semiconductor, chip design and ABF substrate makers, dragging the index below 46,000 and into the red.
• The swing from top to bottom was more than 500 points in a single session.
• The morning strength came from Wall Street, where all major US indices bounced back on Wednesday after three days of losses.
• Traditional industry and financial stocks briefly helped the rally before they pulled back too.

Outlook: Expect more choppy trading in Taiwan as bargain hunters and nervous sellers fight over chip stocks.