Winbond's stock opened higher but ended the day in the red, a bad turn for its 550,000 shareholders even as the wider Taiwan market rallied.

• Taiwan stocks jumped after Nvidia's strong earnings lifted US indices, with the index closing up 356 points.
• Winbond went the other way, opening near 192 and falling to close around 181.5 as trading volume swelled.
• The three major institutional investor groups sold 38,700 lots of the stock in a single session, driving the reversal.
• Winbond topped the list of investment trusts' biggest sells, ahead of banks and financial names like Mega Financial and Hua Nan Financial, and even TSMC.

Outlook: With big money still cutting exposure, Winbond looks likely to lag the broader Taiwan rally in the near term.