Nan Ya Plastics stock jumped in Taipei trading on hopes that August sales hit a four-year high, a strong signal for the maker and its investors.

• The stock rose to around NT$236 with heavy volume, holding up even as the wider Taiwan market opened weak.
• July sales were up 45% from a year earlier, and profit exploded, sending the shares sharply higher the next day.
• Demand for its high-end products, especially copper-clad boards used in advanced electronics, is driving the turnaround.
• Big banks have piled in with much higher price targets, with the most bullish nearly double the current price.
• Local funds were heavy buyers while foreign investors sold, and many institutions got in far cheaper — a warning for anyone chasing the stock now.

Outlook: The full August revenue figure lands this afternoon and will decide whether the rally keeps running or stalls.