Taiwan's TAIEX plunged nearly 1,000 points at the Aug. 19 open after a sharp Wall Street sell-off, touching 44,308.71 before closing down 589.33 points at 44,719.35. The index breached its quarterly moving-average support as turnover fell to NT$847.9 billion, or about $26.6 billion. Foreign and mainland Chinese investors, investment trusts and proprietary traders recorded combined net selling of NT$70.85 billion, with investment trusts joining the sell side unusually. Largan Precision rose 4.91% to NT$5,550, supported by improving shipment expectations, the iPhone 18 cycle and its co-packaged optics venture, while the Yuanta Taiwan Top 50 Inverse ETF gained 1.28%, reflecting elevated hedging demand. Most heavyweight technology stocks fell, although thermal-management shares including Auras Technology and Jentech Precision advanced. ETFs accounted for seven of the 10 most actively traded securities, underscoring investors' use of leveraged and inverse products for short-term positioning and hedging.