Taiwan stocks slide as US–Iran ceasefire expires and chip shares tumble

Aug 18, 2026

Stocks fell across Taiwan and the US after the US–Iran ceasefire ran out, which is bad news for investors and anyone worried about inflation.

  • The ceasefire expired with no progress on reopening the Strait of Hormuz, a key oil shipping route.
  • Oil stayed expensive and government bond yields hit multi-year highs, stoking inflation fears.
  • All four main US indices closed lower, with the chip index down about 5%.
  • Taiwan's market touched 46,000 early, then reversed and closed down over 500 points, an 800-point swing on light volume.
  • Traders see the pullback as normal, with the key floor around 44,800.

Outlook: Tomorrow's futures settlement in Taiwan will test whether that support holds, and oil will stay the main driver until the Hormuz standoff eases.

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