South Korea stocks plunge 8%, circuit breaker triggered as chip shares tumble

South Korea's benchmark stock index fell roughly 8% in a single session, triggering a circuit breaker that temporarily halted trading, with semiconductor shares leading the decline. The transmission channel runs through the outsized weight of memory-chip and related technology names in the Kospi, meaning a sector-specific sell-off translates directly into index-level losses and forces a rapid repricing of the country's equity risk premium. Foreign investors, who hold a large share of Korean large caps, are typically the marginal sellers in episodes like this, so capital outflows and currency pressure on the won are likely secondary exposures. Global memory and chip-equipment names, along with Korean export-sensitive sectors and the won against the dollar, warrant close attention for spillover. Traders should watch the reopening price action and any official response from Korean regulators or the central bank, alongside next-day foreign net flow data and export figures for the coming weeks.

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