Kospi Slides After US Rout, Triggering Circuit Breaker

The Korea Composite Stock Price Index (KOSPI) fell sharply at the open after a steep selloff in US equities, with the decline breaching the threshold that triggers a market-wide circuit breaker halting trading. The primary transmission channel is risk appetite, as overnight losses on Wall Street prompt global investors to reduce exposure to equities and higher-beta markets, while foreign institutional investors often pull capital from Korean stocks during periods of broad risk aversion. KOSPI is especially sensitive to this dynamic given the heavy weighting of export-oriented semiconductor and technology names, which track US tech valuations and global chip demand expectations. Traders should watch the won-dollar exchange rate and foreign net flows data for signs of whether capital outflows are accelerating, along with the US open and any follow-through in Nasdaq futures to gauge whether the selloff is stabilizing.

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