South Korea's KOSPI index suffered a historic intraday plunge of approximately 910 points [1] on Tuesday, July 28, 2026.

This sudden collapse represents a significant shock to one of Asia's largest equity markets. The scale of the sell-off suggests a period of intense instability that could impact regional investor confidence and broader economic sentiment.

The index fell by 9.99% [1] during the trading session. This sharp decline triggered a circuit-breaker, a regulatory mechanism designed to halt trading and prevent a total market panic when a specific threshold, in this case, a 10% drop, is reached [1].

Extreme market volatility drove the massive sell-off at the Korea Exchange in Seoul [1]. Despite the severity of the intraday crash, the KOSPI remained above the 6,000 level [2].

While some reports indicated the index barely held the 6,000 line, the KOSPI ultimately closed at 8,203 points [1]. This closing figure suggests that while the volatility was historic, the index maintained a significant cushion above the 6,000 mark by the end of the day [2].

The event has been described by some as a "Black Tuesday" due to the unprecedented nature of the point drop [2]. The suddenness of the 910-point slide [1] forced the exchange to implement emergency stability measures to manage the volume of trades.

“The index suffered a historic intraday plunge of about 910 points”

The activation of a circuit-breaker indicates a level of volatility that exceeds normal market corrections. While the index closed well above 6,000, the intraday swing of nearly 10% reveals a high level of fragility in investor sentiment. The gap between the intraday low and the closing price suggests a volatile recovery, but the event underscores the risk of rapid capital flight in the South Korean market.