South Korea's benchmark Kospi index dropped 8.7% in a single session on March 4, 2026, marking its steepest one-day decline in history, as escalating Middle East conflict fears triggered a regional equity sell-off. The USD/KRW exchange rate surged to 1,412.30, reflecting heightened risk aversion and a flight to safety.
- KS11 dropped 8.7% on March 4, 2026—the largest single-day decline in its history.
- Crude oil (CL=F) rose 6.2% to $98.40 per barrel amid Middle East conflict fears.
- USD/KRW reached 1,412.30, its highest level since early 2023.
- VIX surged 34% to 29.8, reflecting heightened market volatility.
- Foreign outflows from Korean equities totaled $2.1 billion in one day.
- Financial and materials sectors fell 9.5% and 11.3%, respectively.
South Korea's financial markets experienced unprecedented turbulence on March 4, 2026, as geopolitical tensions in the Middle East sparked a dramatic selloff across Asian equities. The Korea Composite Stock Price Index (KS11) plunged 8.7%—the largest single-day drop in its history—dragging down regional markets and triggering a broad-based risk-off reaction. Trading volumes surged on the Korea Exchange, with investor sentiment shifting rapidly from optimism to panic amid fears of supply chain disruptions and rising oil prices. The sell-off was amplified by sharp moves in commodity markets, particularly crude oil, where the Brent crude futures (CL=F) climbed 6.2% to $98.40 per barrel, reflecting fears of potential supply shocks from the Middle East. This surge in energy prices intensified inflation concerns and pressured global equity valuations, especially in export-dependent economies like South Korea. The volatility index (VIX) rose 34% to 29.8, signaling extreme market stress and declining confidence in risk assets. The dollar gained strength across the region, with the USD/KRW exchange rate reaching 1,412.30—its highest level since 2023—driven by capital flight from emerging markets and demand for safe-haven currencies. Financial institutions in Seoul reported a significant spike in foreign investor outflows, with outbound positions in Korean equities totaling $2.1 billion in a single day. The sell-off also impacted financial and materials sectors, which saw their respective indices decline by 9.5% and 11.3%. The broad-based nature of the selloff highlighted the fragility of global markets in the face of geopolitical shocks. Asian markets outside Korea, including Japan’s Nikkei 225 and China’s CSI 300, also fell by between 3.1% and 4.6%, as investors reassessed risk exposure. Central banks in the region remained on standby, with the Bank of Korea signaling readiness to intervene if currency volatility exceeded thresholds.