South Korea's benchmark KOSPI 200 index plunged 8.7% on March 4, 2026, marking its steepest single-day drop in history, as escalating Middle East conflict fears triggered a global risk-off shift. Energy and defense stocks rallied amid heightened geopolitical uncertainty.
- KOSPI 200 (KS11) dropped 8.7% on March 4, 2026, its largest single-day decline ever.
- Crude oil (CL=F) rose 6.2% to $89.30 per barrel amid supply risk concerns.
- Energy ETF (XLE) gained 5.8% on heightened demand for commodity exposure.
- Defense sector stocks rose an average of 7.3%, with select firms surging over 12%.
- Gold futures climbed 3.5% to $2,345 per ounce, reflecting safe-haven flows.
- Global equity markets saw broad declines, with MSCI Asia-Pacific down 4.1%.
South Korea's equity markets plunged to their lowest level in over a decade as the KOSPI 200 Index (KS11) fell 8.7% on March 4, 2026, recording its largest single-day decline on record. The selloff followed a sharp escalation in hostilities in the Middle East, spurring a flight to safety across global financial markets. Trading volumes surged 45% above average, with institutional investors rapidly unwinding positions in technology and consumer discretionary sectors. The move reflects growing market anxiety over potential disruptions to global energy supplies and supply chain stability. Crude oil futures (CL=F) rose 6.2% to $89.30 per barrel, as traders priced in the risk of supply constraints from key Gulf producers. The energy sector’s performance was mirrored in the energy ETF (XLE), which climbed 5.8% on the day, driven by increased demand for commodity hedges. Defense-related equities also saw strong momentum, with defense contractors in South Korea and the U.S. gaining an average of 7.3%. The rally came amid speculation that regional security alliances may be reinforced in response to the Middle East crisis. Companies linked to missile defense systems and surveillance technology reported the highest intraday gains, with some shares rising over 12%. Global equity indices reacted in kind, with the MSCI Asia-Pacific Index shedding 4.1%, while gold futures surged 3.5% to $2,345 per ounce, signaling continued safe-haven demand. The events underscore how geopolitical flashpoints can rapidly reconfigure risk perceptions and asset allocations in just a single trading session.