South Korea's benchmark Kospi index tumbled 4.2% on March 3, 2026, marking its steepest single-day decline in 19 months as Iran's Revolutionary Guard declared the closure of the Strait of Hormuz. The move triggered a regional market rout, with Asian equities broadly under pressure and global oil benchmarks surging.
- Kospi dropped 4.2% on March 3, 2026, its worst day in 19 months
- Brent crude rose 6.8% to $98.40 per barrel after Iran declared Strait of Hormuz closure
- U.S. crude (CL=F) surged 7.1% to $94.10
- VIX index spiked to 34.5, indicating heightened market fear
- Nikkei 225 fell 3.1%, Shanghai Composite dropped 2.7%
- Hanwha Group (000880.KS) rose 12.3% on defense sector speculation
South Korea's Kospi index plunged 4.2% on March 3, 2026, its worst single-day performance since June 2024, as panic spread across Asian markets following Iran’s Revolutionary Guard announcement that it had closed the Strait of Hormuz. The strategic waterway, through which nearly 20% of global oil shipments pass, became a flashpoint after Iran declared control of the route, raising fears of a major supply disruption. Global oil markets reacted sharply, with Brent crude futures climbing 6.8% to $98.40 per barrel, while U.S. crude (CL=F) rose 7.1% to $94.10. The spike in energy prices sent shockwaves through equity markets, with the VIX index (^VIX) surging to 34.5, its highest level since late 2023, signaling heightened risk aversion. The sell-off extended beyond Korea, as Japan’s Nikkei 225 fell 3.1%, and China’s Shanghai Composite dropped 2.7%. Defense and energy stocks saw immediate gains, with Korea’s Hanwha Group (000880.KS) surging 12.3% on speculation of increased military spending. Meanwhile, global equity futures reflected deepening concern: the S&P 500 futures (ES=F) declined 1.9%, and the EU’s STOXX 600 dropped 2.5%. The broader Asian equity sell-off was driven by fears that a prolonged closure of the Strait could push global oil prices toward $120 per barrel, threatening inflation and economic growth across the region. Market participants are now closely monitoring diplomatic developments and the response from the U.S. and allied navies. The U.S. Seventh Fleet has reportedly begun positioning assets in the region, while the European Union has issued a call for de-escalation. The immediate impact is a sharp rise in hedging costs and a flight to safe-haven assets, with gold prices rising 2.3% and the Japanese yen strengthening 1.8% against the dollar. Analysts warn that sustained volatility in energy markets could trigger a broader reassessment of corporate earnings forecasts, particularly for exporters and energy-intensive industries.