South Korea's KOSPI index suffered a catastrophic collapse on Thursday, plunging 8.4% from its all-time high of 8,046 points reached just days earlier. The sell-off erased approximately ₩509 trillion (US$380 billion) in market capitalization, marking one of the largest single-day wealth destructions in the country's financial history.
The crash was triggered by a combination of extreme overbought conditions, aggressive profit-taking after a prolonged rally, and renewed fears of an interest rate hike by the Bank of Korea. Geopolitical tensions and rumors of a massive institutional liquidation further fueled panic, triggering a cascade of margin calls and automated stop-loss orders. The index, which had surged over 70% this year, quickly fell to 7,585 as both foreign and local investors rushed for the exits.
Technology heavyweights bore the brunt of the selling. Samsung, recently valued at over $1 trillion, and SK Hynix saw sharp declines, with the tech sub-index suffering more than $2.5 billion in outflows. Exchange-traded funds tracking Korean equities also bled assets, with the iShares MSCI South Korea ETF losing $1.2 billion over three weeks.
Regulators are closely monitoring the situation and may consider market-stabilizing measures, including temporary short-selling bans or expanded circuit breakers. The Bank of Korea has indicated readiness to inject liquidity. Analysts warn that the KOSPI remains overvalued by historical standards, with a price-to-earnings ratio of 30 versus the S&P 500's 22, and technical indicators suggest further downside risk, potentially toward the 5,000 level.
