South Korea Stock Volatility Hits Highest Since 1998, Down 28% in Recent Rally Reversal

South Korea's stock market has experienced its most severe volatility since the 1998 Asian financial crisis, with the 60-day price swings of the MSCI South Korea Index reaching their highest level in over 28 years. The benchmark index has fallen 28% from June highs, with a 10% plunge in early July, while triggering seven trading halts so far in 2026—exceeding the total number of circuit breakers activated in the past 25 years combined.

The extreme swings stem largely from concentrated portfolio weights: semiconductor giants Samsung Electronics and SK Hynix account for approximately two-thirds of the MSCI South Korea Index. High leverage and single-stock exchange-traded funds have amplified price volatility. Individual investor sentiment has cooled significantly, with net buying in the first ten days of July falling 42.4% compared to the previous month, signaling diminished confidence in the sustainability of AI-driven gains that had propelled the index up over 250% in the preceding 12 months.