KOSPI recorded the steepest decline among major global stock markets over the recent one month, falling nearly 40% from the 8400 level at the end of last month to the 5200 range during intraday trading. KOSDAQ also dropped approximately 35% during the same period, ranking as the second-largest decline globally. The pronounced weakness stems from excessive concentration in semiconductor stocks, particularly Samsung Electronics and SK Hynix, compounded by supply-demand distortions caused by single-stock leveraged ETFs that trigger mechanical selling during downturns.
KOSPI and KOSDAQ Lead Global Market Declines
According to financial information platform Investing.com, KOSPI recorded the largest decline among major global stock markets over the recent one month. KOSDAQ posted the second-largest drop, giving Korean stocks the distinction of occupying the top two positions in the global decline rankings. KOSPI fell from the 8400 level at the end of last month to the 5200 range during intraday trading, marking a nearly 40% plunge. KOSDAQ declined approximately 35% during the same period.
This decline is more than double the 16.99% drop recorded by China's Shenzhen Component Index, which ranked third. Japan's Nikkei 225 and Taiwan's TAIEX fell only around 13% and 10%, respectively, over the recent one month.
Semiconductor Concentration Amplifies Index Volatility
Market participants attribute KOSPI's relative weakness to excessive concentration in the semiconductor sector. With Samsung Electronics and SK Hynix accounting for significantly elevated portions of total market capitalization, price movements in these two stocks cause KOSPI to fluctuate far more dramatically than other major markets. This structural issue has become entrenched in the index composition.
Leveraged ETFs Trigger Mechanical Selling Pressure
Single-stock leveraged exchange-traded funds (ETFs) based on Samsung Electronics and SK Hynix are identified as factors amplifying volatility. Leveraged ETFs conduct rebalancing to maintain tracking ratios, mechanically buying or selling underlying assets. When stock prices plunge, this mechanical selling generates additional downward pressure. Market observers widely view single-stock leveraged ETF flows as intensifying supply-demand distortions and magnifying KOSPI's decline beyond what fundamentals alone would justify.
Financial Industry Official Cites Sharpe Ratio Collapse
Experts indicate that KOSPI's recent sharp decline cannot be explained solely by external factors such as concerns over AI demand slowdown or semiconductor industry outlook. The analysis points to a vicious cycle where semiconductor concentration and supply-demand distortions centered on single-stock leveraged ETFs interact to produce cascading declines.
A financial investment industry official stated, "The Sharpe ratio, which measures returns relative to volatility, collapsed immediately after single-stock leveraged ETFs launched on the first day of last month. From the perspective of foreign investors, returns relative to volatility have become too low, leading to capital outflows. Given Korean stocks' volatility, domestic equities have become difficult assets to approach."
The official added, "The market is severely tangled due to the introduction of the flawed system of single-stock leveraged ETFs, so the tangled parts must first be resolved. These tangled parts need to be unwound either through bold government intervention or naturally as supply-demand issues dissipate, but naturally no one can know when that will happen."
FAQ
How much did KOSPI stocks fall over the recent one month?
KOSPI fell nearly 40% over the recent one month, dropping from the 8400 level at the end of last month to the 5200 range during intraday trading. This represents the steepest decline among major global stock markets during the same period.
Why did Korean stocks decline more than other Asian markets?
Market participants attribute the outsized decline to excessive concentration in semiconductor stocks, particularly Samsung Electronics and SK Hynix, combined with supply-demand distortions caused by single-stock leveraged ETFs. These ETFs conduct mechanical rebalancing that amplifies selling pressure during downturns, creating a structural vulnerability that magnifies volatility beyond what fundamentals alone would justify.
