The KOSPI index crashed by 8%: five structural causes of the crisis and the evaporation of $360 billion
The South Korean stock market is experiencing one of the most dramatic periods in its history. The KOSPI index has once again plunged more than 8% in a single trading session, marking the fifth forced trading halt in the past month. Over 400 trillion won (approximately $360 billion) has evaporated from the market, with shares of flagship companies Samsung and SK Hynix each losing about 9%.
This decline is not a coincidence, but a natural outcome of accumulated imbalances. Earlier, on June 8, the index collapsed by 8% within the first three minutes, and on June 22-23, the drop reached 10% — the second worst day in KOSPI history amid rumors of a tax on unrealized profits.
Five factors destroying the market
1. Retail structure. A key feature of the Korean market is the dominance of retail investors, known here as "ants." They operate on the principle of quick entry and even quicker exit, turning every dip into a crash and every rebound into a sharp spike.
2. Excessive concentration. Samsung and SK Hynix together account for 45-50% of the entire KOSPI index weight. For comparison, Nvidia and Apple make up only 14% of the S&P 500. Effectively, two stocks control the market of an entire country.
3. Record margin debt. It has reached 32.67 trillion won ($22.4 billion), increasing by 25% year-over-year. Leveraged ETFs on individual stocks of Samsung and SK Hynix, approved in May, double daily movements: a 9% drop turns into an 18% loss for holders, triggering forced sell-offs.
4. Weakness of the won (KRW). The Korean currency is not part of global reserves, so foreign sales hit it harder. The won has already fallen to a 17-year low, raising import costs and limiting the Bank of Korea's ability to cut rates even amid the stock market crash.
5. Pension fund dysfunction. The National Pension Service of Korea (NPS) holds assets equal to 60% of the country's GDP, but has already exceeded the limit on the share of stocks in its portfolio. As a result, the fund is forced to sell on every rebound instead of buying dips. It was even selling on the day the trading halt was triggered.
Loss of stabilizer and bullish scenario
An additional blow came at the end of June when Korea was not included in the MSCI watch list for an upgrade to developed market status. This deprived the market of the only catalyst for which foreign capital was willing to tolerate volatility.
In the end, we have a market that is retail-driven, concentrated on two stocks, overloaded with leverage, vulnerable in currency, lacking stabilizers, and without a bullish scenario. This is why the index no longer moves by 2% — it now fluctuates by 8-10% almost every day. Between crashes, the market rebounds just as sharply: in March, it rose nearly 10% in a single day right after a record 12% drop.
My analysis: The Korean market has fallen into the classic trap of structural fragility described by Nassim Taleb. A system dominated by retail investors with leverage, where two issuers control the entire index, is doomed to extreme movements. Until a powerful external catalyst emerges (e.g., inclusion in MSCI Developed Markets or a sharp weakening of the won), we will continue to see this "roller coaster." Investors should be prepared for daily movements of 10% or more — this is the new normal for KOSPI.