The KOSPI plunged by 8%: the fifth trading halt in a month and the evaporation of $360 billion — analyzing 5 reasons
South Korea's KOSPI stock index has again plunged more than 8% in a single trading session. This marks the fifth forced trading halt in the past month. Over 400 trillion won, equivalent to approximately $360 billion, has "evaporated" from the market. Shares of key giants Samsung and SK Hynix each lost about 9%.
What is happening in the Korean market cannot be called a normal correction. We are witnessing a systemic liquidity crisis and structural breakdown. The KOSPI index is moving in sharp swings of 8–10% per day, and this has become the norm. Recall: on June 8, the index crashed 8% in the first three minutes of trading, and on June 22–23, the decline reached 10% — the second worst day in KOSPI history. The trigger then was a proposal to introduce a tax on unrealized profits.
Five Fundamental Reasons for Extreme Volatility
Analysis shows that the current situation is the result of five key factors overlapping, each amplifying the others.
The first factor is market structure. The Korean market is sustained by retail investors, known here as "ants." Unlike institutions, they trade on the principle of quick entry and even quicker exit. Any dip instantly turns into a panic crash, and any bounce into a sharp spike.
The second factor is dangerous concentration. Samsung and SK Hynix together account for 45–50% of the entire KOSPI index capitalization. For comparison, Nvidia and Apple together account for only 14% of the S&P 500. In effect, two stocks control an entire country's index. Their 9% drop automatically drags down half the market.
The third factor is record margin debt. It has reached 32.67 trillion won ($22.4 billion), up 25% year-over-year. Leveraged ETFs on individual Samsung and SK Hynix shares, approved in May, double the daily movement: a 9% decline turns into an 18% loss for holders, triggering a cascade of forced selling.
The fourth factor is the currency's status. The Korean won (KRW) is classified as a "local" currency and is not used in global reserves. Therefore, selling by foreigners hits it particularly hard. The won has already fallen to a 17-year low, increasing import costs and limiting the Bank of Korea's ability to cut rates even amid the stock market crash.
The fifth factor is the National Pension Service of Korea (NPS). This fund holds assets equal to 60% of the country's GDP, but has already exceeded its limit on the share of stocks in its portfolio. As a result, it is forced to sell on every bounce instead of buying dips. The fund was even selling on the day the trading halt was triggered. In essence, the market has lost its main stabilizer.
Loss of the Bullish Catalyst
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.
As a result, we have a market that is retail-driven, concentrated on two stocks, overloaded with leverage, vulnerable in currency, lacking a stabilizer, and — now — without a bullish scenario. This is why KOSPI no longer moves by 2% — it fluctuates by 8–10% almost every day. Between crashes, the market bounces just as sharply: in March, it rose nearly 10% in one day immediately after a record 12% drop.
My comment as an analyst: The Korean market has fallen into a classic "liquidity trap," exacerbated by structural imbalances. Until a new powerful catalyst emerges (e.g., the return of foreign capital or a pension fund rebalancing), we will continue to see these "wild" fluctuations. Investors should prepare for 8-10% daily volatility to become the new normal for KOSPI in the coming months.