The KOSPI plunged by 8%: The fifth trading halt in a month and a loss of $360 billion — an in-depth analysis of the causes
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, equivalent to $360 billion, has effectively "evaporated" from the market.
Key blue-chip stocks, such as Samsung and SK Hynix, each lost about 9% of their market capitalization. This crash is not an isolated incident but a continuation of a worrying trend: on June 8, the index collapsed by 8% within the first three minutes, and on June 22-23, the decline reached 10% — the second worst day in KOSPI history, triggered by rumors of a tax on unrealized profits.
Five Fundamental Reasons for Extreme Volatility
My analysis shows that the current situation is the result of several structural problems overlapping, turning the Korean market into a "powder keg."
The first reason is the retail market structure. In Korea, so-called "ants" — retail investors who operate on the principle of quick entry and even quicker exit — dominate. Unlike institutional players, they turn every dip into a panic crash and every rebound into a sharp spike. This creates an extremely unstable environment.
The second reason is dangerous concentration. Just two companies — Samsung and SK Hynix — account for 45-50% of the entire KOSPI index weight. For comparison, in the S&P 500, the combined share of Nvidia and Apple is only 14%. Essentially, the fate of an entire economy depends on the performance of two stocks, making the market highly vulnerable to sector-specific shocks.
The third reason is record margin debt. It has reached 32.67 trillion won ($22.4 billion), increasing by 25% over the year. Particularly dangerous are the leveraged ETFs on individual stocks of Samsung and SK Hynix, approved in May. They double daily movements: a 9% drop turns into an 18% loss for holders, triggering a cascade of forced sell-offs.
The fourth reason is the vulnerability of the Korean won (KRW). The won is not among the world's reserve currencies, so foreign sales hit it with double force. The exchange rate 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 reason is the paradoxical behavior of the National Pension Service (NPS). This fund manages 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, instead of buying dips and stabilizing the market, it is forced to sell on every rebound. Data shows that NPS was selling even on the day the trading halt was triggered.
Loss of the Last Bullish Scenario
The final blow came from MSCI's decision in late June not to include Korea on the 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 perfect storm: retail-driven, concentrated on two stocks, overloaded with leverage, vulnerable in currency, lacking stabilizers, and without any bullish narrative. The index now fluctuates by 8-10% almost daily, making sharp rebounds between crashes.
My expert opinion: The current situation on KOSPI is a classic example of a "liquidity trap" in a structurally weak market. Until the retail structure changes and a new powerful catalyst emerges, such 8-10% movements will become the new norm. Investors considering Korean assets should factor extreme volatility into their risk models.