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.
South Korea's KOSPI stock index has once again experienced a shock decline, losing more than 8% in a single trading session. This marks the fifth forced trading halt in the past month — and the market, it seems, is losing its last stabilizing mechanisms. Since the start of the current crisis, over 400 trillion won (approximately $360 billion) has "evaporated" from the market.
Shares of two key issuers — Samsung and SK Hynix — each plunged by about 9%. These companies are not just heavyweights but essentially the "backbone" of the entire index: their combined weight in the KOSPI reaches 45–50%. For comparison, even Nvidia and Apple together account for only 14% of the U.S. S&P 500. Such high concentration makes the entire market a hostage to these two stocks, and any movement in them is instantly reflected across the entire index.
Five structural reasons for the current crash
First. The fundamental problem is the retail structure of investors. In Korea, they are called "ants" — individual traders who operate on the principle of quick entry and even quicker exit. They do not hold positions but trade on impulses, turning every dip into an avalanche of sales and every rebound into a sharp surge.
Second. Record margin debt, which has reached 32.67 trillion won ($22.4 billion), increasing by 25% over the year. Recently approved leveraged ETFs on individual stocks like Samsung and SK Hynix double the daily movement: a 9% drop turns into an 18% loss for holders, triggering forced sell-offs.
Third. The status of the Korean won (KRW) — it is considered a "local" currency and is not used in global reserves. Therefore, foreign investors sell it much more readily at the slightest sign of turbulence. 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 crash.
Fourth. Korea's National Pension Service (NPS) — the largest institutional player — holds assets equivalent to 60% of the country's GDP. However, the fund has exceeded its limit on the share of stocks in its portfolio and is now forced to sell on every rebound instead of buying the dips. It was even selling on the day the trading halt was triggered.
Fifth. At the end of June, Korea was not included in the MSCI watch list for an upgrade to developed market status. This deprived the market of its only bullish catalyst, for which foreign capital was willing to tolerate volatility.
A market without a stabilizer
In the end, we have a perfect storm: retail-driven, concentrated on two stocks, overloaded with leverage, vulnerable in currency, lacking a stabilizer, and left without a bullish scenario. The KOSPI is now fluctuating by 8–10% almost daily. 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: This dynamic resembles the behavior of a high-risk crypto asset rather than a developed economy's stock market. Until an external catalyst emerges — whether it be inclusion in MSCI, decisive action by the pension fund, or easing of currency pressure — we will continue to see these extreme fluctuations. Investors should prepare for the fact that daily volatility of 2–3% will remain the norm, and the risks of margin positions will multiply significantly.