Kospi: South Korean Stock Market Suspended for the 6th Time This Year, AI Bubble Wavers

A Suspension That Betrays Market Nervousness

The Kospi, South Korea's main stock index, has been suspended for the sixth time since the beginning of 2026. The previous interruptions occurred on March 4, March 9, June 8, June 26, July 7, and again this Monday. This unprecedented pace reflects the nervousness of a market that has become entirely dependent on two semiconductor giants, Samsung Electronics and SK Hynix.

The mechanism is simple. As soon as the index drops sharply, the stock exchange authorities activate a "circuit breaker" that freezes trading for several minutes, allowing panic to subside.

However, the index has been setting records in recent months. The Kospi reached an all-time high of 8,880 points, after a 220% increase over twelve months. SK Hynix saw its stock price soar by 1,000% over the year, while Samsung's rose by 500%. Both companies have crossed the symbolic threshold of $1 trillion in market capitalization.

According to KB Securities, Samsung and SK Hynix contributed 70% to the Kospi's growth in 2026, a concentration deemed "unprecedented." This poses a risk to the market, which is now dependent on the health of these two major players.

Over-Indebted Households Riding the AI Wave

But another element worries analysts even more. Individual Korean investors are borrowing at a record pace to buy stocks. Margin loans reached 36.47 trillion won this year, double that of twelve months ago.

The phenomenon has reached staggering proportions. The country now has 102 million active trading accounts, for only 52 million inhabitants. In other words, each Korean has an average of two brokerage accounts, illustrating the extent of the speculative fever.

Faced with brokerage rates nearing 10%, individuals have turned to bank credit lines. In May alone, bank loans to households surged by 9.3 trillion won, the largest monthly increase since August 2024, with a direct correlation to stock market investments according to the Bank of Korea.

The five largest commercial banks in the country have already consumed more than 85% of their annual credit limits for households in just the first half of the year. A severe "lending cliff" looms for the second half.

Extreme Volatility and Alarm Signals

Stress indicators are multiplying. The Korean VIX, which measures anticipated volatility, has reached 75, while it historically hovers around 20. Rarely, this peak occurs even as the market rises, a sign that investors are buying out of fear of missing out.

Traditionally, such high volatility accompanies crashes, not rallies. When it explodes during a rise, it reflects extreme nervousness, where every movement, both up and down, takes on exaggerated proportions. This is what triggers repeated trading suspensions.

The ratio of household debt to income peaks at 174%, and 44% of borrowers have reportedly missed at least one payment in the past six months. An increase in the Bank of Korea's rate is expected next month, which would mechanically raise the cost of all ongoing margin loans.

This dynamic raises concerns well beyond Seoul. South Korea has become the sixth-largest stock market in the world, ahead of the United Kingdom, Germany, and France. A sudden reversal would have repercussions across the entire AI theme, including on Nvidia (NVDA), whose market capitalization now exceeds $5.1 trillion.

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