South Korean Market Volatility Soars Amid Leveraged AI Bets

An unprecedented wave of leveraged speculation in artificial intelligence stocks has transformed South Korea's stock market, once a dependable barometer for global economic health, into a highly volatile arena detached from its fundamental drivers. Billions of dollars in borrowed funds targeting AI darlings have warped the benchmark KOSPI index, confounding investors and regulators alike.

A Market Decoupled from Fundamentals

The extreme price swings have severed the KOSPI's traditional link to economic indicators, a relationship that strategists historically relied upon. "The index has decoupled from all of Korea’s historical drivers," said Alexander Redman, chief equity strategist at CLSA, in a comment to Reuters. This new volatility is evidenced by the fact that more than half of all stock market circuit breakers in the KOSPI's history have been triggered in the past six months alone.

The primary drivers are now massive capital flows into leveraged funds targeting a concentrated number of stocks, chiefly chipmakers Samsung Electronics and SK Hynix. These two companies, major beneficiaries of the global AI boom, now represent more than half of the KOSPI's value. Despite the rally, price-to-earnings ratios for both firms have fallen below 5, suggesting market prices are not reflecting future earnings potential.

Fueled by Leveraged Funds

The speculative frenzy is fueled by a mountain of borrowed cash. South Korean retail investors held 34.37 trillion won ($23 billion) in margin loans this week, according to the source. These bets are channeled through highly concentrated instruments, particularly single-stock exchange-traded funds (ETFs) that offer amplified returns.

Key figures highlight the scale of this trend:

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• Assets in a Hong Kong-listed twice-levered SK Hynix fund have surged more than 20-fold this year to $7.78 billion.
• This makes it the largest fund of its kind globally, with rebalancing flows substantial enough to influence the entire market.

"When the assets under management are ballooning, we see the limits of the exercise of giving leverage on single names — this is sending some warning signals for us," said Florian Neto, head of investment for Asia at Amundi.

Regulatory Response and Market Outlook

In response to the escalating volatility, South Korean regulators are taking steps to cool the market without triggering a panic. This week, authorities moved to block the launch of new single-stock leveraged funds. Furthermore, starting August 5, the minimum cash balance required to trade these ETFs will be tripled to 30 million won ($20,300).

Analysts see the measures as a necessary step toward stability. "Measures to restore a focus on fundamentals can only be welcomed... a return to rationality will be positive for long-term investors, in our view," said Mike Sell, head of global emerging market equities at Alquity. Still, the immense investor appetite has had tangible benefits, helping SK Hynix raise $26.5 billion last week in the largest-ever U.S. capital raise by a foreign company.

For global investors, the situation in South Korea serves as a critical case study on the impact of speculative capital in the AI era. "The bull case is that earnings growth continues, the leverage wins out, and Korean equities fly," noted Damien Boey, a portfolio strategist at Wilson Asset Management. "I don’t think that the market action is telling you that the story is that simple."