By Elsie Kamsiyochi
South Korea’s stock market endured one of its most dramatic trading sessions in recent years on Tuesday, with the benchmark KOSPI index plunging almost 10% as investors rushed to exit technology stocks following regulatory concerns about excessive speculation in the sector.
The KOSPI closed down 910.71 points, or 9.99%, at 8,203.84, marking its steepest one-day decline since early March and erasing a significant portion of the gains that had driven the market to record highs just a day earlier. The selloff came after authorities signaled growing unease over the rapid rise of leveraged exchange-traded funds (ETFs) tied to South Korea’s biggest semiconductor companies.
The market collapse was led by heavy losses in the country’s chipmaking giants, Samsung Electronics and SK Hynix. Shares of both companies tumbled more than 12%, wiping billions of dollars from their combined market value and triggering an automatic 20-minute trading halt across the exchange as volatility surged.
The decline represents a sharp reversal for a market that has been one of Asia’s strongest performers in 2026. Driven largely by investor enthusiasm surrounding artificial intelligence, advanced semiconductors, and memory-chip demand, South Korean equities had enjoyed a remarkable rally throughout the year. On Monday, the KOSPI crossed the historic 9,100-point mark for the first time, fueled by soaring valuations in Samsung Electronics and SK Hynix.
However, the rapid ascent had also raised concerns that stock prices were becoming detached from fundamentals. The two semiconductor giants now account for more than half of the KOSPI’s total market capitalization, leaving the broader market increasingly vulnerable to swings in sentiment toward the chip sector.
Investor anxiety intensified after comments from South Korea’s financial regulator suggested that recent policy decisions may have inadvertently fueled speculative behavior. Earlier this week, Lee Chan-jin, head of the country’s market watchdog, acknowledged that authorities may have moved too quickly in approving leveraged ETFs linked to major chip stocks. These investment products, launched only last month, allow traders to amplify gains—and losses—by borrowing exposure to individual stocks.
The regulator’s remarks sparked fears that tighter oversight or additional restrictions could be introduced to cool the market, prompting investors to lock in profits after months of extraordinary gains.
Market analysts warned that the combination of soaring valuations, widespread retail participation, and increasing use of leverage had created conditions for heightened volatility.
Alexander Redman, Chief Equity Strategist at CLSA, said the scale of the market’s fluctuations reflects unusually strong participation from individual investors.
“Volatility has exploded,” Redman noted, arguing that such dramatic price movements are difficult to explain without significant retail involvement. He expressed concern that individual investors have become a major driving force behind the rally, particularly because many rely on borrowed funds and leveraged products to increase their exposure to the market.
According to Redman, the approval of leveraged single-stock ETFs effectively added more fuel to an already overheated market environment, increasing the risk of sharp corrections whenever investor sentiment shifts.
Regulators have already warned investors about the growing risks associated with leverage. Margin debt—the amount borrowed by investors to purchase stocks—recently climbed to a record high in June, underscoring the speculative nature of the rally.
Despite Tuesday’s dramatic selloff, South Korean equities remain among the world’s best-performing markets this year. The KOSPI is still up nearly 95% in 2026, highlighting just how powerful the semiconductor-driven rally has been. At the same time, the South Korean won has weakened about 6.5% against the U.S. dollar, creating additional uncertainty for international investors.
The turmoil in equities also influenced the bond market, where investors sought safer assets. Futures on three-year South Korean government bonds rose, while yields on both three-year and ten-year treasury bonds declined as money flowed out of stocks and into fixed-income securities.
Tuesday’s plunge serves as a stark reminder of the risks that accompany rapid market advances fueled by leverage and concentrated bets. With semiconductor stocks dominating South Korea’s market and retail investors playing an increasingly influential role, analysts expect volatility to remain elevated in the coming weeks as regulators, institutional investors, and traders reassess the sustainability of the year’s remarkable rally.
For now, the sharp correction has raised a critical question for investors: whether Tuesday’s collapse is merely a temporary pullback in a powerful bull market or the beginning of a broader reckoning for one of Asia’s hottest stock markets.
Source Reuters
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