In a display of extreme volatility, the South Korean stock market has experienced a dramatic "V-shaped" recovery. The benchmark Kospi index surged as much as 8.2% today, following three consecutive days of declines that had pushed the index down 15% from its recent record high.
Memory chip manufacturers spearheaded the powerful rebound, demonstrating that investor confidence in the artificial intelligence boom remains largely intact. These chipmakers were the unequivocal leaders of the rally. Shares of Samsung Electronics Co Ltd jumped up to 9.3%, while SK Hynix Inc soared more than 15% at one point. The robust performance of these heavyweight stocks directly contributed to the Kospi's largest single-day gain in recent sessions.
The previous trading day, fears over overheated AI-related trading and interest rate concerns triggered a sharp sell-off, which was severe enough to activate circuit breakers and briefly halt trading. Panic selling, amplified by the mechanics of leveraged exchange-traded funds (ETFs), led to irrational overselling in a short timeframe. Today's powerful bounce-back indicates that bargain hunters are stepping back into the market following the sell-off driven by those initial concerns.
"Samsung and SK Hynix belong to the world's most-watched industry sector, and they still possess the most attractive valuations. That hasn't changed," said An Hyungjin, CEO of Billionfold Asset Management in Seoul. He added that many investors had been waiting for a pullback to buy these chip stocks at lower prices.
Despite market caution over the short-term overheating of the AI theme, fundamental analysis suggests global demand for memory chips remains in an upward cycle. Several institutions view the recent correction as more of a sentiment-driven and technical adjustment rather than a reversal of the overarching AI industry trend.
Fueled by the AI wave, the Kospi index had more than doubled at its peak this year. Even after the recent pullback, the index is still up approximately 92% year-to-date for 2026. As share prices have risen rapidly, market volatility in South Korea has spiked dramatically.
The exchange has frequently paused programmatic buy or sell orders, with both the Kospi and Kosdaq indices triggering "sidecar" mechanisms (temporary halts on program trading) on Monday and Tuesday. The implied volatility for South Korean stocks surged 12 percentage points, on track for its highest closing level since 2008. Leveraged ETFs, which require daily rebalancing to maintain target leverage ratios, have been cited as exacerbating intraday swings.
"The volatility has become enormous, but this stems from a change in market structure, not a shift in the cyclical direction," said Lee Jongwook, an analyst at Samsung Securities. He advised investors to maintain their positions after the sell-off and even consider adding to them selectively.
Tuesday's rebound was led by domestic institutional investors, while foreign investors continued to be net sellers of Kospi stocks. South Korean retail investors were also net sellers. This pattern reflects how, amid severe turbulence, institutional investors are using pullbacks for portfolio rebalancing, while some retail investors and foreign capital remain cautious.
Overall, the South Korean stock market, particularly the chip sector, continues to be underpinned by the powerful support of the global AI capital expenditure cycle. In the short term, the deleveraging process of leveraged products and high implied volatility may continue to cause sharp intraday fluctuations. However, the fundamental and valuation factors have not deteriorated significantly.
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