South Korea’s stock market suffered a sharp sell-off on Tuesday, Oct. 13, 2026. Growing concerns over intensifying competition in the global semiconductor industry and pressure from foreign investors drove the benchmark KOSPI down 7.4% to 5,914.35.
The steep decline followed a prolonged rally fueled by artificial intelligence demand. The market correction quickly spread across major Asian exchanges as investors reassessed technology shares, corporate pricing power, and broader macroeconomic risks.
Semiconductor Giants Lead Market Plunge
According to market data reported by The Associated Press, the KOSPI reached its lowest level since late July. This marked a dramatic reversal after climbing above 9,000 to an all-time high in June.
Major memory chipmakers bore the brunt of the selling pressure. Samsung Electronics shares fell 7.7%, while SK Hynix plunged 8.8%. Investor anxiety intensified following reports that recent technological advances by China’s memory chipmaker CXMT could challenge established market leaders like Samsung, SK Hynix, and Micron Technology.
Chris Weston, head of research at Pepperstone, noted that China’s expanding ambitions in the AI ecosystem are raising questions about established assumptions regarding market share and profit margins. While CXMT has yet to prove it can manufacture advanced high-bandwidth memory at scale, the developments have heightened worries over long-term pricing power.
Broader Asian and Global Market Impact
The regional market downturn extended well beyond South Korea’s borders:
- Japan: The Nikkei 225 dropped 2.5% to 67,292.39. Chip equipment maker Tokyo Electron fell 6.6%, and SoftBank Group lost 8%.
- Hong Kong & China: The Hang Seng declined 1% to 24,033.51, while the Shanghai Composite slipped 1.1% to 3,754.82.
- Taiwan & Australia: Taiwan’s Taiex fell 1.9%, with Taiwan Semiconductor Manufacturing Co. (TSMC) down 1.6%. Australia’s S&P/ASX 200 edged down 0.2% to 8,767.40.
The correction in Asia followed a cautious session on Wall Street, where tech-heavy shares faced headwinds. Broadcom CEO Hock Tan also warned investors that capital availability, rather than a lack of chips or electricity, could emerge as the ultimate bottleneck for the artificial intelligence industry’s rapid infrastructure buildout.
Investors Eye Economic Indicators and Commodities
Alongside equities, market participants monitored ongoing geopolitical and economic developments. Oil prices dropped more than 1%. International benchmark Brent crude fell 1.4% to $105.20 a barrel amid lingering concerns over Middle Eastern supply routes.
Traders also turned their attention to upcoming corporate earnings reports from major U.S. financial institutions. These included Citigroup, JPMorgan Chase, and Wells Fargo, alongside crucial upcoming economic data releases.
