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Japan, South Korea Stocks Close Higher; Kospi Rises Over 3%, Samsung, SK Hynix Gain Over 5%, Kioxia Up Nearly 3%

TradingKeyOct 21, 2026 6:58 AM

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On October 21, Japanese and South Korean stock markets rebounded following heavy sell-offs, with the KOSPI rising 3.29% to 5,735.67 points and the Nikkei 225 gaining 0.85% to 64,621.24 points. Semiconductor leaders drove the recovery, including sharp surges in Samsung Electronics and SK Hynix. Cathie Wood attributed recent volatility in memory chip stocks to terminal cost pressures from rapid price increases impacting consumer electronics sales. Despite this short-term correction, she remains fundamentally bullish on the semiconductor sector, emphasizing strong long-term growth prospects for AI infrastructure.

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TradingKey - On October 21, Japanese and South Korean stock markets rebounded in tandem. Korea's Composite Stock Price Index (KOSPI) closed up 3.29% at 5,735.67 points, while Japan's Nikkei 225 Index closed up 0.85% at 64,621.24 points.

kospi-6f98fcdf3c1f4999a37b47a9470ce579

Source: TradingView

Previously, the South Korean stock market suffered a heavy sell-off. On October 20, the KOSPI fell 3.73% to close at 5,552.75 points, hitting its lowest closing level since April 7, after dropping as much as 4.76% intraday and breaking below the 5,500-point mark.

South Korean semiconductor leaders rebounded sharply, with Samsung Electronics surging 5.67% to 223,500 won (about $169) and SK Hynix gaining 5.81% to 1.294 million won. In the Japanese market, Kioxia rose 2.82% to 13,510 yen (about $85), while SoftBank Group advanced 1.49% to 4,622 yen.

Regarding the recent severe volatility in memory chip stocks, Cathie Wood remains optimistic. She believes that the recent pullback in memory chip stocks was partly due to the negative impact of earlier rapid price increases. The sharp surge in chip prices drove up terminal costs for consumer electronics, leading to a noticeable decline in sales for some end products, an effect that has gradually been reflected in stock prices. However, she remains bullish on the semiconductor industry's fundamentals and believes the long-term development prospects for AI infrastructure remain bright.

This content was translated using AI and reviewed for clarity. It is for informational purposes only.

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Disclaimer: The content of this article solely represents the author's personal opinions and does not reflect the official stance of Tradingkey. It should not be considered as investment advice. The article is intended for reference purposes only, and readers should not base any investment decisions solely on its content. Tradingkey bears no responsibility for any trading outcomes resulting from reliance on this article. Furthermore, Tradingkey cannot guarantee the accuracy of the article's content. Before making any investment decisions, it is advisable to consult an independent financial advisor to fully understand the associated risks.

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