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Japanese and South Korean Stocks Rise in Early Trading, Kospi Gains Over 2%, SK Hynix Up Nearly 4%, Kioxia Surges Over 5%

TradingKey

AuthorYulia Zeng

Oct 21, 2026 12:39 AM

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On October 21, Japanese and South Korean stock markets rebounded in early trading, driven by strength in semiconductor leaders. The KOSPI opened 2.05% higher, and the Nikkei 225 Index gained 1.41%. Key advancers included Samsung Electronics, SK Hynix, Kioxia, and SoftBank Group. Meanwhile, overnight U.S. indices closed mixed, with gains in the Dow Jones and S&P 500, while the Nasdaq dipped slightly. Tech stocks showed divergent after-hours performance, highlighted by surges in SpaceX and Super Micro Computer, contrasted by a decline in Netflix.

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TradingKey - On October 21, Japanese and South Korean stock markets rebounded in early trading, with both markets opening higher. The Korea Composite Stock Price Index (KOSPI) opened 2.05% higher at 5,666.34 points, before extending gains to 2.10% at 5,669.58 points; Japan's Nikkei 225 Index opened up 1.26% at 64,885.95 points, before expanding gains to 1.41% at 64,979.50 points.

kospi-d14b7f25bb3f4438aa90331eca608670

Source: TradingView

South Korean semiconductor leaders strengthened in early trading, with Samsung Electronics gaining 2.72% to 217,500 won (approx. $164) and SK Hynix advancing 3.92% to 1.271 million won. In the Japanese market, Kioxia surged 5.18% to 13,820 yen (approx. $8), while SoftBank Group rose 3.56% to 4,716 yen.

Overnight, the three major U.S. stock indexes showed mixed performance. The Dow Jones Industrial Average rose 1.02% to 52,495.88 points; the S&P 500 Index gained 0.28% to 7,712.57 points; and the Nasdaq Composite Index dipped 0.02% to 26,424.82 points. Tech stocks diverged in after-hours trading, with SpaceX (SPCX) surging nearly 7%, Super Micro Computer (SMCI) jumping 11% after announcing preliminary results, while Netflix (NFLX) fell 5.6%.

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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