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Japan and South Korea Stocks Open Lower; Kospi Falls Over 2%, SK Hynix Drops More Than 4%, SoftBank Down Over 3%

TradingKeyOct 20, 2026 12:35 AM

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On October 20, Japanese and South Korean stock markets declined in morning trade, with the KOSPI dropping 2.20% and the Nikkei 225 falling 0.77%, driven by weak semiconductor shares including Samsung Electronics and SK Hynix. This contrasted with overnight US markets, where the Nasdaq rose 1.11% and the S&P 500 gained 0.41%. The US tech and semiconductor sectors rebounded, led by Amazon and strong capital inflows into memory chip stocks, ending a previous losing streak for the Philadelphia Semiconductor Index.

AI-generated summary

TradingKey - On October 20, Japanese and South Korean stock markets both moved lower in morning trade, with South Korean equities extending losses. The South Korea Composite Stock Price Index (KOSPI) opened 0.60% lower at 5,733.57 points, before widening its decline to 2.20% at 5,641.21 points; Japan's Nikkei 225 Index (N225) opened 0.25% lower at 64,755.49 points, before dropping 0.77% to 64,415.21 points.

kospi-6858a96b19eb44fc83e7110cc0932c18

Source: TradingView

South Korean semiconductor leaders performed weakly, with Samsung Electronics falling 1.83% to 214,000 won (about $161); SK Hynix dropped 4.23% to 1.223 million won. In the Japanese market, Kioxia declined 1.07% to 13,455 yen (about $85); SoftBank Group fell 3.08% to 4,696 yen.

Overnight, US tech stocks rebounded, with the Nasdaq Composite Index rising 1.11% to 26,430.89 points, marking its largest single-day gain in two weeks; the S&P 500 Index climbed 0.41% to 7,690.73 points. Meanwhile, the Dow Jones Industrial Average fell slightly by 0.07% to 51,966.03 points. Amazon (AMZN) shares rose about 5%, making it one of the individual stocks driving the tech rebound.

The semiconductor sector also rebounded, with the Philadelphia Semiconductor Index rising 1.6%, snapping an eight-consecutive-session losing streak. Memory chip stocks staged a particularly noticeable recovery, as SanDisk (SNDK) jumped about 5.5% and SK Hynix-related American Depositary Receipts rose nearly 5%, indicating that overnight capital flowed back into select memory chip targets.

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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