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South Korea's Kospi Opens Over 1% Higher as SK Hynix and Samsung Electronics Gain; Japanese Markets Closed

TradingKey

AuthorYulia Zeng

Sep 23, 2026 12:39 AM

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On September 23, South Korean stocks rose in early trading, driven by active momentum in semiconductor shares, with the KOSPI trading up 1.37% at 7,113.74 points. Large chip stocks extended gains, led by Samsung Electronics up 2.71% and SK Hynix up 2.01%. This upward trend followed overnight broad gains in U.S. memory chip stocks, which provided a positive market backdrop. Meanwhile, Japanese markets were closed for the Autumnal Equinox, and U.S. indices ended mixed, with the Nasdaq reaching a record high.

AI-generated summary

TradingKey - On September 23, South Korean stocks rose in early trading, with semiconductor shares showing active momentum. The Korea Composite Stock Price Index (KOSPI) opened up 1.94% at 7,153.99 points before narrowing its gain to 1.37%, trading at 7,113.74 points. Japanese stock markets are closed today for the Autumnal Equinox.

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Source: TradingView

Large South Korean chip stocks extended their gains. SK Hynix rose 2.01%, trading at 1.877 million won (approx. $1,391); Samsung Electronics advanced 2.71%, trading at 284,000 won.

Overnight broad gains in U.S. memory chip stocks provided a positive backdrop for the South Korean semiconductor sector. SanDisk (SNDK) surged 6.82%, Micron Technology (MU) gained 5.00%, Seagate Technology (STX) jumped 4.85%, Western Digital (WDC) rose 3.67%; chip design company Arm (ARM) advanced 3.19%.

The three major U.S. stock indices ended mixed, with the Dow Jones Industrial Average falling 0.36%, the S&P 500 remaining virtually flat, and the Nasdaq Composite Index rising 0.45% to close at 27,244.28 points, setting another record high.

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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