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Japan, South Korea Stocks Diverge at Close; KOSPI Gains Nearly 1%, Samsung Rises Almost 4%, SK Hynix Advances Over 2%

TradingKeyAug 21, 2026 6:59 AM

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On August 21, Japanese and South Korean stock markets closed mixed, with South Korea's KOSPI rising 0.88% and Japan's Nikkei 225 falling 0.30%. Tech stocks drove market attention. SK Hynix advanced 2.31% amid reports it is evaluating a new memory chip plant in Japan, expanding its overseas footprint. Samsung Electronics climbed 3.87%, bolstered by reports of an upcoming shareholder return plan potentially reaching 110 trillion won. In Japan, Kioxia gained 2.59%, whereas SoftBank Group declined 2.45%. Semiconductor developments and corporate return strategies remained key focal points for regional investors navigating shifting equity valuations.

AI-generated summary

TradingKey - On August 21, Japanese and South Korean stock markets closed mixed. South Korea's KOSPI Index rose 0.88% to close at 6,912.94 points, while Japan's Nikkei 225 Index (JPN225) fell 0.30% to close at 66,016.36 points.

kospi-006bb990ec80428da2d9ed894d9ac357

Source: TradingView

South Korean tech stocks performed strongly overall. As of the close, SK Hynix rose 2.31% to 1.73 million won (about $1,248), while Samsung Electronics climbed 3.87% to 281,500 won.

In the Japanese market, Kioxia rose 2.59% to 54,320 yen (about $342), while SoftBank Group fell 2.45% to 5,255 yen.

The semiconductor sector attracted market attention. According to reports, SK Hynix is evaluating the possibility of building a memory chip plant in Miyagi Prefecture in northeastern Japan. If the South Korean memory chip maker's plan to establish a large-scale production base in Japan materializes, it will further expand its overseas manufacturing network.

Meanwhile, Samsung Electronics' shareholder return plan also became a market focus. According to South Korean media citing sources, Samsung Electronics is expected to announce a new shareholder return plan on Friday, which could reach 110 trillion won (about $79 billion).

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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