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Japanese and South Korean Stocks Close Lower; Nikkei 225 Falls 0.6%, Kospi Drops 0.27%, Samsung Bucks Trend to Rise Nearly 1%

TradingKey

AuthorYulia Zeng

Sep 29, 2026 6:58 AM

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On September 29, Japanese and South Korean stock markets closed lower amid heightened caution, with the Nikkei 225 down 0.60% and the KOSPI down 0.27%. Tech stocks showed mixed performances; Samsung Electronics gained 0.93% while SK Hynix edged down 0.17%, and Japan's SoftBank dropped 3.35%. A key market focus was Samsung Electronics and its affiliates announcing a $1 billion investment in Helix Digital Infrastructure, a firm co-founded by KKR, the Kuwait Investment Authority, Nvidia, and Vistra. This capital aims to fund data center construction and power infrastructure, expanding Samsung's footprint to capture surging demand in the AI infrastructure sector.

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TradingKey - On September 29, Japanese and South Korean stock markets remained weak in afternoon trading as market wait-and-see sentiment picked up. Japan's Nikkei 225 Index (JPN225) closed down 0.60% at 65,481.22 points; South Korea's KOSPI Index closed down 0.27% at 6,870.82 points.

kospi-13b909358ed140578e40664e4faee4be

Source: TradingView

In individual stocks, South Korean tech shares diverged. SK Hynix closed down 0.17% at 1.765 million won (approx. $1,300); Samsung Electronics rose 0.93% to 272,500 won. In the Japanese market, SoftBank Group closed down 3.35% at 6,035 yen (approx. $38); Kioxia rose 0.56% to 17,880 yen.

One of the key market focuses came from Samsung Electronics' new investment plan in the AI infrastructure sector. According to reports, Samsung Electronics and its affiliates will invest a total of $1 billion in Helix Digital Infrastructure. Helix is a company focused on AI infrastructure, co-founded by global investment firm KKR (KKR), Kuwait Investment Authority, Nvidia (NVDA), and Vistra (VST).

This investment is mainly aimed at the expanding AI infrastructure market, with funds to be used for data center construction and underlying infrastructure such as power related to data center deployment. As demand for AI computing power continues to grow, the importance of data centers and supporting energy facilities is steadily increasing, and Samsung Electronics' latest move further expands its investment footprint in the AI infrastructure field.

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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