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Japan and South Korea Stocks Close Higher as KOSPI Surges Over 3%, Samsung Jumps More Than 6% and SK Hynix Gains Over 5%

TradingKeyAug 12, 2026 7:00 AM

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On August 12, Japanese and South Korean stock markets closed higher, led by a sharp rally in South Korean equities where the KOSPI Index surged 3.68% to 6,579.04 points. The semiconductor sector drove the rebound, with giants like Samsung Electronics and SK Hynix posting significant gains, triggering a temporary sidecar mechanism for the KOSPI. This momentum was further supported by reports that Singapore's Temasek plans to directly invest in South Korean semiconductor leaders, reflecting strong long-term demand and low valuations in the AI memory chip supply chain, which bolsters investor confidence.

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TradingKey - On August 12, stock markets in Japan and South Korea closed higher, with South Korean equities exhibiting particularly strong performance. Samsung surged 6%, SK Hynix jumped 5%, and Kioxia gained nearly 4%.

South Korea's KOSPI Index closed up 3.68% at 6,579.04 points, while the Nikkei 225 Index rose 0.83% to finish at 67,524.06 points.

During intraday trading, the KOSPI's gains expanded significantly at one point. The Korea Exchange triggered a temporary sidecar mechanism for the KOSPI after KOSPI 200 index futures rose 5%, suspending program buy orders for 5 minutes.

kospi-1256de61ac1c4880965d68e2734ba5dd

Source: TradingView

South Korea's semiconductor sector served as the primary driver of the broader market rebound. Samsung Electronics closed up 6.68% at 255,500 won (approx. $180), while SK Hynix gained 5.54% to 1,504,000 won, with both chip giants surging over 8% at their intraday highs.

In the Japanese market, memory chipmaker Kioxia rose 3.87% to 49,870 yen (approx. $313), while SoftBank Group gained a modest 0.66% to close at 5,520 yen.

On the capital flow front, Singapore sovereign wealth fund Temasek is reportedly planning to directly invest in the South Korean stock market using its own capital for the first time, with plans to allocate to Samsung Electronics and SK Hynix.

Market participants believe Temasek views memory chips as a segment within the AI supply chain with relatively low valuations but strong long-term demand potential, and plans to further increase its allocation to AI-related assets over the next five years. If realized, these investments could further bolster market confidence in the long-term growth prospects of South Korea's semiconductor leaders.

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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