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Japan and South Korea Stocks Rebound Strongly, SoftBank Surges 16%, South Korean Stock Rally Triggers Trading Halt, Samsung Strike Suspension Is Key Catalyst

TradingKeyMay 21, 2026 1:04 AM

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Asia-Pacific stock markets rallied Thursday, led by Japan and South Korea, recovering from recent losses on an overnight U.S. market rebound. Japan's Nikkei 225 saw gains exceeding 3%, while South Korea's KOSPI rose over 5%, triggering a circuit breaker. SoftBank Group surged up to 16%. Samsung Electronics climbed more than 5% after its union suspended a planned strike following a tentative labor agreement. This easing of supply chain concerns, coupled with optimism over reduced U.S.-Iran conflict, fueled a return of global capital to Asian markets.

AI-generated summary

TradingKey - Major Asia-Pacific stock markets strengthened collectively during Thursday morning's session, with Japanese and South Korean markets showing a significant recovery driven by an overnight rebound in U.S. stocks.

The Nikkei 225 Index opened nearly 1% higher, with intraday gains subsequently expanding to over 3%, effectively reversing a five-session losing streak. SoftBank Group's stock performance was particularly stellar, with gains surging up to 16% at one point, marking its largest single-day increase since May 7.

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South Korea's KOSPI Index opened 3.8% higher in morning trading, with gains further expanding to 5.1%. The Korea Exchange triggered the KOSPI circuit breaker mechanism after KOSPI 200 futures rose by 5%, resulting in a five-minute suspension of program trading.

Samsung Electronics, as South Korea’s leading technology stock, rose more than 5% in tandem, providing strong support for market sentiment.

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Notably, the latest developments in Samsung Electronics' labor-management relations have injected positive signals into the market. According to Yonhap News Agency, just before the company's union was scheduled to launch a general strike, both sides reached a tentative agreement mediated by South Korean Minister of Employment and Labor Kim Young-hun, prompting the union to suspend the strike.

Previously, both parties were in a deadlock over issues such as performance bonus distribution, and the union had planned an 18-day strike. The reaching of this tentative agreement has temporarily eased market concerns regarding the stability of Samsung's supply chain. The union stated that all members will vote on the agreement starting from the 22nd, with the final outcome yet to be determined.

Meanwhile, as optimistic expectations for the easing of the U.S.-Iran conflict grew, the three major U.S. stock indices closed higher overnight. This significant recovery in risk appetite subsequently drove global capital back into Asian markets.

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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