Japanese semiconductor giant Kioxia's stock plunges 50% in one month

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Japanese semiconductor giant Kioxia’s stock plummeted 50% in a month amid shifting market sentiment. On July 18, 2026, Kioxia’s shares dropped 16% in a single day, marking a 50% decline from its peak one month earlier. IPEX, Tokyo Electron, and Sumitomo Metal Mining also fell 8–10%. The Philadelphia Semiconductor Index (SOX) has declined 21% from its June 22 high, signaling a bear market. TSMC’s stock dropped 7% despite exceeding earnings expectations. Analysts attribute the pullback to profit-taking rather than fundamental weaknesses. Meanwhile, South Korea and Taiwan’s chip ETFs saw $6.4 billion and $2.8 billion in inflows, as fear and greed index data indicates renewed interest in altcoins to watch.

BlockBeats news: On July 18, the global semiconductor sector continued to weaken, with Japanese semiconductor leader Kioxia plunging 16% in a single day, down approximately 50% from its high point a month ago. Meanwhile, Japanese chip industry stocks such as Ibiden, Tokyo Electron, and Sumitomo Metal Mining generally declined by 8% to 10%.


In the U.S. market, the Philadelphia Semiconductor Index (SOX) has declined approximately 21% from its historical high on June 22, officially entering a technical bear market. Despite TSMC reporting better-than-expected earnings and raising its guidance, its stock still dropped 7%, indicating continued pressure on market sentiment.


Reports indicate that multiple institutions believe the current semiconductor sector correction is primarily driven by overcrowded positions and profit-taking, rather than a deterioration in industry fundamentals. Meanwhile, Citi data shows that this week, semiconductor-related ETFs in South Korea and Taiwan received net inflows of approximately $6.4 billion and $2.8 billion, respectively, while South Korea’s stock market also saw about $500 million in net foreign investment, suggesting that some capital has begun to position itself at lower levels.

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