Kioxia Beats Japan’s Next-Best Stock 4x Over. Success or Bust?
Kioxia Holdings has gained 2,000% over the past year, nearly four times Japan's next-best-performing stock. The chipmaker is down nearly 9% today, leaving investors torn between calling it a success or a bust.
Kioxia (285A) sits far ahead of the field on the Tokyo Stock Exchange. AIMECHATEC, the second-best yearly gainer, is up 540.30% over the same period.
A Rally Built on AI Demand, Then Tested by Guidance
Kioxia's rally traces back to the AI buildout. Data centers scrambling for NAND flash memory, the storage chips used in phones and servers, pushed prices and profits sharply higher through 2025 and into this year. The stock surged more than 500% in 2025 alone, briefly making Kioxia Japan's most valuable listed company by market cap.
That momentum cracked in late July. Kioxia forecast fiscal half-year operating income of ¥3.16 trillion ($19.7 billion). That figure implies a weaker-than-expected ¥1.89 trillion for the current quarter, after a ¥1.27 trillion prior quarter that already missed analyst estimates. Kioxia paired the outlook with a three-for-one stock split and an ¥800 billion buyback, aimed at broadening its shareholder base.
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