The Japanese chipmaker has outpaced the next-best stock in Japan by almost four times, but recent earnings guidance, buyback plans and AI-memory concerns have left investors divided.
Kioxia Holdings has climbed 2,000% over the past year, making it the top-performing stock in Japan and leaving it nearly four times ahead of the country’s next-best performer, AIMECHATEC, which is up 540.30% over the same period. The rally was driven by the AI buildout, as demand from data centers for NAND flash memory pushed prices and profits sharply higher through 2025 and into this year. Momentum has become far more volatile in recent weeks. Kioxia fell nearly 9% on the day cited after already retreating about 65% from its June peak of ¥112,700, even though it paired its latest outlook with a three-for-one stock split and an ¥800 billion buyback. The company forecast fiscal half-year operating income of ¥3.16 trillion, implying a weaker-than-expected ¥1.89 trillion for the current quarter after a prior quarter’s ¥1.27 trillion missed analyst estimates. Analysts remain split but broadly constructive, with 14 Buy ratings and one Sell, while average price targets imply more than 100% upside. The key question is whether the latest pullback is a reset within a durable AI memory cycle or an early sign that rising Chinese NAND capacity is eroding pricing power.