Kioxia Stocks Gain 2,000% Over Past Year, Fall 9% After Guidance Miss

Kioxia Holdings stocks gained 2,000% over the past year, nearly four times the performance of Japan's next-best stock, but fell nearly 9% today. The chipmaker's rally was driven by AI-fueled demand for NAND flash memory used in data centers, pushing the stock up more than 500% in 2025 alone and briefly making Kioxia Japan's most valuable listed company by market cap. The momentum cracked after the company forecast weaker-than-expected operating income in late July, triggering a retreat from June highs. The sharp reversal has left investors divided on whether the stock remains a long-term opportunity or faces sustained pressure from Chinese manufacturing capacity and cooling AI sector sentiment.

Kioxia 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. The rally traces back to the AI buildout, as data centers scrambled for NAND flash memory used in phones and servers, pushing prices and profits sharply higher through 2025 and into this year.

Kioxia Forecast Weaker Operating Income in Late July

In late July, Kioxia forecast fiscal half-year operating income of ¥3.16 trillion ($19.7 billion). That figure implies ¥1.89 trillion for the current quarter, following a ¥1.27 trillion prior quarter that already missed analyst estimates. The company paired the outlook with a three-for-one stock split and an ¥800 billion buyback, aimed at broadening its shareholder base.

Shares had already retreated roughly 65% from their June peak of ¥112,700 by then. A broader AI-stock selloff pressured the sector, and Chinese NAND manufacturers ramped up capacity, threatening the pricing power behind Kioxia's climb. The latest 9% drop follows a stretch of sharp swings. Kioxia shares gained more than 40% in a recent five-day stretch, then reversed sharply.

Kioxia has faced a huge rise and fall in the past year. Image Source: Trading View

Analysts Remain Split on Kioxia Stock Outlook

Fourteen firms rate Kioxia a buy, while one recommends selling. Average price targets imply more than 100% upside. Daiwa, UBS, and Goldman Sachs reaffirmed buy ratings this week, while Bernstein kept its sell rating unchanged. Revenue and profit still show strong year-over-year growth.

FAQ

What caused Kioxia stocks to gain 2,000% over the past year?

The rally was driven by AI-fueled demand for NAND flash memory used in data centers. Data centers scrambling for storage chips pushed prices and profits sharply higher through 2025 and into this year, with the stock surging more than 500% in 2025 alone.

Why did Kioxia stocks fall 9% today?

The drop follows Kioxia's late July forecast of fiscal half-year operating income of ¥3.16 trillion, implying a weaker-than-expected ¥1.89 trillion for the current quarter. Shares had already retreated roughly 65% from their June peak of ¥112,700 before today's decline, pressured by a broader AI-stock selloff and increased capacity from Chinese NAND manufacturers.