Kioxia Holdings, the Japanese memory-chip maker that rode an AI-driven surge to become the country's most valuable listed company earlier this year, saw its stock tumble nearly 9% on the day. The drop comes after a dizzying 2,000% gain over the past twelve months—nearly four times the return of Japan's next-best performer, AIMECHATEC—and follows a volatile stretch that has erased roughly 65% of the company's value from its June peak.
The AI-fueled rally hits a wall
Kioxia's meteoric rise was built on demand for NAND flash memory used in data centers, phones, and servers. The stock more than quintupled in 2025 alone, briefly making it Japan's most valuable listed company by market capitalization. But momentum cracked in late July after the company issued a forecast for fiscal half-year operating income of ¥3.16 trillion ($19.7 billion). Analysts read the numbers closely: the implied ¥1.89 trillion for the current quarter was weaker than expected, following a prior quarter of ¥1.27 trillion that itself missed analyst estimates.
A guidance that cooled the rally
The forecast signaled that the blistering pace of growth might be slowing. Shares had already fallen roughly 65% from their June peak of ¥112,700 by the time the guidance was released. The latest 9% drop extends that retreat. The company also announced a three-for-one stock split and an ¥800 billion buyback, moves aimed at broadening its shareholder base and signaling confidence. But the market focused on the softer outlook.
Stock split and buyback fail to stem the slide
The buyback and split are designed to make shares more accessible to retail investors, but they haven't stopped the selloff. A broader AI-stock rout is weighing on the sector, and Chinese NAND manufacturers are ramping up capacity, threatening Kioxia's pricing power. The stock's recent volatility has been extreme: it gained more than 40% in a five-day stretch, then reversed sharply.
Analyst divide and competitive threats
Wall Street is split on Kioxia's prospects. Fourteen firms rate the stock a buy, while only one recommends selling. Average price targets imply more than 100% upside from current levels. This week, Daiwa, UBS, and Goldman Sachs reaffirmed their buy ratings. Bernstein kept its sell rating unchanged. Revenue and profit still show strong year-over-year growth, but the question is whether that growth can accelerate again or if the Chinese competition and cooling AI demand will keep the stock under pressure.
For now, investors are watching whether the buyback and the stock split can attract enough new buyers to stabilize the share price—or if the next earnings report will provide a clearer picture of whether the NAND boom has further to run.
