Key points
- Nikkei Asia reported that Kioxia plans to invest about $6.3 billion in a new memory production facility in Japan, its biggest capacity push yet for AI data-center demand.
- Kioxia is Tokyo-listed with no US shares. The readable proxies are its flash partner Sandisk (SNDK), plus Western Digital (WDC) and Micron (MU), all higher on Wednesday.
- Kioxia already plans to spend about 470 billion yen a year through fiscal 2028 and has floated a third building at its Kitakami plant, so a new facility would widen a buildout that is already in motion.
Kioxia is planning a new memory plant in Japan, and the price tag is about $6.3 billion, Nikkei Asia reported early Thursday in Tokyo. The company is the flash-memory maker that Toshiba spun off, and one of the biggest NAND producers in the world. Nikkei described the project as an expansion of NAND flash capacity aimed at rising storage demand from AI data centers.
One caveat up front. As of Wednesday afternoon in New York, Kioxia had not issued a formal release confirming the figure, so this rests on Nikkei's reporting rather than a company announcement. We will update the piece when Kioxia confirms the site, the timeline and the cost.
The reported project would extend a spending program already underway. Kioxia laid out the spending back in June. At its investor day it guided to about 470 billion yen a year, near $3 billion, for fiscal 2026 through 2028, a jump of roughly 66% from the year before. The company has separately discussed adding a third building at its Kitakami operation in Iwate prefecture, where shipments of its 10th-generation, 332-layer NAND began this summer.
The reason is the same one lifting the whole memory group. AI data centers need enormous amounts of high-capacity storage, and NAND flash, long the low-margin corner of the memory market, has turned into a growth story again. Kioxia has said it expects to roughly double output to meet the demand.
The spending also reflects a race Kioxia cannot afford to sit out. Samsung and SK Hynix dominate memory, and China's YMTC has surged into contention for third in NAND. Kioxia has said its technology lead is narrowing, so adding capacity is how it defends share.
For US investors, there is no direct Kioxia ticker to buy. The closest read is Sandisk (SNDK), Kioxia's longtime joint-venture partner at the Yokkaichi and Kitakami fabs, which traded around $1,500 on Wednesday, up about 1.2%. Western Digital (WDC), which spun Sandisk off last year, was near $465, up about 3.3%, and Micron (MU), the one large US memory maker, sat around $937, up about 0.5%. A Kioxia capacity build is a read on NAND pricing and demand that flows through all three.
The number is large, but so is the moment. If Nikkei's figure holds, a $6.3 billion plant would rank among Kioxia's biggest bets since it opened Fab7 at Yokkaichi, a project that ran to about 1 trillion yen. The AI storage wave is being met with concrete and clean rooms, and Kioxia does not want to be the memory maker that shows up late.
Sources
- Nikkei Asia, Shuhei Ochiai, "Kioxia to invest $6.3bn in new memory production facility in Japan," August 27, 2026
- Share prices from market data (Nasdaq), midday August 26, 2026
