AI boom turns Kioxia into Japan’s quiet chip giant

AI data centers put Kioxia in the spotlight

Kioxia is suddenly one of Japan’s most valuable companies, fueled by the global rush to build AI data centers that need vast amounts of memory.

At a new factory in northern Japan, robotic transporters ferry silicon wafers along overhead rails as Kioxia races to meet what it calls overwhelming AI-driven demand.

The surge in AI infrastructure has created shortages and sent memory prices soaring, with Kioxia emerging as one of the clearest winners.

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From obscure supplier to market-cap leader

While Kioxia is barely known outside the tech sector, its share price has jumped around sevenfold this year.

In June, it briefly became the largest Japanese firm by market capitalization, overtaking Toyota.

Other once-obscure Asian supply-chain players are also breaking out, including South Korea’s SK hynix, which listed on Wall Street last week after one of the world’s largest-ever stock sales.

NAND flash at the heart of AI build-outs

Different types of memory chips sit alongside high-performance processors in AI systems, storing the data needed to generate chatbot outputs or synthesize realistic images.

Kioxia specializes in NAND flash chips, which have become an increasingly hot commodity as AI agents—tools that can carry out tasks for users—demand ever more storage.

AI use “has been expanding rapidly,” so “we have high expectations that the market for the flash memory we produce will continue to expand,” Kioxia CEO Hiroo Ota said this month at the new chip fab that opened in September in northern Japan.

Counterpoint Research analyst MS Hwang told AFP that “Kioxia’s stock price surge represents a normalization of valuation for what was once an 'ignored sector.'”

Chinese pressure and bubble fears

Hwang flagged one major challenge: “maintaining its competitive edge amid rivalry” from China’s Yangtze Memory Technologies Co. (YMTC), a rapidly growing maker of the same class of chips.

There are also broader concerns about overstretched valuations and whether the eye-watering sums being poured into AI will ultimately pay off.

Kitakami’s boom—and anxiety

The new fab is Kioxia’s second facility in the green outskirts of Kitakami, a city that already hosts several large factories.

AFP saw rows of bulky white chip-etching tools in a cleanroom where conditions are tightly controlled to avoid dust contamination.

Near Kitakami station, 47-year-old recruiter Noriyuki Takahashi said business has picked up sharply thanks to Kioxia:

“It’s a good thing to have so many jobs here, with business sentiment improving,” he told AFP.

But local views are mixed. Hana, 57, who runs the bar Tachinomi Hanachan, said:

“Semiconductors are an industry with a lot of ups and downs. The locals are anxious about how long it will last.”

She added that some Kitakami workers are getting bonuses that are “impossibly high” for the region, even as “Taiwan is working hard, other places are working hard.”

“It’s good for the moment, but when we ask how many years the demand will continue, the local community is looking at it with unease.”

Japan’s chip ambitions return

Japan once controlled about half of the global semiconductor market in its 1980s peak. The government says that share has since fallen to less than 10%.

Tokyo now wants an eightfold revenue increase from domestically produced microchips by 2040 compared with 2020 levels.

The country is building a chip hub with top-end technology in northern Hokkaido, while Taiwanese chipmaker TSMC operates a plant in southern Kyushu.

Kioxia itself traces back to Toshiba Memory, a pioneering memory business that Toshiba sold off in 2018 while in deep financial trouble.

Today, Kioxia is planning a U.S. listing like SK hynix, and is forecasting 1.3 trillion yen ($8 billion) in operating profit for April–June, a huge jump from 45 billion yen a year ago.

For an industry long defined by brutal boom-and-bust cycles, AI has added a new, sharper edge to both the upside and the risk.