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Kioxia Holdings Corp (285A): Japan's Only AI Pure-Play at 36% Off Its High

Move over, Toyota. A Toshiba flash-memory spinoff is now Japan’s most valuable company.

Rei Saito's avatar
Rei Saito
Jul 15, 2026
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Disclaimer: This content is for informational purposes only, not investment advice. I may own equities mentioned in this article. Investing involves risk, so always do your own research before buying or selling any securities.

Kioxia Holdings (285A.T): Hold | Last: ¥71,870 | Mkt Cap: ¥39.45T (US$242.6B)

In 1987, Dr. Fujio Masuoka filed a patent at Toshiba for something the world was not ready for. It was NAND flash memory, the foundation underneath every smartphone, every SSD, and every AI data center on the planet. Toshiba took the credit, paid him less than a million dollars for the patents, and then spent the next three decades systematically running the parent company into the ground:

Worse Than Kodak: The Inside Story of Toshiba's Self-Inflicted Extinction

Worse Than Kodak: The Inside Story of Toshiba's Self-Inflicted Extinction

Rei Saito
·
Jul 11
Read full story

That orphan is now Kioxia Holdings (285A.T). The stock climbed 6,500% from its IPO, ripped to ¥112,700, briefly overtook Toyota as Japan’s most valuable company! Right after, the stock dropped 36% in weeks. The dip is either the buy of a decade or the top of a cycle.

The market is hurling billions a quarter at software and AI startups with no FCF, while the industrial monopolies actually building the AI boom trade like regulated utilities.

Kioxia is the cleanest pure-play on that gap.

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