Kioxia's Gravity-Defying Numbers Meet a Market That's Looking the Other Way

Kioxia posts record revenue and 75% operating margin, but shares fall 35% in a month as guidance misses estimates, raising questions about valuation.

There is a peculiar disconnect at the heart of Kioxia's current market story. The Japanese memory-chip maker has just delivered the kind of quarter that most companies can only dream about — record revenue, an operating margin that would make a luxury-goods house envious, and a shareholder-return package that includes both a buyback and a stock split. And yet the shares keep sliding, leaving investors to puzzle over whether the market knows something the financial statements don't.

The latest session was another bruising one. Kioxia fell 4.01 percent on Friday to EUR 261.10, a drop that unfolded against a broader sell-off across Asian equities, with the Kospi shedding around 2 percent and the Nikkei 225 losing more than 1 percent. That extends a pullback that has now shaved 35.08 percent off the stock over the past 30 days, leaving it 57.09 percent below its 52-week high. For a company that reported a 415.5 percent year-on-year revenue surge, the market's response has been nothing short of dismissive.

A Quarter for the Record Books — With a Caveat

The numbers Kioxia posted for the first quarter of fiscal 2026 (April through June) were, by any measure, extraordinary. Revenue hit JPY 1.77 trillion, operating profit reached JPY 1.33 trillion, and the operating margin came in at 75 percent. CFO Yoshihiko Kawamura was quick to point out that the company generated more non-GAAP operating profit in those three months alone than in the entirety of the previous fiscal year, which delivered JPY 876.2 billion.

But there was a wrinkle. The headline figures, while spectacular, actually came in slightly below what the market had been expecting. Analysts had penciled in operating profit of JPY 1.37 trillion and revenue of roughly JPY 1.84 trillion. The guidance for the current quarter also carried a hint of disappointment: Kioxia is projecting revenue of JPY 2.39 trillion and operating profit of JPY 1.9 trillion, the latter sitting just under the Bloomberg consensus estimate of JPY 1.95 trillion.

The profit engine behind these numbers is unmistakably price. Average selling prices for NAND flash memory jumped around 70 percent year on year, while shipment volumes grew only in the low single digits. The company expects price increases to drive roughly 70 percent of the projected revenue growth in the current quarter as well. That concentration is both the bull case and the bear case in a single statistic.

The Bullish Argument: AI Demand and Contract Security

For optimists, the structural demand from artificial intelligence and data-center buildouts provides a durable foundation. The SSD & Storage segment already contributes more than 60 percent of group revenue, having grown 95.7 percent quarter on quarter. On the product front, Kioxia has been burnishing its technological credentials: its GP1 series of PCIe-6.0 NVMe SSDs, designed for direct GPU access, took home a "Best of Show" award at the FMS conference in Santa Clara, and the company — together with partner SanDisk — claims a new industry benchmark for bit density in QLC NAND. First samples of the GP1 line are slated for select customers by the end of 2026.

Management is also working to smooth out the notorious cyclicality of the NAND market. Kawamura said the company is negotiating long-term supply agreements with key customers that could secure roughly half of annual shipment volumes by calendar 2028. If that strategy takes hold, it would give Kioxia a measure of margin stability that memory-chip makers have rarely enjoyed.

The balance sheet, meanwhile, has been transformed. After fully repaying its corporate loans, Kioxia now sits in a net cash position, with its equity ratio improved to 51 percent. That financial firepower is being deployed in part through a buyback of up to JPY 800 billion — covering as many as 30 million shares, or around 5.5 percent of outstanding stock — running from August 3 through October 30 on the Tokyo exchange. A one-for-three stock split is set to take effect on October 1.

The Bearish Argument: A Legal Cloud and a Crowded Trade

The skeptics have their own evidence, and it starts with the share price itself. A stock that has fallen 57 percent from its high while the company was posting record results suggests that a great deal of optimism had been priced in well before the latest earnings release — and is now being steadily unwound. The annualized volatility of 183.19 percent underscores just how febrile trading in the name has become.

Then there is the legal overhang. On July 18, a jury in the U.S. District Court for the Western District of Texas found that Kioxia's subsidiaries, Kioxia Corporation and Kioxia America, had infringed a Viasat patent related to error correction in flash memory. The verdict, confirmed by the court on July 31, carries damages of USD 229,025,021 — roughly JPY 37.1 billion. Kioxia has called the ruling "completely unacceptable" and plans to appeal, meaning the dispute is far from settled. The company has already booked a provision for the damages in its first-quarter results and says it does not expect further charges for now, but the uncertainty alone is a weight on the stock. The initial jury decision alone knocked more than 16 percent off the share price in a single day.

A Changing Shareholder Base

The ownership picture is also in flux. Bain Capital, the private equity firm that held around 44 percent of Kioxia late last year, has sold its entire stake and exited completely, according to Bloomberg, which estimates the investor banked a profit of roughly USD 15 billion on the way out. Toshiba remains the largest shareholder with approximately 22 percent, while a special-purpose vehicle linked to South Korea's SK Hynix holds 14 percent.

What Comes Next

The near-term calendar offers a few potential catalysts. The buyback runs through the end of October, and the stock split takes effect on October 1 — both events that could provide some support if management's capital-return program gains traction. The next substantive test comes on November 12, when Kioxia reports second-quarter results and investors will see whether the company can deliver on its guidance of JPY 2.39 trillion in revenue.

The fundamental question, however, remains the trajectory of NAND prices. If the rally in average selling prices persists and the long-term contract strategy gains ground, the earnings power Kioxia has demonstrated could prove sustainable. If pricing rolls over — or the Viasat litigation takes a turn for the worse — the current correction could have further to run. For now, the market is voting with its feet, and it is not yet convinced.