Kioxia's Dual Bet: CXL Memory Expansion and a Deepening Applied Materials Alliance

Kioxia partners with Applied Materials on AI memory and advances CXL expansion; Toshiba trims its stake as a US listing stays undecided.

Kioxia is pushing on two fronts at once — rethinking how data centers feed memory to AI processors, and widening its ties to the equipment makers that build the tools to do it. At the heart of the first effort is a NAND-based memory expansion built around the Compute Express Link (CXL) interface standard, designed to complement conventional DRAM in AI systems. The pitch: servers that carry meaningfully more memory capacity without a matching jump in cost.

A Partner in Applied Materials' EPIC Center

On the manufacturing side, the company confirmed on September 29 that it is joining Applied Materials' planned EPIC Center as an innovation partner. The two will collaborate on next-generation memory structures, chip stacking techniques, and materials research aimed at lifting the performance of memory components for AI workloads. The work spans advanced memory cells, new architectures, and material-specific development tuned to the demands of modern AI applications.

That partnership lands as the memory industry grapples with a familiar squeeze: feeding ever-hungrier models without letting chip designs balloon in cost. Raw capacity gains alone no longer suffice — integration approaches that ease transfer bottlenecks between processors and memory chips are taking on greater weight.

Toshiba Trims Its Holding

Behind the technology headlines, Kioxia's shareholder base shifted. A mandatory disclosure dated September 14 revealed that Toshiba had cut its stake in Kioxia Holdings from 14.06% to 12.84%, with the reporting trigger dated September 7. The Japanese industrial group remains a significant holder, but the direction of travel is clear.

Meanwhile, plans for a U.S. listing remain in play. Roughly three weeks before the disclosure, word emerged that Kioxia was preparing steps toward a stateside IPO — a report that has since coincided with a 13.3% gain in the shares. Media accounts floated a Nasdaq listing of American Depositary Shares sometime between April and June 2027. On September 15, however, the company stressed that those reports were not official corporate announcements. Preparations for a listing were confirmed, but specifics — timing, venue, and structure — are undecided, and the company has not ruled out abandoning the effort altogether.

Micron's Blowout Lifts the Sector

Sentiment got a jolt from across the Pacific. Micron Technology reported fourth-quarter fiscal 2026 results that beat expectations, and Kioxia shares climbed 4.2% on Thursday in response, according to media reports. Micron pointed to more than $32 billion in customer commitments under long-term supply agreements, and said demand for AI memory solutions should stay robust through at least 2028 while supply remains tight. Reuters characterized the signals as reinforcing market optimism about sustained AI investment and memory module demand.

Not everyone is convinced. Bernstein reaffirmed its Sell rating on Kioxia Holdings on September 29, a skeptical note against a stock that has already run hard: the shares are up 463% year to date.

Platinum Status and a Software Refresh

On the operational front, Kioxia Iwate Corporation — the subsidiary behind the Kitakami plant — earned Platinum status under the Responsible Business Alliance's Validated Assessment Program for the third time, scoring a full 200 points in the August review.

Product maintenance continued as well. On September 28, the company released version 1.0.2 of its SSD FW Updater, giving Linux users a refreshed maintenance tool for its storage drives. Buffalo handles sales and customer support for the relevant branded consumer SSDs.

The stock closed Friday at EUR 106.90, capping a year that has seen the equity multiply more than fivefold.

Investors will get a clearer read on the business itself before long. Kioxia Holdings has scheduled the release of its second-quarter fiscal 2026 results for October 30, 2026, with the announcement set for 18:45 JST.