The Technology Is Jointly OwnedThin moat

Kioxia Holdings (285A) — moat facet

The nearest competitor at similar scale cannot be out-engineered on flash, because the engineering belongs to both of them.

Most manufacturing partnerships share a building. This one shares the invention.

NAND revenue share, Q1 2026 (%)Kioxia14%Sandisk13%Counterpoint Research, NAND revenue share, Q1 2026; both built on the same jointly owned process
One point of share separates two companies running the same fabs and the same technology.

Sandisk's prospectus states that the two companies co-develop flash technologies — including process technology and memory design — for Flash Ventures' use, and that they jointly own the co-developed technologies1. It also states that substantially all of Sandisk's flash memory comes from these ventures2.

Read that as a competitive fact and it is startling: Kioxia's principal rival at similar scale cannot be out-engineered on the thing that matters most, because the engineering belongs to both of them. What separates the two companies in the market is controllers, firmware, channel, brand and drive design — the layers above the flash, not the flash.

Read it as an economic fact and it is the reason both exist. Neither company could fund a leading-edge flash roadmap alone at 13% and 14% of a market where Samsung has 29%3. Shared, the arithmetic works.

This is the clearest instance in the collection of two competitors who are structurally unable to compete on their core product, and have organised themselves accordingly.

The number that tests it is the gap between the two companies' gross margins. If they diverge materially, something above the flash is doing the work; if they track, the joint ownership is the whole story.

Moat trajectory: Holding steady

Co-development and joint ownership of the process technology is the founding term of the arrangement and was carried into the 2034 extension. It neither improves nor deteriorates — it simply caps how far apart the two companies can get.

The number that tests this moat
Reported
Blended average selling price change, June 2026 quarter
About +70% year on year, on low single-digit bit growth

Kioxia and Sandisk share the process, so price and product mix are what separate them; a price reversal hits both at once.

Source: Kioxia Holdings first-quarter FY2026 results and earnings call (three months to 30 June 2026), as reported by BigGo Finance ↗
⚠ Threats to the moat
⚠ THREAT 01
A Rival With Your Cost Base Is a Rival Who Never Goes Away
A commodity market normally consolidates by squeezing out the highest-cost producer; here the second-closest rival has the same cost base by…
References
  1. ReportedSandisk and Kioxia co-develop flash technologies including process technology and memory design, and jointly own the result.
    Sandisk Corporation, Form 424B4 prospectus (SEC, CIK 2023554) — Sandisk and Kioxia operate three business ventures, Flash Partners Ltd., Flash Alliance Ltd. and Flash Forward Ltd. (collectively 'Flash Ventures'), across seven flash-based manufacturing facilities in Japan, six in Yokkaichi and one in Kitakami, with an eighth beginning operations in calendar year 2025. 'We co-develop flash technologies (including process technology and memory design) with Kioxia for Flash Ventures' use. We and Kioxia jointly own these co-developed flash technologies.' 'Substantially all of our flash-based memory is obtained from our joint ventures with Kioxia... While substantially all of our flash memory supply utilized for our products is purchased from these ventures, from time to time, we also purchase flash memory from other flash manufacturers.' Sandisk names Kioxia, Micron, Samsung, SK Hynix and YMTC among its competitors, and completed its separation from Western Digital in February 2025. — FY2025 · publ. 2025-05 · source ↗
  2. ReportedSubstantially all of Sandisk's flash memory comes from the joint ventures with Kioxia.
    Sandisk Corporation, Form 424B4 prospectus (SEC, CIK 2023554) — Sandisk and Kioxia operate three business ventures, Flash Partners Ltd., Flash Alliance Ltd. and Flash Forward Ltd. (collectively 'Flash Ventures'), across seven flash-based manufacturing facilities in Japan, six in Yokkaichi and one in Kitakami, with an eighth beginning operations in calendar year 2025. 'We co-develop flash technologies (including process technology and memory design) with Kioxia for Flash Ventures' use. We and Kioxia jointly own these co-developed flash technologies.' 'Substantially all of our flash-based memory is obtained from our joint ventures with Kioxia... While substantially all of our flash memory supply utilized for our products is purchased from these ventures, from time to time, we also purchase flash memory from other flash manufacturers.' Sandisk names Kioxia, Micron, Samsung, SK Hynix and YMTC among its competitors, and completed its separation from Western Digital in February 2025. — FY2025 · publ. 2025-05 · source ↗
  3. Third-party estimateSandisk holds about 13% and Kioxia about 14% of NAND revenue, against Samsung's 29%.
    Counterpoint Research — global NAND memory market share. The NAND market reached a record US$46 billion in the first quarter of 2026, growing about 90% sequentially and roughly 3.5 times against the first quarter of 2025. Share by revenue: Samsung 29%, SK hynix 18%, Kioxia 14%, Micron 13%, Sandisk 13% and YMTC 13% — YMTC having risen from about 8% a year earlier. — Q1 2026 · publ. 2026 · source ↗
Sources
Generated September 23, 2026