⚠ Shared Technology Is Shared With a CompetitorHigh threat
Sandisk (SNDK) — threat to the moat
The technology contest between the third- and fifth-largest NAND producers is a tie by construction, because it is the same technology.
Everything Sandisk knows about making this flash, its closest competitor knows at the same moment.
That is not an inference. Sandisk and Kioxia co-develop the process technology and memory design and jointly own the result, and license each other whatever they develop independently that the joint work needs.1 The two companies then sell finished drives against each other into the same markets, with Kioxia at 15.3% of NAND revenue and Sandisk at 12.4%.2
So the technology dimension of competition between the industry's third- and fifth-largest producers is, by construction, a tie. Neither can build a cost advantage in the fab, because it is the same fab. Neither can win a node transition, because it is the same node. What is left to compete on is controllers, firmware, drive design, channel and brand — which is to say, everything above the flash.
Sandisk's answer is that this is where it is strong, and the evidence broadly supports it: the consumer brand is unmatched in memory and the enterprise SSD franchise is real. Kioxia's answer is that it supplies major Japanese and global electronics makers where Sandisk is weaker. The two have coexisted this way for over 25 years.
The uncomfortable version is that a genuine technology breakthrough by Sandisk would be shared with the competitor best positioned to use it, and that any advantage it builds must be built outside the part of the business that generates 71.5% gross margins.
The number to watch is the share gap. Kioxia has been ahead of Sandisk on NAND revenue share, with the same wafers.
- ReportedSandisk and Kioxia co-develop the process technology and memory design and jointly own the result, and license each other whatever they develop independently that the joint work needs. The two companies then sell finished drives against each other into the same markets, with Kioxia at 15.3% of NAND revenue and Sandisk at 12.4%.TrendForce coverage of the Kioxia-Sandisk alliance in the AI NAND market, January 2026. Data from TrendForce shows that in Q3 2025 Samsung led with a 32.3% NAND market share, followed by SK hynix at 19.3%, Kioxia at 15.3% — surpassing Micron — and Sandisk at 12.4%. Sandisk and Kioxia have maintained a partnership spanning over 25 years, and even after Western Digital spun off Sandisk in 2025 the collaboration has strengthened; the two operate the world's largest NAND flash production sites in Japan, including the Yokkaichi and Kitakami fabs. On the technology front they co-developed BiCS FLASH 3D NAND, now in its eighth generation at 218 layers, with production of the tenth generation at over 300 layers set to begin in 2026 and Kioxia planning to repurpose its recently opened Kitakami K2 fab for the new node; BiCS8's 218-layer TLC 3D NAND features 35% higher cell current, 60% faster NAND I/O and a 50% boost in bit density through CMOS directly bonded to array and On Pitch SGD technology. Through the joint ventures the two share the costs of expensive semiconductor equipment and R&D, achieving economies of scale to compete with the South Korean memory giants. There is a clear split in market focus: Kioxia mainly supplies NAND to major Japanese and global electronics makers, while Sandisk commands the consumer storage segment and holds a strong position in enterprise SSDs across North America and overseas markets; despite deep integration on the manufacturing side, the two continue to compete directly in channels and branded end products. ETNews reported that Sandisk planned a 100% NAND price hike in the new year, and Kioxia's market value topped 10 trillion yen on 27 January 2026, just over a year after its December 2024 IPO. — 2025-2026 · publ. 2026-01-29 · source ↗
- ReportedThe two companies then sell finished drives against each other into the same markets, with Kioxia at 15.3% of NAND revenue and Sandisk at 12.4%. So the technology dimension of competition between the industry's third- and fifth-largest producers is, by construction, a tie.TrendForce coverage of the Kioxia-Sandisk alliance in the AI NAND market, January 2026. Data from TrendForce shows that in Q3 2025 Samsung led with a 32.3% NAND market share, followed by SK hynix at 19.3%, Kioxia at 15.3% — surpassing Micron — and Sandisk at 12.4%. Sandisk and Kioxia have maintained a partnership spanning over 25 years, and even after Western Digital spun off Sandisk in 2025 the collaboration has strengthened; the two operate the world's largest NAND flash production sites in Japan, including the Yokkaichi and Kitakami fabs. On the technology front they co-developed BiCS FLASH 3D NAND, now in its eighth generation at 218 layers, with production of the tenth generation at over 300 layers set to begin in 2026 and Kioxia planning to repurpose its recently opened Kitakami K2 fab for the new node; BiCS8's 218-layer TLC 3D NAND features 35% higher cell current, 60% faster NAND I/O and a 50% boost in bit density through CMOS directly bonded to array and On Pitch SGD technology. Through the joint ventures the two share the costs of expensive semiconductor equipment and R&D, achieving economies of scale to compete with the South Korean memory giants. There is a clear split in market focus: Kioxia mainly supplies NAND to major Japanese and global electronics makers, while Sandisk commands the consumer storage segment and holds a strong position in enterprise SSDs across North America and overseas markets; despite deep integration on the manufacturing side, the two continue to compete directly in channels and branded end products. ETNews reported that Sandisk planned a 100% NAND price hike in the new year, and Kioxia's market value topped 10 trillion yen on 27 January 2026, just over a year after its December 2024 IPO. — 2025-2026 · publ. 2026-01-29 · source ↗