Kioxia's 332-Layer NAND Breakthrough Ignites 19% Rally as AI Memory Super-Cycle Takes Hold
Published on 07/04/2026 at 18:13 | Redaktion boerse-global.de
A record-breaking chip specification sent Kioxia shares rocketing 18.77% on Friday to close at €465.00, marking one of the stock's sharpest single-day gains this year. The trigger was the confirmation that mass production of the company's tenth-generation 3D flash memory had begun — a device packing an unprecedented 332 layers.
The new BiCS10 1Tb TLC 3D NAND, developed jointly with Western Digital (formerly SanDisk through the same joint venture), delivers a 59% improvement in bit density over the previous BiCS8 generation. Interface speed jumps 33% to 4.8 gigabits per second, while write power consumption drops 18% and read power consumption falls 30%. Another version of the chip — using the Circuit Bonded on Array architecture — achieves 512 gigabits per die with a 40% power reduction versus its predecessor and an 18-nanosecond read latency, features specifically optimised for AI inference workloads in data centres.
Production is already rolling at the Kitakami Fab2 facility in Iwate Prefecture, which came online in September 2025. Rather than ramping up the eighth generation as originally planned, Kioxia skipped straight to the tenth. The company has also extended its long-running partnership with Western Digital through December 2034, ensuring joint manufacturing capacity for the next decade.
Should investors sell immediately? Or is it worth buying Kioxia?
That capacity is already under severe strain. Kioxia's NAND and SSD output is fully booked for the remainder of 2026, and the firm aims to lift monthly wafer output at Kitakami to 10 million units by the fourth quarter of 2026. Over a longer horizon, it plans to double total production capacity by 2029. For the current financial year, management forecasts revenues of ¥4.5 trillion and an EBITA of ¥920 billion, with earnings per share pegged at ¥21.7 and a market capitalisation around ¥45.5 trillion.
The stock's trajectory has been breathtaking. Friday's close sits just 10.56% below the 52-week high of €519.90 reached on 30 June 2026, while the 50-day moving average of €243.20 is now trailing the current price by 91.20%. From the March low of €95.00, the shares have surged 389.47%. The 14-day relative strength index stands at 65.5 — elevated but not yet in overbought territory. Over 30 days, annualised volatility has hit 162.90%, reflecting the intense speculative energy around the AI hardware supply chain.
Kioxia's leap comes amid a broader renaissance in Japanese semiconductors. Rival Micron broke ground the same day on a ¥1.5 trillion expansion of its Hiroshima plant, backed by up to ¥536 billion in government subsidies. Market observers are calling it a "memory super-cycle" fuelled by structural demand for AI inference storage, with the overall memory market expected to grow at a compound annual rate of 7.3% through 2029. Kioxia has targeted a revenue share of over 60% in the data-chip segment by 2028, betting that its power-efficient high-performance NAND will keep it ahead of Samsung and SK Hynix as they also scale up.
The big question is how quickly competitors can narrow the layer-count gap. With the Kitakami ramp and the extended Western Digital tie-up, Kioxia has locked in its production base for years. Whether Friday's spike marks the start of a sustained leg higher — or merely another volatile swing in a 162%-volatility stock — depends on execution hitting those 10 million monthly wafers by late 2026.
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