When Japan's NAND leader said prices had risen far enough, Taiwan's module makers countered 'this time is different,' the US market believed Kioxia, and Korea's export data ignored both — the 72 hours the four-country memory chain split on direction
The Three Days That Split
Between September 10 and 12, 2026, the four countries of the memory chain answered the same question in opposite directions. The question is simple — has the HBM/DRAM/NAND rally hit its peak?
Japan answered first. Kioxia (285A) publicly stated that memory price increases had 'gone far enough' (漲夠了), a comment Taiwan's technews immediately headlined as a remark 'rattling the global semiconductor market.' The company that is Japan's NAND #2 and — after its H1 2026 market-cap surge — the icon of the country's semiconductor revival was calling its own top. Musha Research's same-week note titled 'Kioxia's market-cap leadership signals a Japanese semiconductor revival' hit the market in the exact opposite direction.
The US market believed Kioxia. Micron (MU) lost $57 billion in market cap in a single week (24/7 Wall St., Barron's), under the headline 'the shortage behind its boom is getting worse.' On the same day, Asia Business reported that Micron is aiming at 100,000 HBM units per month to challenge the Samsung–SK Hynix duopoly. The US reaction is therefore two-layered: surface-level 'demand peak,' underlying 'supply is about to explode.' If Micron actually fills the 100k HBM slot, Kioxia's peak call becomes right after the fact.
Taiwan answered in the opposite direction. Team Group (十銓) issued a statement that 'this memory uptrend is structurally different and here to stay' (technews, Liberty Times). Taiwan's 891 OTC tech names reported August revenue of NT$364.4B, up 47% YoY, with semis at +96%. TSMC (2330) confirmed August revenue at +53% YoY. In the same window, NVIDIA (NVDA) subscribed to $3.5B in MediaTek (2454) convertible bonds — days before SEMICON Taiwan and the same week Google's CTO toured the Taiwan AI supply chain. Taiwan's rebuttal did not come as words; it came as capital.
Korea's data ignored both stories. August semiconductor exports: $38.2B, YoY +203.08%. First ten days of September: $35B, YoY +270% (Yahoo!ニュース). In the very week Kioxia said 'peak,' Korea posted the highest export print in its history. DDR5 16Gb spot held at $54.33 on Sept 12 — roughly 6x normal. Samsung Electronics targeted 40%+ HBM share for Q4. Foreigners and institutions kept accumulating Samsung and SK Hynix while retail capitulated with ₩14T in net selling (News2Day).
Four Clocks, Out of Sync
The fracture reveals four national clocks running at different speeds.
Japan's clock is set to margin. Kioxia said 'enough' because NAND margins had already recovered, and further increases invite customer defection. The Hyogo prefecture's 100,000-supplier ecosystem (Nikkei Veritas) and Applied Materials Japan's emphasis on 'new materials as the competitive axis' underline that Japan already believes it has won on the materials/equipment axis. There is no reason to press on the sell-side.
The US clock is set to GPU cost-of-goods. Yahoo Finance's read — 'the HBM shortage strengthens Micron's hand but pressures NVIDIA's GPU economics' — is the diagnosis. In the same week Jensen Huang answered circular-financing concerns with a '$100B backlog,' Huawei's Ascend 950DT saw prices jump on HBM scarcity. The US market fears the moment memory becomes GPU's cost bottleneck. Micron's drawdown was read not as 'memory company bad' but as 'AI-margin compression has begun.'
Taiwan's clock is set to the packaging cycle. TSMC's STCO (System Technology Co-Optimization) launch, the probe-card leader's exclusive orders on Vera CPU and Mellanox, and the TSMC–ASML 12-inch photomask roadmap — Taiwan is currently booking the next three years of capacity. Team Group's 'this time is different' is not the sentiment of a DRAM module maker; it is the confidence of a downstream packaging complex that has already sold through 2027.
Korea's clock is set to export prints. +203% is not up for debate. The question is whether the number reflects 'demand remains strong' or 'customers are front-loading inventory.' On the same day DeepSeek unveiled an ultra-low-cost AI model that cuts HBM and SSD usage, KAIST-Panesia-Meta demonstrated a 960-accelerator unified compute architecture — the software-lowers-hardware-demand axis and the hardware-scales-larger axis are running simultaneously.
Position — Whose Clock Is Right?
Kioxia's peak call will be adjudicated within 3–6 months, on three variables.
First, does Micron's 100k HBM actually ship? If yes, Kioxia is right; if the ramp slips, Team Group is right. Second, does CXMT's claimed 82% margin (Seoul Economic) get confirmed in actual price prints? If real, China lifts the floor and the peak delays. Third, do Korea's October exports hold +200%? If they hold, it is real demand; if they crack, it was inventory pull-forward.
From a positioning standpoint, the split answer across four countries is actually opportunity. Japan materials/equipment (Applied Japan, Shin-Etsu), Taiwan packaging downstream (2379 Realtek, 3711 ASE), Korea HBM leaders (000660), and a US Micron pair trade — these four run on different clocks, so there is no reason to bet the entire book on one direction. The real risk is trusting only one country's clock. The moment Kioxia called the cap was the moment the four-country chain began walking, for the first time, in four different directions.
Key Sources: - Kioxia says 'memory has risen enough,' rattling global markets (technews, 2026-09-12) - Wall Street Just Erased $57 Billion from Micron (24/7 Wall St., 2026-09-11) - Team Group: Memory price uptrend is different this time (technews/Liberty Times, 2026-09-11) - Korea semiconductor exports surge 270% in early September (Yahoo!ニュース, 2026-09-11) - Micron's HBM 100k gambit vs Samsung-SK Hynix duopoly (Asia Business, 2026-09-11) - plus 12 more
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