Why are Samsung, SK Hynix and CXMT shares falling despite reported strong AI demand?

CXMT closed down 2.8% at 46.99 yuan, or US$7.01. Its shares were about 14% below their close before China’s National Day holiday, the SCMP reported. The Kospi closed down 5.5%, after falling more than 7% during the session; Samsung and SK Hynix together represented about half of the index’s weight.

Why did memory stocks fall while demand remained strong?

The declines came alongside what the SCMP described as strong quarterly earnings across the sector and soaring memory prices. Its account does not provide company-specific earnings figures or a quantified supply forecast, but it says investors are weighing current results against the possibility that memory-price growth could slow if supply catches up with demand.

A concern about the pace of future price increases is not evidence that prices have already turned or that buyers have reduced their orders. The reporting describes a risk to the durability of memory profits, not a confirmed decline in AI demand or a settled forecast for the companies’ future earnings.

The risk is not quantified in the available coverage. It does not say when supply might catch up, how much prices could change, or what effect a slowdown would have on Samsung’s or SK Hynix’s results. Those gaps make it impossible to read the share moves as a measure of how much demand has changed.

There is also a wider financing question. Semafor reported that concerns about funding the AI data-center buildout were contributing to caution toward technology stocks. Its examples included a downgrade to the outlook for U.S. technology-driven stocks by BlackRock’s research arm, the withdrawal of an initial public offering by an Australian data-center operator backed by Nvidia, and bond investors demanding higher premiums on technology-company debt.

Those examples indicate that scrutiny reaches beyond demand for chips to how the infrastructure behind AI is paid for. But Semafor’s reporting does not quantify the effect of financing concerns on memory purchases or establish how much they contributed to the falls in the three companies’ shares. The reports offer no breakdown of the declines by cause.

The Kospi’s drop shows the broader market relevance of the moves in Samsung and SK Hynix, given their combined share of the index. It does not show that the companies’ operations or earnings outlook changed on Tuesday. The cited reporting establishes no company response to the share declines or updated earnings forecast.

What does CXMT’s reported progress add?

CXMT’s reported technical progress adds a competitive issue to the backdrop, but the available evidence does not establish that it caused the sell-off. The SCMP’s report on CXMT’s chip structure said the company reported progress on a 4F² design for DRAM, or dynamic random-access memory. The notation describes a cell area of four square F, with F representing the minimum semiconductor line width; the design aims to fit more cells on a chip.

CXMT President Cao Kanyu said the company planned to roll out a server-memory product using the structure by the end of 2026, according to the SCMP. That is a company target, not confirmation that the product has launched or entered mass production. The reporting supplies no independent performance results or evidence of customer adoption.

The reports therefore add a possible source of competitive pressure without showing how quickly CXMT could challenge Samsung or SK Hynix in particular memory segments. The share declines alone cannot establish that CXMT’s technology is ready for commercial production or that it has changed the established companies’ prospects.

What can the share slide tell investors?

The figures document a sharp fall in the three companies’ shares, while the explanations in the reporting remain possible pressures rather than a proven accounting of causes. For Samsung and SK Hynix, the five-session declines were steeper than Tuesday’s losses alone; CXMT was also down on the day and compared with its pre-holiday close.

The tension is between strong results and prices reported now, and uncertainty about how long they can persist. Slower price growth if supply catches up is a risk described by the SCMP, while concerns about financing AI infrastructure appear in Semafor’s account of broader technology-stock caution. Neither report establishes that those risks have already reduced memory demand.

The evidence that could clarify the outlook is missing from these reports: a quantified supply-and-demand forecast, more detail on memory prices and company earnings, and independent evidence of whether CXMT can deliver its planned server-memory product at commercial scale. For now, the share slide shows pressure on investor expectations, not a verdict on the chip makers’ future results.