Memory and storage stocks came under pressure on July 27 after China’s leading semiconductor manufacturer, ChangXin Memory Technologies (CXMT), delivered a blockbuster Shanghai stock market debut to surpass a $500 billion valuation.
Micron Technology, Inc. (NASDAQ:MU) shares fell 5%, Sandisk Corporation (NASDAQ:SNDK) declined around 12%, while Western Digital Corporation (NASDAQ:WDC) also traded sharply lower on Monday afternoon. SK Hynix shares also tumbled the same day, reinforcing the view that investors were reassessing the memory trade rather than only Micron’s exposure to CXMT.
CXMT’s 465% rally signals increased investor confidence in Beijing’s effort to build a globally competitive memory player. With China’s semiconductor industry rapidly closing the technology gap with global leaders, established memory manufacturers seem to be coming under rapid pressure.
I have no doubt the company is going to grow to be a global leader. It’s maybe just a question of time that it can be not only a challenger, it can be a global champion in this particular sector, said Theodore Shou, CEO at Yiyi Capital about CXMT on CNBC’s “Squawk Box Asia.”
CXMT Emerges as a Major Chinese Memory Player
According to CXMT’s IPO prospectus, the company had a market share of about 7.7% in 2025, making it the world’s fourth-largest DRAM maker behind Samsung Electronics, SK Hynix, and Micron Technology, Inc. (NASDAQ:MU).
A global memory-chip upcycle that began last year has fuelled its growth, backed by AI-related demand, boosting prices and spending on advanced memory products.
Everybody’s really confused about what’s going to happen to the memory demand and where the fair price is,” Daniel Yoo, global strategist at Yuanta Securities, said on “Squawk Box Asia.” “It’s all about how much demand is there versus how much supply is going to come in … [and] what kind of multiple you will be getting.”
According to analysts, this DRAM-chips manufacturer has the potential to expand its global market share amid rapid capacity growth and rising demand for artificial intelligence computing power. According to Nomura, a leading financial services group, CXMT’s share of the global DRAM market could rise from about 10 per cent now to about 18 per cent by the end of 2028.
CXMT offers a great opportunity for China as well. Currently, China accounts for roughly a quarter of global DRAM in 2025 while domestic production met only 30% of local needs. This gives CXMT room to expand in its home market.
Why CXMT Matters Most to Micron
Micron remains heavily exposed to the memory market, making CXMT’s rapid expansion difficult to ignore. According to Counterpoint Research, CXMT’s DRAM market share roughly tripled year over year to about 8% in the first quarter. While the rise still trails Micron’s roughly 22% share, the pace of growth makes CXMT a credible competitor. Plus, the fresh capital further paves the way for the company to close in the gap with Micron.
The greatest competitive threat for Micron Technology, Inc. (NASDAQ:MU) is likely to emerge in commodity DDR4 and DDR5 used in PCs, servers, and smartphones. While there are limits to this immediate risk considering how US sanctions continue to constrain CXMT’s access to advanced semiconductor equipment, they don’t shield the stock from broader pricing pressure. Faster Chinese capacity growth may weigh on conventional DRAM prices, making it difficult for Micron to sustain the strong margins it recently reported.
Why Sandisk and Western Digital Also Fell
CXMT specializes in DRAM memory, which is not the same kind of memory as Sandisk Corporation (NASDAQ:SNDK) makes. Sandisk specializes in NAND flash memory, which makes its sell-off today seem like an overreaction. Similarly, Western Digital Corporation (NASDAQ:WDC) is exposed to hard disk drives, which means the company doesn’t face the same competitive threat as Micron either.
Their declines, instead, are a reflection that China could replicate its DRAM progress in NAND and similar storage markets. Investors may also be worried that such an aggressive Chinese production expansion may create excess supply and weaken pricing across the memory industry.
Adding to the unease is the fact that Apple is reportedly testing DRAM chips supplied by CXMT, rising concerns that the Chinese memory could reach big customers sooner than anticipated.
Shares for the stocks also fell as investors locked in profits. Micron, Sandisk, and Western Digital Corporation (NASDAQ:WDC) had all generated substantial gains before Monday’s decline backed by AI infrastructure spending and limited supply which strengthened memory prices and margins.
Separate from the CXMT development, Korea Investment & Securities had already introduced another source of caution earlier in July. Brokerage KIS published second-quarter earnings estimates for SK Hynix, coming in 8% below market expectations.
The weaker forecast was a reflection of slower-than-anticipated HBM4 memory chip shipments and SK Hynix’s reliance on high-bandwidth memory contracts. These factors limit its ability to benefit from higher prices in the conventional DRAM market.
The Memory Rally May Have Room to Run
CXMT doesn’t threaten the entire memory and storage market equally. It generates no revenue from HBM for now, while Micron currently holds 21% of the HBM market. SK Hynix, in turn, is the category leader. CXMT is also constrained by US sanctions, which limits how quickly it can close its technological gap. Strong AI infrastructure demand and continued shortage of advanced memory can therefore still support industry pricing.
Hedge fund data and short interest figures available before CXMT’s listing shows that the memory rally had attracted significant institutional participation.
According to Insider Monkey’s hedge fund data base, Micron was held by 154 hedge funds at the end of the first quarter of 2026, up from 137 in the previous quarter. Sandisk Corporation (NASDAQ:SNDK) observed the largest increase, with hedge fund ownership rising from 75 in the previous quarter to 114. Meanwhile, Western Digital was held by 83 funds, up modestly from 79. The figures imply how hedge funds had been positioning for a memory and storage upcycle before the CXMT development.
Short sellers, on the other hand, narrate a more cautious outlook. MU’s short interest stands at an estimated 36.21 million shares sold short, or 3.22% of the public float. Sandisk’s stood at 7.86 million shares or 5.32% of the float, while WDC had 23.26 million shares sold short, or about 6.76% of its float.
Overall, Micron has been attracting the widest institutional participation because of its exposure to high-bandwidth memory and data-center demand. The contrast for Sandisk and Western Digital, however, reflects concerns regarding share price gains and durability of storage price increases.
For now, the figures reflect how the memory and storage rally was particularly vulnerable because institutional participation and expectations for the memory market were already elevated. While CXMT adds a long-term risk to DRAM pricing, it doesn’t yet undermine the near-term shortage of advanced memory or AI demand supporting Micron.
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