China’s CXMT (China Changxin Storage Technology) was listed on the Shanghai Stock Exchange on July 27. Its stock surged 465% on its first day of trading, with its market cap surpassing $500B, rattling U.S. memory and storage-related stocks: Micron shares fell 5%, SanDisk shares fell by about 12%, and Western Digital shares also dropped sharply; SK hynix also saw a steep plunge that day.
CXMT IPO’s impact on U.S. memory stocks: MU down 5%, SNDK down 12%
CXMT’s stock jumped 465% on its first trading day, reflecting investors’ confidence in Beijing’s push to build globally competitive memory companies. Theodore Shu, CEO of Yi Capital, told CNBC that CXMT “will undoubtedly grow into a global leader.” The news triggered a sell-off in U.S. memory stocks that same day: MU fell 5%, SNDK fell by about 12%, WDC slid sharply, and SK hynix also plunged; analysts said investors are re-assessing the entire memory trading market.
In addition, Korea Investment Securities (KIS) issued a warning in early July, saying SK hynix’s Q2 earnings expectations were 8% lower than the market’s estimate, reflecting that HBM4 chip shipment volumes were below expectations.
Why SNDK and WDC stocks were dragged into the move
CXMT focuses on DRAM memory, which is in a different market from SNDK’s NAND flash and WDC’s hard drive business. Analysts said the sell-off in SNDK and WDC “seems somewhat excessive.” There are two key reasons tying these two stocks together: investors are worried that China could replicate success in the DRAM space into other storage markets such as NAND flash; and there have been reports that Apple is testing DRAM chips supplied by CXMT, raising concerns that Chinese-made memory could enter large customers faster than expected.
Before the decline on July 27, MU, SNDK, and WDC had all surged on the back of AI infrastructure spending and tight supply; some profit-taking pressure also amplified the size of that day’s drop.
Hedge fund holdings and short interest data: overview of institutional participation in three memory stocks
According to Insider Monkey’s hedge fund database, as of the end of Q1 2026 (before CXMT’s development), the holdings were as follows:
MU (Micron Technology): 154 holding funds (from 137 in the prior quarter); shorted shares: 36.21 million (3.22% of shares outstanding)
SNDK (SanDisk): 114 holding funds (from 75 in the prior quarter, largest increase); shorted shares: 7.86 million (5.32% of shares outstanding)
WDC (Western Digital): 83 holding funds (from 79 in the prior quarter); shorted shares: 23.26 million (6.76% of shares outstanding)
The above data indicate that before CXMT’s listing, hedge funds had been preparing for an upcycle in the memory and storage industry; short sellers were comparatively more cautious.
FAQ
How did CXMT perform on its first day, and what impact did it have on stocks like Micron?
CXMT listed on the Shanghai Stock Exchange on July 27, 2026, and its stock surged 465% on the first day, with its market cap surpassing $500B; on the same day, MU fell 5%, SNDK fell by about 12%, and WDC and SK hynix also dropped sharply, as investors re-evaluate valuation across the entire memory trading market.
What share does CXMT currently have in the global DRAM market, and how does it compare with Micron?
According to CXMT’s IPO prospectus, its DRAM market share was about 7.7% by 2025; Counterpoint Research data show it reached about 8% in the first quarter (nearly triple year over year); Nomura expects it could grow to around 18% by the end of 2028. By comparison, Micron currently holds about 22% of the DRAM market and has a 21% share in the HBM market—CXMT currently has no HBM revenue.
Why were SNDK and WDC also hit by CXMT’s listing?
Analysts said SNDK (NAND flash) and WDC (hard drives) are in different markets from CXMT’s DRAM business; the sell-off mainly reflects investors’ concerns that China could expand DRAM success into other storage markets, and concerns that Apple is reportedly testing CXMT chips that could lead to adoption by large customers. Also, before this, all three stocks had already risen sharply due to AI demand, and profit-taking pressure further magnified that day’s decline.
