Memory-chip shares fell sharply in U.S. trading on Monday after China’s largest DRAM producer, ChangXin Memory Technologies, made a blockbuster debut on Shanghai’s STAR Market, prompting traders to reassess how aggressively the newly funded company could expand supply in the years ahead.
SanDisk was the hardest hit, falling as much as 14.6% during the morning before closing about 11% lower. The move extended its decline to roughly 47% from its June 22 record high, erasing about $170 billion in market value over the past month, according to the figures provided in the market report.
Other storage and memory names also came under pressure. SK Hynix’s U.S.-listed ADR dropped about 10% intraday and ended down 7.5%. Western Digital closed 4.2% lower after falling more than 9% at its session low, while Seagate Technology lost 4.1% and Micron Technology finished down 2.3% after trading more than 7% lower earlier in the day.
The selling briefly dragged the Philadelphia Semiconductor Index down about 5%, although the index recovered part of the loss to close 2.2% lower. The broader damage was more limited: the S&P 500 fell about 0.4% at its low, the Nasdaq declined about 0.8%, and the Dow remained positive through the session.
CXMT’s debut puts future DRAM supply in focus
CXMT shares closed 465.82% above their offering price in their first day of Shanghai trading, giving the company a market capitalization of 3.28 trillion yuan, or roughly $460 billion at the exchange rate implied by the report. That valuation placed the company ahead of Industrial and Commercial Bank of China and near the combined value of two Kweichow Moutai companies, according to the figures cited.
The initial public offering raised about 57.9 billion yuan, equivalent to approximately $8.6 billion. The deal was described as Asia’s largest IPO fundraising event this year. Turnover in CXMT shares exceeded 140 billion yuan during the first session, making it the first A-share — a mainland China-listed stock denominated in yuan — to surpass 100 billion yuan in single-day trading value.
The market reaction in the United States reflected concerns about the longer-term DRAM supply cycle rather than a sudden change in quarterly earnings expectations for Micron, SK Hynix, SanDisk, Western Digital, or Seagate. A heavily funded CXMT would have more room to add manufacturing capacity, develop newer products and compete more directly in parts of the memory market that have historically generated large profits for established producers.
DRAM, or dynamic random-access memory, is used across PCs, smartphones, servers, vehicles and other electronics. Memory producers often face sharp swings in profitability because new capacity can take years to build, but additional output can eventually push prices lower when demand slows or production exceeds consumption.
CXMT was founded in 2016 and currently produces DDR4 and DDR5 memory products for consumer electronics, personal computers, servers and automotive systems. The company is also developing DDR5-related technologies, placing it in a segment where demand is supported by conventional computing hardware as well as expanding data-center infrastructure.
AI memory remains a separate competitive battleground
The sharp share declines did not erase the technological gap between conventional DRAM and high-bandwidth memory, or HBM. HBM stacks memory chips vertically to deliver the fast data transfer needed by advanced artificial-intelligence processors. Micron, SK Hynix and Samsung remain the leading suppliers in that segment, where demand from AI server deployments has supported stronger margins than in mainstream DRAM.
CXMT’s new capital could strengthen its position in standard memory products, but the company faces a more difficult route into HBM. U.S. export restrictions limit Chinese companies’ access to some advanced semiconductor equipment and technologies needed for leading-edge memory production. Those restrictions create a practical obstacle for any near-term effort by CXMT to challenge the established HBM suppliers directly.
That division helps explain why Micron’s intraday decline was substantial but its closing loss was smaller than the drops recorded by several storage-focused peers. Micron has exposure to the conventional DRAM market, where CXMT’s growth could eventually increase competition, but it also has a major position in HBM and data-center memory tied to AI systems.
The selloff also spread to Western Digital and Seagate, whose core businesses are more closely associated with storage drives than DRAM manufacturing. Their declines suggest the market treated the session as a broader reassessment of memory and data-infrastructure valuations, rather than a narrowly targeted judgment on one producer’s immediate sales outlook.
Bernstein analyst Mark Li projected that global memory-chip market revenue could exceed $1.3 trillion in 2027 and 2028, driven by continued data-center construction and demand for both standard DRAM and HBM. That forecast leaves room for the overall market to expand even if competition becomes more intense, though it also raises the stakes around which companies can keep production disciplined as new financing enters the sector.
Monday’s trading placed CXMT’s IPO at the center of the DRAM debate: the company’s exceptional valuation gives it financial firepower, while the incumbents retain stronger positions in the most advanced AI-memory products. The next test for memory shares will be whether CXMT converts its market debut into meaningful additions to manufacturing capacity and whether demand from servers, PCs and AI infrastructure remains strong enough to absorb that output.
Worried about volatility after CXMT’s debut? Learn how crypto markets react to macro shifts in this market-cycle guide.
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