中国メモリー大手CXMTが過去最大級のIPO、国産DUV露光装置も量産へ——世界の半導体株に衝撃が走る

Founded in 2016, CXMT held a 7.67% share of the global DRAM market as of Q4 2025 . The company plans to use the IPO proceeds primarily for memory wafer mass production and R&D, with capacity expansion targets of roughly 300,000 to 380,000 wafers per month .

However, CXMT's prospectus split 29.5 billion yuan across three projects — DRAM technology upgrades, next-generation DRAM research, and memory wafer manufacturing line upgrades — with no dedicated project or disclosed funding commitment for high-bandwidth memory (HBM), a key growth segment dominated by SK Hynix and Samsung .

Domestic Immersion DUV: Breakthrough with Big Caveats

According to a report from The Information, a state-backed Shanghai manufacturer has begun mass-producing immersion deep ultraviolet (DUV) lithography machines, with first deliveries expected this year to SMIC, Hua Hong Semiconductor, and CXMT . The manufacturer has not been publicly named due to political sensitivities .

Production volumes are tiny compared to ASML's scale. China targets roughly 5 machines in 2026 and about 20 in 2027 . By comparison, ASML shipped 131 immersion DUV systems in 2025 alone . Reuters notes the Chinese tools still lag on performance and reliability and need further testing before mass adoption .

SMIC reportedly tested a Yuliangsheng immersion lithography system as early as September 2025 . Analysts have offered wide-ranging timelines for when Chinese DUV tools might become commercially competitive — from the mid-2030s for 7nm-capable immersion DUV to around 2040 for EUV .

Market Impact: Memory Stocks Hit Hard

Concerns that CXMT's expansion and China's growing chip tool capability will flood the DRAM market sent shares of rivals sharply lower.

• Micron Technology (MU) fell 8.9% on July 28 and was on track for its worst monthly drop in 11 years, down more than 29% in July .
• SK Hynix shares lost 14% in a single day, and its American depositary receipts fell 9% .
• Samsung Electronics fell as much as 13.4% during trading on July 28 .
• ASML shares fell roughly 11% following the DUV news, though JPMorgan analysts said damage even in the medium term will be limited .

South Korean markets were particularly rattled by the prospect that CXMT may also produce its own lithography equipment . US chip stocks also faced a broad sell-off, with SanDisk falling 11% and Nvidia declining 5% .

ASML: Caught in the Squeeze, But Moat Remains Intact

ASML is "caught in a US-China squeeze," as Reuters put it . The Dutch company's immersion DUV and EUV machines remain far superior in precision and throughput, and China's output is a rounding error compared to ASML's volume .

China accounted for around 29% of ASML's total sales in 2025, primarily through DUV machines and related services . The pending MATCH Act in the U.S. Congress would explicitly block ASML from selling to or servicing Chinese firms including SMIC, Hua Hong, Huawei, CXMT, and YMTC, potentially impacting 10–15% of ASML's overall sales .

Caveats and Analyst Perspective

Many analysts believe a meaningful challenge to the established DRAM "Big 3" (Samsung, SK Hynix, Micron) or to ASML is still years away . Key reasons:

• The DUV tool report is based on unnamed sources via The Information, and the machines are not yet in volume production or proven at scale in fabs .
• CXMT's prospectus contained no earmarked spending on HBM, meaning it cannot yet challenge the most lucrative and fastest-growing memory segment .
• Both CXMT and SMIC remain operationally dependent on stockpiled Western equipment and lack access to EUV lithography needed to close the yield and density gap with TSMC or SK Hynix .

Bottom Line

The market is pricing in a credible long-term competitive threat from China's chip self-sufficiency push, hitting memory stocks hard. But the actual near-term displacement of SK Hynix, Micron, or ASML remains very small — the sell-off is driven more by sentiment and fear of future capacity oversupply than by any immediate loss of market share.