China's CXMT Challenges Korea's Memory Chip Lead as AI Demand Raises the Stakes

A 5 Percent Challenger Enters a Market Led by Three Giants

China's ChangXin Memory Technologies, known as CXMT, has reached about 5 percent of the global DRAM market and is preparing a $4.2 billion initial public offering on the Shanghai Stock Exchange after becoming profitable for the first time in 2025. As of February 3, 2026, its advance is putting fresh pressure on South Korea's Samsung Electronics and SK Hynix, even as those companies benefit from booming demand for memory used in artificial intelligence.

Counterpoint Research figures for the third quarter of 2025 put SK Hynix at 34 percent of global DRAM sales, Samsung at 33 percent and US manufacturer Micron Technology at 26 percent. Together, the three held 93 percent. CXMT's share rose from 3 percent in late 2024 to 5 percent, an increase of two percentage points in a market that established suppliers have dominated for decades.

DRAM is the working memory that computers use to hold information while carrying out tasks. High bandwidth memory, or HBM, is a more demanding form of DRAM that stacks chips vertically so large amounts of data can move quickly to processors. That speed makes it especially valuable for training large language models and running advanced AI applications.

Korean manufacturers retain an estimated lead of two to three years in standard DRAM and three to four years in HBM. Their advantage is being tested by Chinese state investment, aggressive pricing and a growing domestic customer base. The contest also involves US restrictions on equipment and advanced memory, along with a South Korean criminal case alleging that former employees passed manufacturing secrets to CXMT.

South Korea's semiconductor exports nevertheless increased 22.2 percent in 2025 to a record $173.4 billion. The immediate picture is therefore one of rising business alongside rising competition: Korean suppliers are selling more, while a Chinese challenger is gaining the ability to make products that were previously beyond its reach.

State Funding Supports CXMT's Expansion

CXMT was founded in 2016 and has grown from a negligible supplier into China's leading challenger in DRAM. Its first profitable year in 2025 and planned Shanghai listing mark a shift from building manufacturing capability toward establishing a larger commercial business. The proposed $4.2 billion share sale would provide another source of funding for that expansion.

China's National Integrated Circuit Industry Investment Fund, commonly called the Big Fund, has supported the country's push for semiconductor self sufficiency. The program is described as having accumulated capital exceeding 690 trillion yuan, alongside an approximate dollar figure of $95 billion. Its third phase, launched in 2024, targets advanced AI chips, HBM development and a stronger semiconductor supply chain.

CXMT's IPO prospectus describes a transition from early development to volume manufacturing. The company recently announced mass production of DDR5 and LPDDR5X memory for personal computers, servers and mobile devices. DDR5 is a newer generation of standard computer memory, while LPDDR5X is designed for devices where power consumption matters.

Lee Jong-hwan, a professor of system semiconductor engineering at Sangmyung University, described China's chip ambitions as part of its wider strategic competition with the United States:

The technology gap with China is evident. But China's ultimate goal is not short term profitability. Its chip ambition is directly linked to its competition with the US, including AI and military capabilities.

Beijing's investment therefore supports several goals at once: building a domestic industry, reducing reliance on foreign technology and supplying computing systems used for AI and military capabilities. CXMT's commercial progress sits within that larger national effort.

How Far Apart Are the Manufacturing Technologies?

The National Academy of Engineering of Korea estimates that China's standard DRAM technology trails the leaders by roughly two to three years. That is much narrower than the previous gap of about a decade, although successive manufacturing generations still bring meaningful gains in efficiency and performance.

Korean manufacturers and other global leaders have moved into fifth and sixth generation processes in the 10 nanometer class, known as 1b and 1c. Chinese firms mainly operate at the earlier 1z generation, within sub 20 nanometer technology. These labels describe generations of manufacturing processes rather than the performance of a complete memory product.

More advanced processes allow manufacturers to fit more memory into a given area, improve power efficiency and reduce production costs at scale. Earlier processes can produce larger chips with lower yields. Yield means the share of manufactured chips that work correctly and can be sold, so a lower yield makes each usable chip more expensive.

TechInsights analysis indicates that CXMT can manufacture DRAM at the D1y and D1z nodes, corresponding to approximately 17 to 13 nanometers. Its DDR5 technology has reached density comparable to leading competitors' products from 2021. Teardown analysis of its 16Gb DDR5 products places their bit density near Micron's 2021 products, although CXMT's chips have larger die sizes.

CXMT's yield rates have not been verified. Larger dies and the uncertainty around yields point to potentially higher manufacturing costs, even when the products can serve similar uses. Matching a memory specification and producing it cheaply in large quantities are different stages of the same industrial challenge.

CXMT is also reportedly developing D1α and D1β processes below 15 nanometers, which are essential to its ambitions for HBM3E. Micron achieved D1α in 2021 without extreme ultraviolet lithography, providing a precedent for advancing that far without the most advanced exposure equipment.

HBM Keeps Korea Ahead in the AI Race

Korean chipmakers first commercialized DDR5 memory in 2020. They are now shipping fifth generation HBM3E products to major AI customers and preparing the next generation, HBM4. CXMT began mass production of HBM2 in late 2024 and aims to produce HBM3 class products by 2026, with HBM3E potentially following in 2027.

HBM production requires more than making individual DRAM chips. Manufacturers stack the chips vertically and connect them using through silicon vias, tiny connections that pass through the silicon. This arrangement moves data rapidly while improving power efficiency, but it also creates difficult engineering work involving alignment, heat and reliable connections.

Korean suppliers' advantage rests on stacking precision, thermal control and stable production yields, developed through years of collaboration with AI chip designers. Managing heat matters because densely packed chips must keep working reliably while moving large amounts of data. Stable yields matter because a problem in one part of a stack can affect the finished product.

Counterpoint's third quarter figures put SK Hynix's HBM share at 57 percent, Samsung's at 22 percent and Micron's at 21 percent. Samsung reached that share after struggling with restricted exports to China during the first half of 2025. The figures show how geopolitical restrictions can affect sales even when the underlying technology remains competitive.

Suppliers have reportedly sold out of HBM products through 2026 as AI demand continues to rise. That demand gives the established manufacturers substantial business while CXMT works toward newer generations. Its proposed schedule would bring it closer, but the estimated gap in HBM remains three to four years.

China's NAND Progress Shows an Uneven Contest

China's progress is also visible in NAND flash memory, which stores information rather than serving as a computer's temporary working memory. Samsung and SK Hynix currently mass produce NAND chips with 286 to 321 layers, while China's Yangtze Memory Technologies, or YMTC, has reached 232 layers.

Adding layers allows manufacturers to build more storage vertically. The difference in layer counts places Korean suppliers ahead on that measure, although the competitive picture also depends on how the layers and other parts of a chip are joined.

YMTC has developed hybrid bonding technology considered more advanced than that of Korean rivals in certain applications. Hybrid bonding joins chip components through closely aligned connections. Its progress shows that a company can trail in one broad manufacturing measure while developing a stronger technique in a particular area.

DRAM, NAND and HBM therefore present different competitive gaps. China has made advances across memory manufacturing, but the most demanding HBM production still gives Korean suppliers their strongest technological advantage.

Prosecutors Allege Manufacturing Secrets Reached CXMT

On December 26, 2025, South Korean prosecutors indicted 10 people, including former Samsung Electronics executives and engineers, over allegations that advanced technology for manufacturing DRAM in the 10 nanometer class was leaked to CXMT. Five suspects remained in custody, while five others were charged and released on bail.

The Seoul Central District Prosecutors' Office said the accused took key research and development positions at CXMT after leaving Samsung. Investigators alleged that one departing researcher copied hundreds of steps of proprietary DRAM process information by hand, including manufacturing sequences, equipment specifications and details used to improve yields.

Prosecutors said the handwritten notes were used to recreate and adapt Samsung's manufacturing flow at CXMT. They linked the alleged transfer to CXMT becoming China's first domestic producer of DRAM at 18 nanometers in 2023. The case concerns the practical instructions needed to make chips consistently, as well as the design of the chips themselves.

Prosecutors estimated Samsung's lost sales in 2024 alone at approximately 5 trillion won, or $3.56 billion, with potential consequences over a longer period reaching tens of trillions of won. The investigation also alleged that CXMT obtained additional DRAM technology from SK Hynix through a supplier.

The indicted individuals reportedly received annual salaries at CXMT three to five times their previous Samsung earnings, reaching billions of won a year. Those pay levels illustrate the competition for people with detailed manufacturing knowledge. The defendants face allegations in a criminal case; no trial outcome or next hearing date was given.

Shim Dae-yong, a professor at Dong-A University who spent 26 years overseeing DRAM business at SK Hynix, described the limits of relying on funding alone:

Semiconductor business is not something that can be mastered with money alone. The industry's rapid upgrade cycles mean legacy technologies quickly lose relevance after their peak, limiting the long term economic impact of dominance in lower end segments.

His assessment connects the legal dispute to the pace of technological change. Manufacturing knowledge can help a competitor advance, while the established companies continue moving to newer products and processes.

Low Prices Meet Growing Chinese Demand

CXMT has offered DDR4 DRAM at prices nearly half those charged by established competitors. The discounts help it attract customers and put pressure on the margins of Samsung, SK Hynix and Micron. Buyers further down the supply chain benefit from cheaper memory.

DDR4 belongs to an older product generation than DDR5. Success in that market gives CXMT revenue and customer relationships, while newer products remain central to its effort to compete in servers, mobile devices and AI systems. Its expansion from 3 percent to 5 percent of global DRAM sales shows that it has already gained ground.

Chinese cloud companies Tencent, Baidu and Alibaba were projected to spend a combined $31.98 billion in 2025, nearly 40 percent more than in 2024. Their spending provides a large domestic market for computing equipment and strengthens demand for memory as Chinese companies expand AI services.

Chinese AI demand also drove shipments of Nvidia's H20 chips above one million units before the ban. The demand for processors and the memory that supports them helps explain why access to advanced chips has become such a central issue in the technology contest between Washington and Beijing.

South Korea's record semiconductor exports in 2025 show that this demand is also supporting established suppliers. Price pressure in older memory and strong demand for advanced AI memory are occurring at the same time, giving different parts of the industry different commercial conditions.

US Controls Put Equipment and HBM Under Pressure

In December 2024, the United States introduced export controls targeting China's access to HBM and semiconductor manufacturing equipment needed for its production. The measures added more than 140 Chinese chip manufacturers and toolmakers to the Commerce Department's Entity List, which subjects listed businesses to restrictions on access to controlled technology.

The controls aim to constrain China's AI development by limiting access to advanced memory and the means to manufacture it. For CXMT, the pressure extends to support for equipment already installed: maintenance personnel from American semiconductor equipment companies working at its facilities were instructed to leave, affecting DRAM and HBM development schedules.

CXMT reportedly stockpiled enough equipment to sustain operations through 2026 or 2027. That gives it some capacity to continue manufacturing, while restrictions limit its ability to develop and expand more advanced production beyond current processes without access to extreme ultraviolet lithography tools.

Extreme ultraviolet lithography, usually shortened to EUV, uses extremely short wavelengths of light to create fine patterns on chips. Access to such equipment affects how efficiently manufacturers can produce advanced designs. Without it, CXMT may face difficulties improving yields and reducing die sizes below 15 nanometers, similar to those experienced by other Chinese foundries.

China's effort to develop domestic EUV equipment has reportedly produced a prototype intended to make working chips by 2028. Analysts place commercial production closer to 2030. Moving from a prototype to dependable factory equipment is therefore another part of the timetable facing China's memory industry.

CXMT remained outside the Entity List as of early 2026, although Washington had reportedly discussed adding it since January. Even without a listing, geopolitical tensions and the technology gap discourage foreign companies from choosing CXMT's HBM for their AI accelerators. Its potential customers remain primarily within China.

The Dates That Shape the Competition

CXMT's expansion combines milestones already reached with targets that still require manufacturing progress. The sequence shows both the speed of its development and the time needed to reach more advanced memory generations.

• 2016: CXMT was founded.
• 2020: Korean chipmakers first commercialized DDR5 memory.
• 2021: Micron achieved D1α manufacturing without EUV; CXMT's current DDR5 density is comparable to leading products from that year.
• 2023: CXMT became China's first domestic producer of DRAM at 18 nanometers, an achievement prosecutors later linked to allegedly transferred Samsung technology.
• 2024: China's Big Fund launched its third phase. CXMT began HBM2 mass production late in the year, and the United States introduced new HBM and equipment controls in December.
• 2025: CXMT became profitable for the first time. Its DRAM share reached 5 percent in the third quarter, and Korean prosecutors indicted 10 people on December 26.
• 2026: CXMT aims to produce HBM3 class products, while established suppliers' HBM output is reportedly sold out through the year.
• 2027: CXMT could move into HBM3E; its stockpiled equipment is expected to support operations through 2026 or 2027.
• 2028 and 2030: China's EUV prototype effort targets working chips by 2028, while analysts expect commercial production closer to 2030.

Samsung and SK Hynix are preparing HBM4 while CXMT pursues those targets. The competitive gap will depend on the Chinese company's progress and on how quickly the current leaders advance their own manufacturing.

Key Points

• SK Hynix, Samsung and Micron held a combined 93 percent of global DRAM sales in the third quarter of 2025; CXMT held 5 percent.
• CXMT first became profitable in 2025 and is preparing a $4.2 billion Shanghai IPO.
• Korean suppliers retain estimated leads of two to three years in standard DRAM and three to four years in HBM.
• CXMT targets HBM3 class production in 2026 and potentially HBM3E in 2027, while Korean suppliers ship HBM3E and prepare HBM4.
• South Korean prosecutors indicted 10 people over alleged technology transfers, estimating Samsung's lost sales in 2024 at 5 trillion won, or $3.56 billion.
• US equipment and HBM controls constrain China's expansion, while CXMT remained outside the Entity List as of early 2026.
• South Korea's semiconductor exports reached a record $173.4 billion in 2025, up 22.2 percent, despite growing competition.