Micron Technology shares fell Monday, October 12, as Chinese memory maker ChangXin Memory Technologies (CXMT) released a next-gen DRAM design that could reshape the global memory-chip landscape. Micron (MU) stock dropped 3.58% to $992.21 in early trading, down roughly 15% from its June all-time high.
South Korean rivals also tumbled, with SK Hynix down 4.52%, Samsung Electronics losing 4.39%, and the KOSPI index falling 3.5%. The selloff followed CXMT's announcement over the weekend that it had achieved "key progress" on a new memory-cell architecture focusing on increasing storage density - a field where the world's largest memory makers are racing to dominate.
The "4F²" structure is at the heart of the innovation, in which each memory cell occupies an area of four squares of F, where F is the smallest line width of a semiconductor device. This allows for packing more memory cells into a single chip, resulting in higher storage density.
Currently, mainstream DRAM chips use the 6F² cell structure. Switching to 4F² represents a paradigm shift from horizontal to vertical transistor channels.
According to CXMT, the secret lies in the Vertical Surrounding Gate transistor, which employs a vertical gate structure to solve leakage issues while drastically decreasing unit area. CXMT President Cao Kanyu stated the company aims to unveil new server memory solutions based on this architecture by the end of 2026, including next-generation DDR5 RDIMM.
This architecture can increase memory density by 30%-50%. SK Hynix previously outlined a roadmap for 4F² in 2025, while Samsung is reportedly targeting mass production of sub-10 nanometre DRAM by 2028.
Additionally, Micron faces labor challenges in Taiwan, where unions are demanding a 15% share of operational profits as a quarterly bonus. Taiwan accounts for over 80% of Micron's workforce.
The broader semiconductor industry remains under pressure, with options markets for chip ETFs showing a heavy put-bias. Industry experts note that supply chains are undergoing structural shifts as new geopolitical and technological realities reshape international trade dynamics.
Market analysts are closely monitoring these developments as memory chip prices fluctuate across global exchanges, impacting both institutional investors and retail traders alike. Further updates from regulatory bodies and industry associations are expected later this week as companies prepare for upcoming quarterly earnings reports.