Samsung, SK Hynix Shares Plunge Over 7%, KOSPI Falls 6% As China's CXMT Claims Memory Chip Breakthrough

South Korean semiconductor stocks faced significant drops following Chinese chipmaker ChangXin Memory Technologies (CXMT) announcements of a potential breakthrough. The KOSPI index, a key benchmark, plummeted 6% on Tuesday, marking its largest single-day decline since July. Asian equities, excluding Japan, also declined by over 2%.

The sell-off came amid concerns that CXMT's next-generation DDR5 RDIMM server memory chip could challenge established players like Samsung Electronics and SK Hynix. At an industry conference, CXMT President Cao Kanyu revealed plans to introduce a chip utilizing the 4F² dynamic random-access memory (DRAM) architecture by year-end.

This technology promises to pack more computing power into a smaller chip area, potentially enhancing efficiency in data center servers. CXMT's President confirmed these remarks in a subsequent statement, though the technology has not been independently verified or detailed. Samsung and SK Hynix shares fell over 7% each in South Korean trading, mirroring a 4% drop in US memory chipmaker Micron Technology.

CXMT's announcement highlighted China's push to bolster domestic semiconductor capabilities despite American restrictions on advanced chipmaking equipment. The development, if verified, could signify a major technological leap for the Chinese manufacturer. The company recently expanded its industry footprint with a major IPO during the summer.

Meanwhile, increasing demand for artificial intelligence (AI) infrastructure has spurred substantial investment in semiconductor manufacturing, though concerns about concentrated spending and uncertain returns have periodically unsettled investors. CXMT's latest claim has introduced another layer of competitive uncertainty to an industry vital for global AI development.