Samsung, SK Hynix Shares Plunge Over 7% as KOSPI Drops Nearly 7% on China Competition Fears

3-line summary

• Samsung Electronics fell about 7.5% to 231,750 won and SK Hynix fell about 8.4% in Tuesday Asian trading, extending what the article describes as a fifth straight down session; the KOSPI index dropped nearly 7% to 5,944.31, according to Investing.com.
• The selloff traces to news that China's CXMT (ChangXin Memory Technologies) has made progress on next-generation 4F² DRAM design, which could boost memory density, with CXMT reportedly targeting a 2026 year-end launch of server DDR5 products using the technology — raising concerns over intensifying competition and pricing pressure.
• The decline also followed Monday's drop in US chip stocks (Micron down roughly 4%, SanDisk down roughly 6%), amid broader concerns over the sustainability of the AI investment boom and elevated valuations in the memory sector.

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