On October 13, 2026, SK Hynix shares fell roughly 9% in Seoul. The sell-off followed an announcement from Chinese competitor ChangXin Memory Technologies (CXMT), which reported significant progress on a denser DRAM design and plans to ship server memory by the end of 2026.
The news stoked fears of stronger competition, potential oversupply, and pressure on memory-chip prices and profits. Semiconductor stocks broadly declined, including shares of Samsung Electronics, and the sell-off triggered a trading curb on South Korea’s KOSPI index.
The downturn also reflected existing concerns about high valuations for AI-related stocks and broader macroeconomic headwinds.