With Memory chips (DRAM) down 4.1%, this looks like a sector-led move rather than a company-specific surprise.

Memory chip stocks fell sharply after China's ChangXin Memory Technologies (CXMT) announced significant progress on a new, denser DRAM design. This development is raising concerns among investors about the potential for increased competition and future pressure on memory chip pricing. News of CXMT's advancement, which could allow more memory cells per chip, led to pre-market declines in major memory producers like Micron, SanDisk, and SK Hynix. The sell-off is specific to the memory sector, as the broader market showed strength.