Acm Research is trading 7.8% down at $56.35, extending its recent slide as broad semiconductor weakness weighs on chip stocks. - Sector concerns include Chinese competition following CXMT’s reported memory-chip progress, doubts about AI infrastructure spending, and elevated valuations. - Inflation concerns and higher-rate worries add to the risk-off backdrop, but available evidence points chiefly to sector-wide semiconductor weakness, not a new company-specific announcement.