Acm Research is trading 4.06% higher at $84.20 after its Shanghai subsidiary disclosed backlog growth. - Backlog was RMB 17.1 billion ($2.5 billion) as of September 29, up 88.2% year over year; shares gained 7.02% to $80.92 on September 30. - The release cautioned backlog may not translate into estimated revenue. No separate October 1 company announcement was found; broader indexes were slightly lower, and current volume data was unavailable.