Micron Technology shares fell in premarket trading Monday after China banned the semiconductor giant's chips. Reuters//Kai Pfaffenbach Micron shares fell 6% in premarket trading Monday after China banned its chips. Beijing ruled that the semiconductor giant's products posed a national security risk. Other US-listed chipmaking stocks also slipped, while some Chinese rivals gained. US semiconductor giant Micron Technology's stock price slumped in Monday's premarket after China banned its chips. The stock fell 6% to trade at $64 shortly before 6 a.m. ET after Beijing's latest move, with its Frankfurt-listed shares slipping the same amount Monday morning. Those losses came after...