While hundreds of new commercial drone companies appear every month, Motley Fool identifies four publicly traded chip makers as stocks to watch for drone investors.  Motley names Ambarella (NASDAQ:AMBA), NVIDIA (NASDAQ:NVDA), Intel (NASDAQ:INTC), and Qualcomm (NASDAQ:QCOM). Ambarella has had its ups and downs of late – mostly downs, as the stock has fallen dramatically since the … Continue reading Drone Companies: the Four Big Chip Makers