 Shares of Nautilus Inc. NLS, -20.84 plunged 20.5 in morning trading, putting them on track for the lowest close since March 2020, after the exercise equipment and digital fitness company swung to a fiscal fourth-quarter loss, as revenue that fell sharply from a year ago while gross margins were more than halved. The company also provided fiscal first-quarter sales guidance of 45 million to 55 million, which was well below the current FactSet consensus of 70.4 million, and consensus at the end of April of 114.6 million. 