 Peloton Interactive Inc. shares PTON, -3.47 were tumbling in premarket trading Thursday after the maker of connected fitness equipment saw its losses narrow but forecast significantly lower revenue for the holiday quarter than analysts had anticipated. The company reported a fiscal first-quarter net loss of 409 million, or 1.20 a share, compared with a loss of 376.0 million, or 1.25 a share, in the year-prior quarter. 