Roku's stock falls 23% — and one bear now sees challenges brewing ‘on all flanks'

Roku Inc. shares are on track to shed almost a quarter of their value Friday, and one analyst sees the media-streaming company ”at the precipice of being squeezed by the emergence of challengers on all flanks.”MoffettNathanson analyst Michael Nathanson has been worried that Roku’s ROKU, -23.89% “first-mover advantage in streaming connectivity” could dwindle as bigger players encroach on its turf, and he now wonders if a tipping point is on the horizon. “On the device side, as the market has shifted from sma ...