Netflix Inc. shares NFLX, -35.12% slid another 4% premarket Thursday, continuing the rout that was sparked by its weaker-than-expected first-quarter earnings that showed it losing subscribers for the first time since its infancy and a forecast for a loss of 2 million in the current quarter. The stock slid 35.1% Wednesday to mark its steepest single-day percentage decline since it fell a record 40.9% on Oct. 15, 2004.