Netflix shares tumble after the video streamer issues soft margin guidance, overshadowing a fourth-quarter earnings beat.

U.S. stock futures up, focus on JNJ earnings, GameStop CEO's stock purchase, Halliburton earnings, Netflix results.

GameStop (GME) reported net income of $77.1M but revenue fell 4.6% as software sales dropped 27%. Collectibles now account for 31% of GameStop revenue and represent the only growing segment. GameStop ...