HIGHER: Twitter (TWTR), up 3% after BofA Merrill Lynch analyst Justin Post upgraded the stock two notches, to Buy from Underperform, after conducting a survey in early December of more than 1,000 U.S. consumers about social media use... Veritone (VERI), up 15% after raising its Q4 revenue outlook. UP AFTER EARNINGS: Bed Bath & Beyond (BBBY), up 8%. LOWER: Macys (M), down 18% after weak holiday sales and lowered FY18 guidance... Target (TGT), down 4% after backing FY18 guidance and announcing leadership team changes... Kohl's (KSS), down 9% after announcing November/December comparable sales and narrowing its FY18 EPS outlook... American Airlines (AAL), down 9% after cutting FY18 EPS view... Frontline (FRO), down 4% after Wells Fargo analyst Michael Webber downgraded the stock to Market Perform from Outperform and lowered his price target on the shares to $5.50 from $7... LB Brands (LB), down 8% after reporting flat December comparable sales... MongoDB (MDB), down 11% after Amazon's (AMZN) AWS launched DocumentDB... Yelp (YELP), down 6% after Morgan Stanley analyst Brian Nowak downgraded shares to Underweight from Equal Weight as he identified three building revenue headwinds that he believes will lead to negative revisions and underperformance of the stock.
