 Burlington Stores Inc. shares BURL, 3.10 slid 9.6 in premarket trading Thursday, after the discount retailer missed second-quarter sales estimates amid a challenging macro background and offered guidance that was below consensus. The company posted net income of 12 million, or 18 cents a share, for the quarter, down from 103 million, or 1.50 a share, in the year-earlier period. 