 Shares of Big Lots Inc. BIG, 1.46 tumbled 14.1 in premarket trading Thursday, after the discount home essentials retailer reported a wider-than-expected fiscal third-quarter loss, disappointing sales and provided a downbeat outlook amid a challenging macroeconomic environment. Net losses for the quarter to Oct. 29 widened to 103.0 million, or 3.56 a share, from 4.3 million, or 14 cents a share, in the year-ago period. 