Shares of Carvana Co. rallied more than 10% late Wednesday after the company, which operates a platform for buying used cars online, reported a slightly wider-than-expected net loss for the first quarter but sales were above Wall Street expectations. Carvana said it lost $7 million, or 53 cents a share, in the quarter, compared with a loss of $38 million, or 28 cents a share, in the year-ago period. Adjusted for one-time items, Carvana lost 40 cents a share. Sales rose to $360.4 million, compared with $159.1 million a year ago. Analysts polled by FactSet had expected an adjusted loss of 39 cents a share on sales of $354 million for the quarter. Carvana shares ended the regular trading day down 0.8%.