Carvana fell again Friday a day after short-seller Hindenburg Research criticized the used-car retailer in an extensive report even as Wall Street rushed in to defend the company. Hindenburg said it took a short position in Carvana’s shares,

Short seller Hindenburg Research is betting against Carvana Co (NYSE:CVNA) with the stock up more than 300% over the past year. Despite the bearish report, shares are moving higher on Thursday. Here's a look at what you need to know.

Hindenburg Research on Thursday published the report, entitled “Carvana: A Father-Son Accounting Grift for the Ages,” which the investment research firm says it compiled from extensive research and 49 interviews with former Carvana employees,