Carvana, the online used-car retailer that last week was the target of a short-selling research report, got its first broker upgrade since then which says the controversy has sparked a buying opportunity.

The report centers on Carvana's practice of loan sales as well as the business relationship between CEO Ernie Garcia III and his father, Ernest Garcia II.

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,

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ET with statement from Carvana company spokesperson. Shares of Carvana (NYSE:CVNA) were under brief selling pressure early on Thursday after Hindenburg Research published an unfavorable report. Hindenburg confirmed it has taken a short position in Carvana (NYSE:CVNA) based on its findings.