Here are the biggest risks Uber's facing, according to Wall Street analysts

Uber's stock price fell more than 6% in trading Friday as investors digested a less-than-stellar second-quarter earnings report.

The company lost $5.2 billion in the three-month period.

Things could get worse, too, Wall Street analysts warn. Here's what they're worried about.

Uber just reported yet another quarter of growth.

Despite some massive, one-time charges related to its IPO, Uber continued to grow its “gross bookings” segment, a closely watched measure that accounts for receipts from taxi rides and Uber Eats orders.

Wall Street remains bullish on the company, with an average price target of about $51 — about 27% higher than Friday's close — but there's plenty to worry about, too.

Here are the biggest concerns on analysts' minds following the company's less-than-stellar second-quarter earnings report: