Everyone knows that marketplace lending is growing by leaps and bounds. But now there is data to quantify the industry's rapid emergence.

Thirteen of the online lending sector's largest firms made $15.91 billion in U.S. loans in 2014, up 700% from 2010, according to a report published Friday by the California Office of Business Oversight. In the first six months of last year, the same firms extended $12.47 billion in credit nationwide, the report found.

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