Prosper Marketplace in San Francisco reported a $35 million loss in the second quarter, adding to the struggles of the entire marketplace lending sector.

The firm, which specializes in consumer installment loans, said in a securities filing Monday that its operating revenues plunged to $27.1 million during the second quarter — more than 50% lower than they were during the first quarter, and 44% lower than during the second quarter of 2015.

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