Wall Street banks are scaling back their role in supporting debt sales that have helped online lending companies double their originations every year since 2010.

Investment banks earn fat fees by helping lenders pool and store their loans until enough are aggregated for sale to investors. But Goldman Sachs Group Inc., Credit Suisse Group AG and JPMorgan Chase & Co. are among the Wall Street firms considering limits to their financing for companies that lend to certain higher-risk borrowers, people with knowledge of the policies said.

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