JPMorgan Chase

The largest U.S. bank's strong third quarter did not insulate its leaders from being pressed about the downside of pricey investments in technology, whether capital rules make commercial lending growth hard for big banks to achieve, and whether another economic downturn is edging closer.

The biggest U.S. bank leaned on old-fashioned lending in the third quarter to weather a slump in fixed-income trading.

The two megabanks face different problems, as Bank of America customers are frustrated over fees and customer service while Wells customers are alarmed about the bank's recent scandals.

JPMorgan Chase is eliminating 400 positions in its mortgage banking unit, the latest lender to trim staff as a result of lower-than-expected demand in 2018.

Glassbox, a digital customer management company based in London, allows banks like JPMorgan Chase and Bank of America to use data and analytics to study customers' behavior.