Competition is heating up on Wall Street. Here are 4 things to watch as they report earnings.

As Wall Street's biggest banks prepare to report fourth-quarter earnings next week, competition is intensifying across nearly every part of the business — from dealmaking and talent to technology. JPMorgan Chase kicks things off Tuesday, followed by Bank of America and Citi reporting on Wednesday, and Goldman Sachs and Morgan Stanley on Thursday. That competitive pressure is shaping how investors, analysts, and executives are thinking about the coming year. In an interview, Mike Mayo, a longtime Wells Farg ...