Steve Eisman, a fund manager at Neuberger Berman, said Thursday at a conference he is betting Wells Fargo shares will go down, while Citigroup shares will rise. Wells Fargo shares have fallen far behind other financial stocks this year as the bank struggles to recover from a consumer sales scandal that broke last year. The stock has now fallen out of favor with a noted investor. "The cultural issues I think at Wells Fargo went very, very deep," Eisman told CNBC in a phone interview. "They have to unwind these cultural issues."