JPMorgan has fired the starting gun on a fresh race for Jamie Dimon's successor as CEO with a leadership shake-up that saw some of its most senior bankers handed more responsibility.

With the elevation of Marianne Lake and Jenn Piepszak — both former chief financial officers — to co-heads consumer and community banking, JPMorgan has put two senior leaders in pole position to become the second female CEO of a major Wall Street bank after Jane Fraser won the top job at Citigroup last year.