JPMorgan Chase promotes Doug Petno and Troy Rohrbaugh to copresidents, positioning them as potential successors to the bank's longtime CEO Jamie Dimon.

The moves would appear to make Doug Petno and Troy Rohrbaugh the most obvious possible successors to JPMorgan Chase CEO Jamie Dimon.

Dimon, who turned 70 in March, has been JPMorgan's boss for two decades, steering it through the financial crisis.