JPMorgan Chase has appointed Doug Petno and Troy Rohrbaugh as co-presidents, signaling a significant step in succession planning for CEO Jamie Dimon. Rohrbaugh will now lead consumer and community banking, while Petno takes the helm of the commercial and investment bank. These moves potentially refine the pool of candidates for the top leadership position at the financial giant, a transition keenly watched across Wall Street.

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.