We just got a better idea about who might succeed Jamie Dimon as JPMorgan CEO

• JPMorgan gave its biggest clue yet as to who might succeed longtime CEO Jamie Dimon.
• Investment bank co-CEOs Doug Petno and Troy Rohrbaugh will become the firm's new co-presidents.
• Dimon, who turned 70 in March, has been JPMorgan's boss for two decades.

JPMorgan has named two new co-presidents in its biggest hint yet as to who might replace longtime CEO Jamie Dimon.

On Thursday, the finance giant said Doug Petno and Troy Rohrbaugh, who are currently the co-heads of JPMorgan's investment bank, would become co-presidents effective immediately.

Alongside becoming co-presidents, Petno will become the sole CEO of JPMorgan's investment banking arm, while Rohrbaugh will become CEO of its commercial and community banking division.

JPMorgan directly tied the moves to succession planning, saying they were part of a "process to ensure continued exceptional leadership at the highest levels of the company."

"The changes announced today mark an important step in our Board's thoughtful process around succession planning and development of our top leaders," Dimon said in a press release, praising their "extraordinary leadership capabilities."

Dimon, who turned 70 earlier this year, has been JPMorgan's CEO since 2006 and steered the bank through the 2008 financial crisis. He has presided over its reign as the biggest bank in the US, with over $4.4 trillion of total assets.

This is a developing story.