The heat remains on Jamie Dimon to split his role as chairman and as chief executive officer of J.P. Morgan Chase & Co. (NYSE: JPM). Investors might want to tread carefully here. Jamie Dimon has hinted that he may leave his post if the role of chairman and chief executive officer are divided on him. If a research report is accurate, this corporate governance move could cost J.P. Morgan shareholders a large amount of money.

Brokerage firm CLSA has a report out from Mike Mayo after it surveyed shareholders of J.P. Morgan Chase showing that large holders would likely sell their shares of the largest bank by assets. It was put as high as a 10% price drop, valued at some $20 billion, if Dimon leaves and those shareholders hit the ejection button.

Mayo talked about a leadership vacuum at Chase and no clear successor. What is interesting is that Mike Mayo has had public anti-Dimon posturing for some time and the firm has an Underperform rating on shares of J.P. Morgan Chase. We would note that men such as Ken Langone and Warren Buffett have been vocal supporters of Jamie Dimon.

Dimon’s controversy has been in the aftermath of the London Whale losses and this is the key reason we have Wells Fargo & Com. (NYSE: WFC) ahead of J.P. Morgan on America’s 7 Safest Large Banks. That being said, 24/7 Wall St. thinks that investors would flock heavily into the next bank stock that Jamie Dimon went to if he left.

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