Based on a February 13^th, 2013 Wall Street Journal Feature Article in which John Mattone was interviewed

First, the Facts………

• If you are a sr. executive in any global company—you have about a 25% chance you will be reporting to a new CEO this year.
• If you are a sr. exec in one of the global 2500 public companies, you have a 15% chance of reporting to a new CEO this year.
• Your new CEO likely arrived as part of a planned transition—either retirement or voluntary resignation (66%)