Take a look at the CEOs who head up the biggest companies in the world and you’ll start to notice some startling similarities. Not in how they look, not in how old they are – but how they act. To be a CEO, you have to have a certain DNA. You have to be made up of certain attributes and in short, just not everyone has it in them. However, what exactly are these attributes? We’ve delved deep and scrutinized the most successful CEOs in the world and found that the following four characteristics are what separates them from the…