How do you intend on doing that?
Lets consider this, the vast majority of the super rich are super rich in one of two ways, either they inherited a base or built up land (such as the duke of Westminster) or they set up a small company which subsequently went huge (Gates, Zuccenburg -or however you spell it...). Both those mean the vast majority of their wealth isn't really removeable by them or the government.
Should Microsoft really only be allowed to make a 10m profit? How on earth would you realistically be able to do that without opening them up to bancrupcy due to the margins? How about allowing companies to make a small percentage profit, such as 2%? In which case that covers the majority of profits from the biggest companies (or very close to). If you're selling and spending billions 2% is a very big number.
Is bill gates greedy because he wantsto keep a share of a company he set up? Should he have to relinquish those shares and glhand the money over the governments because some people don't think it's "fair" that he set up a successful company?