I think you are misunderstanding the way corporations are organized. All corporations must have a board of directors, and the board of directors is the ultimate top level decision making entity within the corporation. The board is always in control. Shareholders have the ability to periodically vote on directors, but that is basically the extent of their power. Shareholders have no right to influence day to day operations of the corporation. So, if you are a founder and want to assure control of the board, you must maintain a majority of voting class shares, otherwise large investors could vote in their own directors who can do whatever they want (like replacing the founder as the CEO).