I'm assuming you mean something like a corporate takeover of public company. If that's the case, no. Public companies are vulnerable to takeover because their ownership is public, traded on an exchange and their shares can be amassed by an individual or group.
The company itself is then governed by it's bylaws, which detail ownership rights - ie. how much stock do you need to own to have a majority voting interest, etc, etc...
Private companies work much the same way, however, if there is only one owner of the company, it cannot be taken over without that owner consenting (unless they've done something naughty and there is a court ordered mandate). If there are multiple owners than the individual owners must be individually contacted and their ownership interest purchased, although, again depending upon corporate bylaws this may or may not give you any control over the corporate operations.
Corporate law is very complex, but pretty basic to understand once you have the concepts down.