Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can a company control its stock through contracts with stockholders?
Your first scenario, involving shareholders in a private corp being limited by a contractual agreement, is common in practice. Frequent clauses include methods of valuing the shares if someone wants to sell, first right of refusal [you have to attempt to sell to the other shareholders, before you can sell to a 3rd party], and many others. These clauses are governed by contract law [ie: some clauses may be illegal in contract law, and therefore couldn't be applied here]. A Universal Shareholders' Agreement is just the same as the above, but applied to more people. You would never get an already public company to convert to a universal shareholders' agreement - because even 1 share voting 'no' would block it [due to corporate law limiting the power of a corporation from abusing minority shareholder value]. In practice, these agreements universally exist at the start of incorporation, or at least at the first moment shares become available. An example is the Canadian mega-construction company PCL*, which is employee-owned. When the original owner transferred the corporation to his employees, there was a USA in place which still today governs how the corporation operates.  In theory you could have a 'public company' where most shares are already owned by the founders, and 100% of remaining shares are owned by a specific group of individuals, in which case you may be able to get a USA signed. But it wouldn't really happen in practice.  *[Note that while PCL is broadly owned by a large group of employees, it is not a 'public company' because any random schmuck can't simply buy a share on the Toronto Stock Exchange. I assume most exchanges would prevent corporations from being listed if they had ownership restrictions like this].