See both answers above.  As a co-founder you need to protect yourself with specific rights within your founder’s documents. If you are a minority interest holder, this is even more important. Sometimes even majority owners do not have have a majority vote. In such cases, the risk of a squeeze out is very high.  Founders should also make sure that all managers and directors have fiduciary duties to the company and other owners, and if not, there should be a specific reason why.