There are a number of reasons that a co-founder may want to part ways with another co-founder. Reasons for a co-founder's departureThere are a number of reasons that a co-founder may want to part ways with another co-founder. Make sure you are not giving an ousted co-founder leverage. It's critical to ensure that a co-founder has the legal right to terminate another co-founder. Forget to cut off access to systemsTo prevent an ousted co-founder from accessing company information post-termination, ensure that they can no longer access the company's systems.