I would like to disagree a bit. Resolving disagreements between co-founders I tricky. I would request OP to assume good intent and ask the following question.

I would like to disagree a bit. Resolving disagreements between co-founders I tricky. I would request OP to assume good intent and ask the following question. > What are you giving me in return of my 40% of the stock ? Why is that a fair price ? I do not know, but it is perfectly possible that the other person might have a good answer. If you have already made up your plan you guys can agree on some kind of plan where you divest your stock over a period in one way to another. I have a suspicion that the other co-founder probably does not want OP around for whatever reason. But OP can help him by simply taking a break while keeping the stock.