My advice: wait 1 month and then leave with 10%. As people mentioned, you don’t want to stay because the relationship is broken. It’s not worth your time. In

My advice: wait 1 month and then leave with 10%. As people mentioned, you don’t want to stay because the relationship is broken. It’s not worth your time. In terms of getting fired before 1 month is over, get an employment lawyer and talk this over with him. Most likely, you will have a case if they fire you just to save 7%. Get the lawyer first, before responding to your cofounder. If you think this business is going places, that will change my advice. In this case, get a lawyer and negotiate a higher % or assurance that you will stay at the company and continue to get vested. Maybe you will get more than 10%? Remember, investors/executive team will dilute you by issuing extra shares to the people who stay.