agree with intuit_noob. i do not see why any company would have an obligation to grant you unvested stock. usually this is $$ that will vest over time after you have done more work for the company. seeing that you are no longer part of the company, why would they gran this? the burden is on the the buying company. if they do not treat their employees properly, then they will leave the company and the buyer would be losing out on the recent purchase. take this up with endurance. leave the company if you are unsatisfied.