IANAL and I don't know all the details but... If your dismissal is "obvious" (in the sense that it is done with a view towards denying your share) i.e., your

IANAL and I don't know all the details but... If your dismissal is "obvious" (in the sense that it is done with a view towards denying your share) i.e., your performance to date has been good and you get the boot, as you say, "right before" a scheduled vesting date, then you probably have a case. Enough to make an inquiry with an attorney, at least.