I wonder if there is case for a lawsuit here especially if there is no across the board performance issue with all of these employees who are being asked to sur

I wonder if there is case for a lawsuit here especially if there is no across the board performance issue with all of these employees who are being asked to surrender stock. I would argue that they were promised something that the company is failing to deliver and it is thus engaging in fraud, but I am not a lawyer thus I am unsure how to make this into an effective legal argument.