Go Through each one, they have different option %'s and with 2.0833% of the remaining options becoming exercisable each month for the following 48 months. (full vest 3/20/11) from the Granted Date 03-23-07 until fully invested by 03-20-11. some variations. I run models over the weekend, but we are happier then what could have been. Also look at their option price of 6.31.. .