stock options stock options are granted at 100% ( 100 % ) of fair market value on the date of grant and have 10-year terms . stock options granted vest one year after the date of grant with respect to 25% ( 25 % ) of the shares granted , an additional 25% ( 25 % ) after two years , an additional 25% ( 25 % ) after three years , and the remaining 25% ( 25 % ) after four years . the plans provide for accelerated vesting under certain conditions