You have an AMT income adjustment for the difference between the regular tax basis and the AMT basis of the stock. This occurs because the AMT income recognized due to the exercise of the ISOs in the year of exercise is added to the stock's basis for AMT purposes, but not for regular tax purposes. If the price of the stock at the time you disposed of the stock is greater than or equal to the price of the stock at the time the ISOs were exercised, your adjustment will be a negative adjustment for the same amount as the original positive AMT ISO adjustment.
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