If this is a Qualifying Disposition- (Held at least two years from Grant and at least one year from exercise/purchase)
Since you don't have a 1099-B, there should be no need to adjust the basis. The basis for the sale will be the Strike Price you paid. The profit will be your Long-Term capital gain.
When you EXERCISED the option, you may have been subject to an AMT adjustment which would have been the amount of the discount.
Look at your Form 6251 for the tax year you exercised the option and Form 3921 from your employer to get this amount.
IF you are again subject to AMT the year you sell, you will adjust the gain on the stock reported on this year's 6251 by using a basis that includes the discount you claimed the year of exercise. So if the AMT adjustment was 2,000 when you exercised the option, the sale of stock reported for AMT will be 2,000 less than your capital gain.
Use this link for more information or if this was a disqualifying disposition
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