Assuming you didn't pay anything for the stock units, your cost basis in year of sale would be their fair market value when they were acquired times the number of units you sold in the current year. Income equal to the fair market value of the units is entered on your W-2 as compensation in the year they vest, so that would be your cost basis. Divide that by the number of shares vested and you have the cost basis of each share. Multiply that by the number of shares sold and you have your cost basis upon sale of the units.
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