You sold 24 shares to pay the tax on the 100 shares that vested. You need to report the sale of 24 shares. The correct cost basis is the value of the shares on the day they vested. Your employer should have added that value to your W-2, box 1 Wages. If they did include the value on you W-2, I suggest you report the sale of the 24 shares without indicating it was "Company Stock". Report you sale according to your 1099-B. If the broker reported the correct cost basis, you have nothing else to do. If, they did not report the cost basis or reported the wrong cost basis, they you will need to adjust the basis.
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