Perhaps. If the stock basis on the 1099-B does not seem correct (quite likely) then you need to calculate the basis. The following information may be helpful for you. For RSUs this is how the basis is determined.
It appears that you've been awarded some amount of your employer's stock and the "fair market value" of the award, (or, if you paid something for the stock, the "spread" between the amount you paid and the "fair market value" of the award), has been reported as compensation on your W-2.
The income that was included in the W2 is part of (possibly totally) the cost basis of the stock. Review the documents to see what the fair market value )FMV) was on the date of exercise or vested (and amount actually paid on that date if applicable) along with the difference of FMV. OR the vested amount included in the W2, box 12. Divide this by the number of shares you received then multiply this by the shares sold to arrive at your cost basis.
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