you need the donor's tax basis, the date the donor acquired it and also the fair market value on the date of gift.
you get the donor's holding period + any period you held the stock for determining the holding period.
if the FMV when gifted is greater than the tax basis you use the tax basis to determine gain/loss.
If the FMV when gifted was less than the original basis, and you later sold the stock for:
a) More than the original basis: use the original basis
b) More than the FMV at the time of the gift but less than the original basis: your selling price becomes the cost basis. You won't report a gain or loss in this situation
c) Less than the FMV at the time of the gift: use the FMV at the time of the gift
