can't tell you without knowing the company. every merger is different and even the tax consequences can be different. some mergers are completely taxable others are not taxable at all except for any fractional shares sold. if you want to keep it simple; the broker has not allocated any cost to the frac shares on the 1099B; and not many $$$'s are involved you may want to keep it simple but reporting no cost basis and a holding period going back to the original company.
