Your IRS form 1099-B reports a sale of a stock. You inherited a portion of this stock portfolio and you purchased other portions of this stock portfolio.
The inherited portion of the stock portfolio will be considered long-term basis. The portion that you purchased may be long-term investments or short-term investments based upon the date of purchase and date of sale. Short-term investments are owned one year or less. Long-term investments are held more than one year.
You may need to contact your broker to discern the when you acquired the block of stock that was sold.
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