1099b shows date of sale of stocks and proceeds. but does not show date acquired and cost basis. Also, box 5 states non-covered and X (unknown holding period). Problem is I bought company A years ago and 3 years(2019) ago they were acquired by another company. This company gave me x amount of stock in the new company. Last year(2022) I sold stocks of the new company three different times. Question is what date to use for when the stock was acquired and the cost of the stock.
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If I understand this correctly.
To calculate cost basis.
The sale of shares of Company B will have the per share value calculated above compared to the proceeds on your 1099-B.
The date acquired will be the purchase date of Company A
In the Sales Section of the entry screen select Unknown term basis not reported to the IRS

Leave the cost basis blank, but select. The cost basis is incorrect or missing on the 1099-B.

Then enter your new cost basis.
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