It sounds like you sold stock you received from a Restricted Stock Unit (RSU) award. If that is the case, then you have to adjust your cost basis to account for the fact that the value of your RSUs was included in your taxable income. You also could have acquired the stock from Non-Qualified Stock Options (NQSO). You need to determine exactly what kind of company stock award you got the stock from to determine how to report the 1099-B.
See the following TurboTax article: What are restricted stock units (RSUs) and how do I report them?
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