Report the sale of the stock you received as an incentive in the section Income>>Investment Income>>Stocks, Bonds, Mutual Funds, Other.
Your cost basis for the shares you sold is the amount of income for which you were taxed (i.e., $25.5K) and the sales proceeds are the $21.1K you received.
Note that TurboTax has special "screens" for certain types of stock earned as employee compensation. So, review the categories under "Choose the type of investment you sold" and use the "Learn more" links to decide which category you should use. For example, the fact that you "took ownership" in 2018 but didn't get taxed on the shares until 2019 suggest that these shares may be some sort of "restricted stock" form of compensation.
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