In 2022 you had a taxable event with the merger. You received cash and stock as payment for your equity. That was reportable and if you made any profit on your sale of the company that portion was taxable.
Assuming that that was reported then the stock that you received has a value at the time that you received it of 20% of your equity in the company. You don't need to report that stock at all (because it was part of the transaction that was reported in 2022) until you sell it.
When you do sell it you need to input the date of the sale and the amount that you were paid. You will also need to input the date you purchased it (which is the date of the merger) and the amount that you purchased it for (which is the value of the stock on the date that it was transferred to you).
@digian
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