If you have no w2, then you must have acquired the ESPP before 2021, when you did work for the company. The basis of your ESPP is the amount you paid (previously included in your income, on your w2) plus the amount of the discount you received. The sale is entered in stock sales using your 1099-B.
I want to urge you to create a financial notebook that is kept separate from your tax return. Keep it safe and each year, add your year-end statements from all your financial accounts plus a copy of your W2’s, 5498, and any 8606 forms.
This will protect you down the road as proof of your basis in your various investments. As you go through life, rollovers, ESPP sales, and more will be captured for you. When you do sell, your notebook will be invaluable with knowing what was first, the order, the basis, and the lot size for stocks.
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