Your cost basis for your RSU shares is the value on the date they were issued, which should have been added to your W-2 box 1 wages.
Your company should have provided you with the market price on the grant date. If not, you can use any one of a number of web sites to look up historical stock prices. The Market price on the grant could be necessary to calculate ordinary income, depending on when you sold your stock. Please refer to the following web page for information on the taxation and reporting of ESPP stock sales:
Employee Stock Purchase Plans
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