Let's start simple: All the RSU vested at once. This means they will all be together in the W2 box 1 the year they vested for the main basis. Your W2 issuer will have the breakdown of the information. Verify when they vested and the amount.
Next, you may possibly have received some dividends before vesting that were in your W2 box 1. This is not as common
Next, you will want to add any cost of purchase and sale to the basis.
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