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I bought shares of a company several times. During this period the stock split a few times as well. I
sold some of the stock yesterday and now I don't know how to calculate the cost basis anymore. Please can anyone explain the method to do this?

This has been explained in the FAQ as well as in several previous posts which you could have searched for. You have to keep track of each purchase separately. You should know or be able to look up the splits either elsewhere in the Fool or at the company's investor relations web site. Multiply each purchase times the splits relative to that stock. The total number of shares in the first group of stocks you bought after calculating the splits is divided into the original purchase price to give you the per share price. You do this for each group so you won't have to do it later and your records are up to date. Multiply that times the number of shares you sold to get your cost basis on the stock you sold. The initially purchased group of stocks is the one you sold since you must use FIFO unless you used specific identification prior to selling the stock.
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