It depends. For a mutual fund you are allowed to average the cost basis. For other stocks it is first in-first out and if your investments have been in the hands of your financial agent or more than one agent, they may not have tracked the cost. Reinvested dividends will also play a part, as well as stock splits if applicable.
Use the method you believe will provide the best cost basis for the shares you sold. Keep track of your analysis with your tax records.
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