How do you calculate the cost basis for Exxon Mobile?

To calculate the cost basis for Exxon Mobil, you need to know the purchase price per share and any associated transaction fees or commissions. Multiply the number of shares purchased by the purchase price and add any fees to obtain the total cost basis. If you have reinvested dividends or made additional purchases, those should also be factored in to get the adjusted cost basis. Keep detailed records for accurate reporting, especially for tax purposes.