automated forex trading, time to buy and sell stock http://insiders-guide-to-forex-trading.blogspot... As the value of your securities increases, so does your net worth. When the price of the stock in your possession reaches a high point, it is time to sell, making a profit on your original investment. Ideally, you will always sell your holdings for a reasonably higher price than the purchase amount and should never sell when the current value of the stock is below your initial purchase price.