What is the bid-ask spread? the difference between the lowest price being quoted to sell a stock and the highest price being quoted to buy that stock all of the costs and fees that a stock exchange charges in order to process a transaction the rise or fall in the value of a stock between the time it is acquired by an investor and sold by that investor the difference in the selling price of a stock between different exchanges the change in the price of a stock from the market's open to the market's close