Traditional brokerage firms require you to buy one full share of a company or more. While this is in line with regulatory requirements, it limits your trading opportunities. For example, you can buy one Zoom share at a price of $266 but you cannot buy fractional shares. However, if you decide to buy shares via CFDs, you can trade fractional shares of Zoom and more importantly, you can use a leverage ratio. This means that you can buy one share of Zoom with the amount of just $50.