ROUND LOT

A group of 100 shares of a stock, or any group of shares that can be evenly divided by 100, such as 500, 2,600 or 14,300. A round lot has historically been the smallest order that can be placed through an exchange. However, "round-lot one" now allows for the execution of orders as small as one share on some exchanges. A round lot may also be referred to as a "normal trading unit".