Limit Order A limit order is the most basic type of order, where a user places a buy or sell instruction at a specified price.A buy limit order requires purchasing the asset at a price no higher than the set level.A sell limit order requires selling the asset at a price no lower than the set level. The main purpose is to give traders precise control over the execution price. However, such orders are not executed immediately—they will only be filled once the market price reaches the specified ...