What is Best Execution Policy? Up to now Investment Services Firms were obliged to deliver the best possible result for the client when executing client orders, mainly in terms of pricing. The MiFID broadens this obligation. To determine the best possible result, other factors should be also taken into account, such as the speed and probability of the order execution, transaction costs, etc. Find out more about how Piraeus Group ensures best execution of its client orders in the Order Execution Policy.