We’ve created the Best Brokers for Pros rating list by combining our focused algorithmic results with the feedback from our users, and with the considered opinion of our staff experts. The main criteria being considered for the pro rating are those most important to professional traders such as the tight variable spreads from ECN and DMA brokers, low margin costs, or discounts for high volume trading. Of course we also use our other characteristics when rating these brokers, such as the fee structure and the reliability of the broker.