The ranking order for the Top 20 Executive Search Firms list is derived algorithmically based upon a proprietary weighting of several criteria. These include: annual revenue, number of placements, number of ancillary services or practice areas, level of searches handled by average salary, completion ratio, average time to complete, stick rate, client satisfaction (testimonials/votes), social media presence, and executive thought leadership. Our algorithm also negatively weights adverse circumstances (e.g. candidate exited based upon discovery which the search firm should have filtered, client litigation, poaching, etc.).