A leading PPC firm will examine the market to determine what type of link as well as words and phrases need to be placed on the website to deliver results. The firm will often think of new ways to reach customers that will set the client apart from the competition. The companies below have been reviewed based on a wide range of qualitative and quantitative statistics. In some cases, variable listing fees effect position on this list; however only highly-regarded firms are accepted through our review analysis. Learn more about our ranking process here.