There are a few characteristics to look for in the best PPC firm. The best firms are good at math. They understand numerical trends, which can lead to more clicks on the site as the information is combined with what the viewer wants to see. 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.