In our 28-criterion evaluation of performance marketing agencies, we identified the 12 most significant ones — 360i, 3Q Digital, DAC Group, GroupM Performance, iCrossing, iProspect, Jellyfish, Merkle, Performics, Rise Interactive, Tinuiti, and Wpromote — and researched, analyzed, and scored them. This report shows how each provider measures up and helps B2C marketers select the right one for their needs.