In our 21-criteria evaluation of B2B marketing data providers, we identified the 12 most significant ones — Bombora, DataFox, DiscoverOrg, Dun & Bradstreet, Infogroup, InsideView, Leadspace, Orb Intelligence, Radius, ReachForce, TechTarget, and ZoomInfo — and researched, analyzed, and scored them. This report shows how each provider measures up and helps B2B marketing professionals make the right choice. This is an update of a previously published report; Forrester reviews and revises it periodically for continued relevance and accuracy.