Contextual ad network launched by Google on June 18, 2003. Historically it focused on contextually relevant ads, but over time more ads have been driven by ad retargeting.
Cross-platform & cross-channel marketing company formed in 2008 by Neil Capel and Ian White to help increase publisher yields by automating content recommendations.
Real time bot detection platform founded in 2012 by Tamer Hassan, Dan Kaminsky, Ash Kalb and Michael Tiffany. They help advertisers spend money more efficiently by detecting and neutralizing ad fraud.