Overview:Xaxis is the world's largest audience buying company. Through its proprietary platform, Xaxis offers advertisers a single, comprehensive resource from which to reach and engage with global audiences across the universe of digital media. Xaxis does this for its GroupM agency partners, Maxus, MEC, MediaCom, and Mindshare. Xaxis has a presence in 12 countries across North America, Europe, and Australia. Xaxis is a part of WPP.