GroupM is the world’s leading media investment company responsible for more than $50B in annual media investment through agen ... cies Mindshare, MediaCom, Wavemaker, Essence and m/SIX, as well as the outcomes-driven programmatic audience company, Xaxis. GroupM’s portfolio includes Data & Technology, Investment and Services, all united in vision to shape the next era of media where advertising works better for people. By leveraging all the benefits of scale, the company innovates, differentiates and generates sustained value for our clients wherever they do business. read more