Concentration of media ownership (also known as media consolidation or media convergence) is a process whereby progressively fewer individuals or organizations control increasing shares of the mass media. Contemporary research demonstrates increasing levels of consolidation, with many media industries already highly concentrated and dominated by a very small number of firms. As of 2020, the largest media conglomerates in terms of revenue are Comcast, The Walt Disney Company, AT&T, and ViacomCBS, per Forbes.