We continually hear complaints of fake news and biased reporting. We see the faces on TV spouting their lines, most often created by their producers and not them. And nobody really knows who those producers or directors are – the real people behind the news. At least there are some of those faces who makes no pretense as to who they are and what their agendas are.
So, back to the question. According to Wiki:
Globally, large media conglomerates include Bertelsmann, National Amusements (Viacom Inc. and CBS Corporation), Sony Corporation, News Corp, Comcast, The Walt Disney Company, AT&T Inc., Fox Corporation, Hearst Communications, MGM Holdings Inc., Grupo Globo (South America) and Lagardère Group.[4][5][6]
As of 2018, the largest media conglomerates in terms of revenue rank Comcast, The Walt Disney Company, AT&T, CBS Corporation and Viacom per Forbes.
At least we know who owns them.
My rambling comes from this article @ Follow the money: Rick Sanchez, John Huddy & Chris Hedges explain media decay