Only six corporations own all mainstream media in the United States

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The “Big Six”[edit]

The Big Six[1] Media Outlets Revenues (2009)
Comcast NBCUniversal (a joint venture with General Electric from 2011 to 2013), NBC and Telemundo, Universal Pictures, Focus Features, 26 television stations in the United States and cable networks USA Network, Bravo, CNBC, The Weather Channel, MSNBC, Syfy, NBCSN, Golf Channel, Esquire Network, E!, Cloo, Chiller, Universal HD and the Comcast SportsNet regional system. Comcast also owns the Philadelphia Flyers through a separate subsidiary. $157 billion
The Walt Disney Company Holdings include: ABC Television Network, cable networks ESPN, the Disney Channel, A&E and Lifetime, approximately 30 radio stations, music and book publishing companies, production companies Touchstone, Marvel Entertainment, Lucasfilm, Walt Disney Pictures, Pixar Animation Studios, the cellular service Disney Mobile, and theme parks in several countries. Also has a longstanding partnership with Hearst Corporation, which owns additional TV stations, newspapers, magazines, and stakes in several Disney television ventures. $36.1 billion
21st Century Fox/News Corporation Holdings include: the Fox Broadcasting Company; cable networks Fox News Channel, Fox Business Network, Fox Sports 1, Fox Sports 2, National Geographic, Nat Geo Wild, FX,FXX, FX Movie Channel, and the regional Fox Sports Networks; print publications including the Wall Street Journal and the New York Post; the magazines Barron’s andSmartMoney; book publisher HarperCollins; film production companies 20th Century Fox, Fox Searchlight Pictures and Blue Sky Studios. $30.4 billion
Time Warner Largest media conglomerate in the world, with holdings including: CNN, the CW (a joint venture with CBS), HBO, Cinemax, Cartoon Network/Adult Swim, HLN, NBA TV, TBS, TNT,truTV, Turner Classic Movies, Warner Bros. Pictures, Castle Rock, DC Comics,and New Line Cinema. $25.8 billion
Viacom Holdings include: MTV, Nickelodeon/Nick at Nite, VH1, BET, Comedy Central, Paramount Pictures, Paramount Home Entertainment and Atom Entertainment. Viacom 18 is a joint venture with the Indian media company Global Broadcast News. $13.6 billion
CBS Corporation Holdings include: CBS Television Network and the CW (a joint venture with Time Warner), cable networks CBS Sports Network, Showtime, TVGN; 30 television stations; CBS Radio, Inc., which has 130 stations; CBS Television Studios; book publisher Simon & Schuster. $13.0 billion

http://en.wikipedia.org/wiki/Media_cross-ownership_in_the_United_States
 
These 6 Corporations Control 90% Of The Media In America
http://www.businessinsider.com/these-6-corporations-control-90-of-the-media-in-america-2012-6