Who owns the film industry?

When researching the different film companies and who owns them, one i immediately recognised was 'The Walt Disney Company' who own Buena Vista and Walt Disney Studios.  They are well known for producing films such as 'Cinderella' and 'Lilo and Stitch' and the companies become such a large corporation that it has a 'DisneyWorld' and many 'Disney' stores.  The 8 corporations, that are called the 'Big Eight', own whats called the 'Big Ten' which are the ten big hollywood studios.  Aswell as Walt Disney company this consists of 'News Corporation' who owns the well known '20th Century Fox' well known for making the famous series 'The Simpsons'. And,

• Viacomn who own paramount picture and produce films classics such as Mission impossible and Indiana jones
• Sony who own Sony Pictures and is known for Smurf and Superman
• Time Warner who owns Warner Bros. and New Line Cinema and makes films like Harry potter and Dark knight rises
• NBc Universal who own Universal Studios known for jaws and jurassic park
• MGM(metro-goldwyn mayer) known for making the Hobbit and Skyfall