Ownership
There are many different media conglomerates around the world and they own many smaller companies or corporations called subsidiaries. Conglomerates are large corporations with multiple media interests. They merge with other companies to form some kind of synergy between them. For example, Disney owns ESPN and ABC; they are not just interested in one aspect of TV and Film. There are also other conglomerates like Sony, Universal, Viacom Universal, and the ITV.
Media Subsidiaries are companies that are completely or “partly owned and partly or controlled by another company that owns more than half of the subsidiary's stock. The subsidiary can be a company, corporation, or limited liability company. An example of this is Sky TV which is owned by NewsCorp a conglomerate which has many other subsidiaries like 20th Century Fox and also ITV owns both channel 4 and 5.
Private Companies are companies that are either owned by non-governmental organizations or by a relatively small number of shareholders or company members which does not offer or trade its company stock (shares) to the general public on the stock market exchanges, but rather the company's stock is offered, owned and traded or exchanged privately
Private companies are very similar to independent companies; the only real difference is that private companies can choose their shareholders. Private companies don’t need to meet the strict exchange commission requirements that public