Everything is owned
I'm not one to raise red flags about the growth of the large media conglomerates, and I'm not going to start now. There will always be room for the person who has something to say and the wit to say it clearly and cleverly. That's one of the ways you get to be a Big Boy. After all, Rush Limbaugh used to be a disk jockey, and Mike Wallace used to host a game show.
That said, you might find this chart instructive. From The Nation, it lists their Big Ten corporate behemoths and a fairly comprehensive list of their holdings. At least for now. As the accompanying article explains, these things aren't etched in stone.