As opposed to 20th Century Fox, Columbia Pictures, Warner Bros., Universal, and Paramount.

Because Disney bought Pixar in May 2006

Well, yeah. But they've been working with Disney way before 2006. Like when they did the first 2 "Toy Story" movies, as well as "A Bug's Life", "Monsters, Inc.", "Finding Nemo", and "The Incredibles".

What I was trying to say was they've always worked with Disney, they've planned to go to other movie studios, but they never came to fruition.