It seems challenging at times to know which entertainment companies own which properties. That was why I wanted to thank the Geek Twins for creating a "Visual Guide to Marvel Character Movie Rights." It is a great way of providing an easy to understand and very compelling graph.
It’s an old version, refer to the newest one : http://2.bp.blogspot.com/-fm9HZGZ455w/U9-w6Z-1_zI/AAAAAAAAtN4/G4w5Bw76Dhc/s1600/marvel-rights-2-1200×960-300dpi.png