If anyone cares. Marvel was bought by Disney. Before that Marvel sold the Spiderman movie rights to Sony, the X-Men and Fantastic Four Movie rights to Fox, and the Theme Park rights of many Marvel Characters to Universal.
Disney has now also purchased Fox. That means the MCU gets the movie rights back for X-Men and Fantastic Four. Personally, I just hope every movie doesn't turn into a Wolverine movie because that's what every Fox X-Men movie became.
Sony still has movie rights to Spiderman (which usually includes Spiderman villains). Disney does have merchandise control though.
Universal still has Marvel Theme Park rights east of the Mississippi, which is why, for example, the Hulk is a coaster in Universal and won't be in Disney World, but Disney World can use some Marvel Characters like the Guardians of the Galaxy.