I need to know the leading worldwide "record labels" (hopefully ten or
more) who own classical music collections and have licensing rights in
the United States (whether the music was recorded in the United States
or elsewhere.)

I'm interested in a list, sorted by an estimate of how many individual
recordings they own, where they are located, and contact information
(of a licensing manager, if possible.) Corporate parentage (if
applicable) is also important (i.e. who owns the label?)