BalletTalk recently hosted a heated discussion over the current state of 'ownership' over Balanchine's ballets. I decided to look up a few of the sources to pull together a base report. My impression is that most of the ballets are now concentrated in the Balanchine Trust, though it's not clear which ones are currently not.
I suggest reading the thread in its entirety. For ease of navigation, direct links to my report are posted below.
Part I: The Legacy
Part II: Ballets Named in the Will
Part III: Financial Assessments of the Legacy