bitcoin.org is owned by bitcoin developers.
bitcoin.com is owned by person/people who provide bitcoin services.
But who owns the "Bitcoin" brand?
A currency is not a society that can be considered a brand. A currency is a currency. It is not even known for sure who invented it. It is believed to be a certain Satoshi Nakamoto.
Bitcoin is a "brand", if you will, owned by us investors. No one has mastered it so far, so it is ours, everyone's and it is the main reason why we love cryptocurrency.