No, nobody owns Cardano.
Once it has been set free, which it will be soon, its on its own. The voting system, will be to potentially contract people. That why Charles want it in before 2020, because thats what he has been “contracted” for - its in parenthesis because I dont think its even a real contract other than just his personal commitment, since Cardano is not a legal entity, and no one will be able to control it once it is set free.
At that time we can fire Charles if we want that, or vote someone else in to develop things we want, Charles might not even be up for choice.
Cardano Foundation would be, but again, since the network is decentralized, they are not the owner, no one is the owner, it has no owner. The closest you come to “owners” will be the ADA holders.