Who owns the most Ethereum nodes?

Could you please clarify who currently holds the most Ethereum nodes? Is it a single entity, a consortium of companies, or perhaps a decentralized network of individuals? I'm interested in understanding the distribution of ownership and how it may impact the overall security and decentralization of the Ethereum blockchain. Additionally, what are the implications for the future of Ethereum if the majority of nodes were to be controlled by a single entity or a small group of entities?