ChatGPT is owned by OpenAI, the company that developed and maintains the AI....

https://landensbrilliantperspectives.capitaljays.com/posts/who-actually-controls-openai-if-investors-own-shares

ChatGPT is owned by OpenAI, the company that developed and maintains the AI. The OpenAI Foundation oversees the governance to ensure responsible use. While Microsoft is a significant investor and partner, it does not own ChatGPT or control OpenAI