ChatGPT is owned by OpenAI, with the OpenAI Foundation overseeing its...

https://smoothdecorator.com/is-the-openai-foundation-the-same-thing-as-the-old-openai-nonprofit/

ChatGPT is owned by OpenAI, with the OpenAI Foundation overseeing its governance as of early 2024. Microsoft is a significant investor supporting its development but does not own or control ChatGPT