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

https://garrettwigp625.tearosediner.net/what-is-the-foundation-valuation-linked-warrant-mentioned-in-ownership

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