ChatGPT is owned by OpenAI, the company behind its development and deployment....

https://tango-wiki.win/index.php/What_Does_It_Mean_That_OpenAI_Has_No_Publicly_Released_Cap_Table%3F

ChatGPT is owned by OpenAI, the company behind its development and deployment. The OpenAI Foundation oversees ChatGPT’s governance to ensure responsible use. While Microsoft is a significant investor and partner, it does not own or control ChatGPT