ChatGPT is owned by OpenAI, the organization that developed the AI platform....

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 organization that developed the AI platform. The OpenAI Foundation oversees governance to guide its mission and ensure responsible use. Microsoft is a significant investor and partner but does not own or control ChatGPT