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

https://www.foxtrot-bookmarks.win/openai-owns-chatgpt-the-ai-chatbot-that-s-reshaped-how-people-interact-with

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