ChatGPT is owned by OpenAI, the company that developed and maintains the AI....

https://penelopessmartdigests.talesignal.com/posts/is-openai-controlled-by-one-investor-after-the-852-billion-valuation-round

ChatGPT is owned by OpenAI, the company that developed and maintains the AI. The OpenAI Foundation oversees the governance to ensure responsible use. While Microsoft is a significant investor and partner, it does not own ChatGPT or control OpenAI