Is OpenAI a USA company?

Could you please clarify for me if OpenAI is indeed a company that is based in the United States of America? I'm interested in understanding the geographical location of this organization, as it may have implications on its operations, regulations it adheres to, and the overall impact it has on the global AI landscape. Additionally, I'm curious to know if there are any notable partnerships or collaborations OpenAI has with other companies or institutions within the USA, and how these relationships contribute to its success and growth.