Where can I buy OpenAI?

Excuse me, I've been hearing a lot about OpenAI lately and its advancements in artificial intelligence. I'm particularly interested in the potential of its technologies for financial applications. Could you possibly clarify something for me? Is OpenAI actually available for purchase, as an asset or company? I've been trying to find information on how to acquire a stake in it, but I'm not sure if I'm looking in the right places. Could you possibly guide me in the right direction? Perhaps there's a specific exchange or platform where I can buy shares in OpenAI? Any information you could provide would be greatly appreciated.