The premier artificial intelligence company isn't a public company at all, but rather private start-up OpenAI, the parent of ChatGPT. ChatGPT's debut exactly two years ago was an earth-shaking event, showing consumers and investors alike the astounding possibilities of generative AI. The only way to access OpenAI's growth today is through cloud giant Microsoft (MSFT -0.51%), which has invested almost $14 billion in the start-up. The catch was that until recently, OpenAI was a partially non-profit company, w ...