Let's assume a company, for example NASDAQ:YHOO, is listed on Google Finance with having issued 1.24B shares. Let's further assume I buy all of these stocks. (Let's assume all shareholders are willing to sell.) Where or how can I find out what portion of the total company these 1.24B shares represent?
I think I know that a company going public doesn't have to "sell" 100% of the company on the stock exchange – the company/owners can retain a certain amount. Where can I find out about these amounts? What's the keyword?