Public Markets

How each stock market works is dependent on its internal organization and government regulation. The NYSE (New York Stock Exchange) is a non-profit corporation, while the NASDAQ (National Association of Securities Dealers Automated Quotation) and the TSE (Toronto Stock Exchange) are for-profit businesses, earning money by providing trading services.
Most companies that go public have been around for at least a little while. Going public gives the company an opportunity for a potentially huge capital infusion, since millions of investors can now easily purchase shares. It also exposes the corporation to stricter regulatory control by government regulators.
When a corporation decides to go public, after filing the necessary paperwork with the government and with the exchange it has chosen, it makes an initial public offering (IPO). The company will decide how many shares to issue on the public market and the price it wants to sell them for. When all the shares in the IPO are sold, the company can use the proceeds to invest in the business.