Stocks are traded in quantities of 100 shares, called round lots. Any quantity of stock under 100 shares will be considered an odd lot.

It is fairly easy to invest in foreign corporations, because these corporations need to register these securities with the SEC. These companies are subjected to the same rules as U.S. companies.

Most stocks are common stocks. However, there is another type (known as preferred) which gives certain advantages regarding dividends. Generally, preferred stock holders do not have the same voting rights that the holders of common shares do. Common stocks are based on company performance, while preferred stocks will usually have a stated dividend.