In these sorts of companies the stock is privately held and therefore isn't listed or traded on any exchange. Think in terms of your local retail, construction and wholesale companies, including bars and restaurants, etc. These are in all likelihood set up where a number of family members have various percentages of the stock in that company. From time-to-time one family member will sell out his/her shares to another family member (or the remaining family members will buy the shares from the estate of a deceased member) or even a member of the public - if allowed by the articles of incorporation.