Fortune 100 is an annual list of companies that are privately held in the United States or whose ownership is within US. The ranking of the companies coming under fortune 100 is compiled annually through calculating each company's gross revenue. The list is then officially published by the Fortune magazine. Unlike Fortune 500 and 1000, Fortune 100 is a US-only list and is exclusive to companies within the United States. A company that makes the Fortune 100 list is called as a Fortune 100 Company. United States based companies that run international operations also fall under the category of Fortune 100.