Humana Inc. is an American managed health care company that markets and administers health insurance. With over 11.1 million customers in the United States, the company is the largest (by revenues) Fortune 100 company headquartered in the Commonwealth of Kentucky, and has a market cap of over US $13 billion, $36.5 billion in revenue, and over 40,000 employees worldwide. Humana markets its health insurance services in all 50 U.S. states, D.C.