Humana Inc. is a Louisville, Kentucky-based for-profit American managed health care company that markets and administers health insurance in the United States. Humana has over 13 million customers in the U.S., reported a 2013 revenue of US$41.3 billion, and has over 52,000 employees. In 2013 the company ranked 73 on the Fortune 500, which makes it the highest ranked (by revenues) company based in Kentucky. It is also the third largest health insurance provider in the nation. Humana was investigated by U.S. Dept. of Health and Human Services for sending flyers to MediCare recipients that were characterized by the AARP as being deceptive. The company’s managed care model has also been criticized for ethical lapses and limitations.