UnitedHealth Group Inc. is an American managed health care company based in Minnetonka, Minnesota. It is sixth in the United States on the Fortune 500. UnitedHealth Group offers products and services through two operating businesses, UnitedHealthcare and Optum, both subsidiaries of UnitedHealth Group. Optum is a healthcare service arm of UnitedHealth Group and the largest healthcare IT company in the world by revenue . Together, Optum and Unitedhealthcare serve approximately 115 million individuals in 2016. In 2016, the company reported an operating income of $13 billion.