< PrevNext > 45. UnitedHealth Group Minnetonka, Minn. Share 2019 U.S.-Booked Air Volume: $92 million BTN estimates UnitedHealth Group had a U.S.-booked air spend of $92 million in 2019, down $7 million from 2018. The health care company generated total revenue of $242 billion, up 7 percent year over year. The number of employees at the company was 325,000, up from 300,000 from 2018. UnitedHealth Group is in the process of acquiring specialty pharmacy and infusion services provider Diplomat for roughly $300 million.