6. UnitedHealth Group
UnitedHealth Group is one of the best and most diversified health care businesses in the US. It has two business platforms, Optum for health services and UnitedHealthcare for health benefits.
Together they serve over 85 million people in all of US states and 125 countries. They use their vast knowledge and experience in clinical care and wish to improve the health care sector and its performance.
Just in 2013 they reported revenue of $122 billion, which is $12 billion more than the year before. Its headquarters are in Minnesota. In 2015, they reported $8.4 million of net income.