Founded in 1974, UnitedHealth Group is a leader in healthcare services in the United States. The company operates two businesses under one roof: UnitedHealthcare and Optum. UnitedHealthcare is the largest health insurer in the U.S., with a total of 53.0 million members as of March 31, 2025. Optum, on the other hand, provides the infrastructure, services, and expertise to improve healthcare in the United States.