UnitedHealth Group began as Charter Med, founded by Richard Burke in Minnesota in 1974. In 1977 he formed United HealthCare Corporation to manage HMOs created after the federal HMO Act of 1973. The company went public in 1984 and, under CEO William McGuire in the 1990s and 2000s, grew through acquisitions such as Oxford Health Plans (2004) and PacifiCare (2005).
Optum and vertical integration
In 2011, under CEO Stephen Hemsley, UnitedHealth grouped its pharmacy, care delivery and technology businesses under Optum. Optum Rx grew with the $12.8 billion Catamaran deal in 2015, Optum Health added physician groups and home health providers such as LHC Group, and Optum Insight added Change Healthcare in 2022. By 2025 Optum generated $270.6 billion in revenue before eliminations, while UnitedHealthcare generated $344.9 billion.
The 2024-2025 shocks
A February 2024 ransomware attack on Change Healthcare disrupted U.S. claims processing for weeks. In December 2024 UnitedHealthcare CEO Brian Thompson was killed in New York. In 2025 medical costs surged, CEO Andrew Witty stepped down in May, Hemsley returned, and earnings from operations fell to $19.0 billion on $447.6 billion in revenue. The company also confirmed DOJ criminal and civil inquiries into its Medicare business.
The 2026 reset
For 2026 UnitedHealth guided to more than $439 billion in revenue, trading some membership for margin. It sold Optum UK and a stake in Florida WellMed clinics to TPG. After Q2 2026 revenue of $112.0 billion and a 4.9% net margin, it raised adjusted EPS guidance to $19.50-$20.00.