Stephen Hemsley, the chairman of UnitedHealth Group, will reassume the position of CEO, succeeding Andrew Witty, who is stepping down due to "personal reasons," effective immediately. Hemsley previously served as CEO from 2006 to 2017. While the company did not provide specific details regarding Witty's departure, Hemsley acknowledged his leadership, particularly during challenging times.

This leadership change comes after a tumultuous period for UnitedHealth, including the death of Brian Thompson, the head of UnitedHealthcare, the company's insurance arm. Thompson was fatally shot in Manhattan in December. Luigi Mangione, accused of the crime, has pleaded not guilty, and the trial is expected to commence in 2026. Following Thompson's death, Tim Noel, previously CEO of UnitedHealth Group's Medicare and retirement business, took over the insurance unit.

Thompson's death sparked a national discourse on the U.S. healthcare system and public dissatisfaction with its current state. Hemsley stated the company has significant growth opportunities as it strives to improve healthcare and maximize its potential, aiming to return to its long-term growth target of 13% to 16%. The company has suspended its 2025 outlook due to increased care activity and expanded benefit offerings compared to the first quarter.

UnitedHealth also reported that medical costs for new Medicare Advantage beneficiaries were higher than anticipated. However, the company anticipates a return to growth in 2026. Hemsley will retain his position as chairman, and Witty will transition to a senior advisory role. Hemsley's history with UnitedHealth Group dates back to 1997, when he joined as chief operating officer, later becoming president in 1999 and board chair in 2017.