UnitedHealth Group announced on Tuesday that Stephen Hemsley will reassume the role of chairman and CEO, taking over from Andrew Witty, who has stepped down for “personal reasons” effective immediately.
Witty’s abrupt exit leaves many questions unanswered. Hemsley, who previously led the company from 2006 until 2017, acknowledged Witty’s contributions, highlighting his leadership during challenging periods for the organization.
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The announcement comes in the wake of the December shooting of Brian Thompson, head of UnitedHealthcare, which occurred outside a Hilton hotel in Manhattan.
Luigi Mangione, a 26-year-old suspect in the case, pleaded not guilty to federal charges connected to Thompson’s death last month, with a trial anticipated to start in 2026.

Tim Noel, who recently held the position of CEO within UnitedHealth’s Medicare and retirement division, has stepped in to lead the insurance arm after Thompson’s tragic passing.
Thompson’s murder has sparked a nationwide dialogue regarding the U.S. healthcare system and the frustrations many Americans face concerning its operation.
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Hemsley expressed optimism about the company’s future, noting that there are “tremendous opportunities to grow” as they aim to enhance healthcare services and achieve their growth targets of 13% to 16%.
The company has suspended its 2025 forecast due to a surge in care activity while expanding its range of benefits compared to the previous quarter.
Ticker | Security | Last | Change | Change % |
---|---|---|---|---|
UNH | UNITEDHEALTH GROUP INC. | 328.86 | -49.89 | -13.17% |
Additionally, the medical costs for many newly enrolled Medicare Advantage beneficiaries have exceeded expectations, although the company anticipates a return to growth in 2026.
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Hemsley will serve as both chairman and CEO, while Witty will take on a role as a senior advisor to Hemsley, the organization confirmed.
Hemsley has been with UnitedHealth Group since 1997, initially joining as chief operating officer, before ascending to president and later becoming chairman of the board in 2017.