Stephen Hemsley hasn’t been CEO at UnitedHealth Group in nearly a decade yet he’s never really left. Hemsley, 72, has remained chairman and a major shareholder in the health care behemoth — and now is back in the CEO

Shares of UnitedHealth Group ( UNH -14.89%) are falling on Thursday. The company's stock has plummeted 15% as of 11:33 a.m. ET but lost as much as 19.2% earlier in the day. The collapse comes as the S&P 500 gained 0.1% and the Nasdaq Composite fell 0.4%.

UnitedHealth Group's stock has plunged nearly 50% due to the CEO resignation, withdrawal of guidance, and ongoing legal issues, creating a potential buying opportunity. The stock is deeply oversold with an RSI of 15, trading below both the 200-day and 50-day moving averages, indicating capitulation.

Stephen Hemsley ran UnitedHealth Group for more than a decade. It's a different company after four years with Andrew Witty in charge.

Wall Street is wary of UnitedHealth Group's (UNH) near-term prospects after the company's sudden CEO shake-up and its pulling of 2025 financial guidance on Tuesday. Bank of America Securities, for one,

UnitedHealth Group Incorporated's stock faces a steep decline amid leadership turmoil, regulatory pressures, and rising costs. Click to read why UNH is a Hold.

UnitedHealth Group CEO Stephen Hemsley, who replaced Andrew Witty, said he has the right strategy in place “for the era ahead.”

UnitedHealth Group Chairman Stephen Hemsley is returning to helm the health care conglomerate once again. He will replace Andrew Witty effective immediately.