UnitedHealth Replaces CEO as Its Medicare Strategy Sputters

UnitedHealth Group Inc. unexpectedly replaced its chief executive and suspended earnings guidance, raising increasing questions over how the company once regarded as a safe bet by investors has got its cost predictions so wrong.

The company brought back Chairman and former CEO Stephen Hemsley for the top role, saying Andrew Witty has resigned “for personal reasons.” The health insurer, whose top insurance executive was murdered in New York last December, also ripped up its 2025 outlook.