UnitedHealth Group Inc. ( UNH ) suffered its worst trading day in over two decades on Thursday. Company's shares plummeted more than 22% after missing first-quarter earnings expectations and sharply cut its 2025 profit outlook. The decline, which erased roughly $140 billion in market value, dragged the Dow Jones Industrial Average down 1.2% and sent tremors through the broader healthcare sector. The health insurance behemoth reported adjusted earnings of $7.20 per share, falling short of the $7.29 anticipated by analysts, while revenue climbed to $109.6 billion—a 10% year-over-year increase but still under the $111.6 billion Wall Street forecasted. More damaging, however, was UnitedHealth's slashed forecast for 2025 earnings. The company now expects adjusted earnings of $26 to $26.50 per share, down sharply from its prior guidance of $29.50 to $30 per share. It marks a rare and significant reset for a company that had beaten top-line expectations in 17 of the previous 18 quarte...