Michael Nagle / Bloomberg via Getty Images Shares of UnitedHealth Group have lost about 28% of their value in 2025 so far. Key Takeaways UnitedHealth posted quarterly earnings that topped analysts' estimates and raised its 2025 outlook. The strong earnings come after a series of setbacks that sent the health insurer's stock tumbling earlier this year, including an investigation into its Medicare billing practices. America's biggest insurer is showing some signs of improvement in the health of its bu ...