UnitedHealth Group (UNH) was one of the worst-performing large-cap stocks of 2025. For the full year, shares fell roughly 33%.
This was due to several setbacks, including allegations of fraud and misconduct related to its billing practices, unexpectedly higher medical costs — particularly within its Medicare programs — and weak earnings results accompanied by poor forward guidance. On top of all of that, the company's CEO abruptly resigned.
