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UnitedHealth Group (UNH), a health insurance and managed care sector company, has rarely looked as vulnerable as it did in 2025. Long viewed as a dependable compounder within the Dow Jones Industrial Average ($DOWI), the stock instead slid into crisis mode.
A sharp rise in Medicare Advantage costs caught management off guard, while a Department of Justice criminal investigation into Medicare practices added pressure. The turmoil deepened after the sudden loss of CEO Brian Thompson in late 2024, followed by earnings misses and a disappointing full-year outlook. Shares quickly fell below the $600 mark, turning UNH stock into the Dow’s worst-performing stock of 2025.