Few stocks have been as resilient as UnitedHealth Group ( UNH 8.14%). The company operates the largest health insurance business in the U.S. It runs the second biggest pharmacy benefits manager (PBM).

UnitedHealth Group has been a reliable megacap for years. Its sudden decline in recent months is raising questions about the future fate of its stock.

UnitedHealth volatility highlights a key difference between the Dow and the S&P 500. UnitedHealth’s sharp decline and ...

S&P 500 E-Mini futures (ESM25) are down -0.33%, andJune Nasdaq 100 E-Mini futures (NQM25) are down -0.49% this morning, ...