Simply put, greater access to health insurance has led to more customers for the insurance giants. And UnitedHealth is not the only company to benefit.
The other four members of the so-called Big Five health insurers — Aetna (AET), Cigna (CI), Humana (HUM), and Anthem (ANTM) (formerly WellPoint) — have all beaten the S&P 500 over the past five years or so as well.
Related: How much Obama would raise the capital gains tax rate
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