NRG Energy and UnitedHealth Are the S&P 500’s Best and Worst for May. Here’s Why.
NRG Energy and UnitedHealth Are the S&P 500’s Best and Worst for May. Here’s Why. · Barrons.com

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Investors flocked to shares of NRG as the energy supplier boosted capacity. UnitedHealth stock slumped, and the company’s CEO resigned.