PRINCETON, N.J.--(BUSINESS WIRE)--NRG Energy, Inc.’s (NYSE: NRG) common stock was added to the Standard and Poor’s 500 Index after the market close today. The S&P 500, a market-value-weighted index, is the world’s most followed stock market measure and is seen as the benchmark standard to measure overall U.S. equity market performance. “We are honored to be grouped among the most-widely held companies in leading industries across the country,’’ David Crane
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