DexCom and Domino’s Pizza Join the S&P 500. Should You Buy?

On May 12, medical device maker DexCom(NASDAQ:DXCM) and pie purveyor Domino’s Pizza(NYSE:DPZ) joined an exclusive club comprised of some of the most famous large-cap stocks: the S&P 500 index. DexCom replaces Allergan, which has been acquired. Domino’s sl…
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