Following strong share-price gains for Alphabet Inc. , and Microsoft Corp. stock's best performance in 15 years, Friday marked the first time since November 20, 2014 where there were three U.S.-listed companies with a market capitalization exceeding $400 billion. Alphabet, formally known as Google, almost joined Apple Inc. as the second company valued above $500 billion. Its stock soared 5.6% to close at $719.33, giving the company a valuation of $495 billion. Microsoft's stock soared 10% to $52.87, giving the company a market valuation of $422 billion. The last there there were three $400 billion companies, the companies were Apple, Microsoft and Exxon Mobil .
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