Stock Market Today, Jan. 27: Dow Sinks As UnitedHealth Plummets, Tech Stocks Boost S&P 500 and Nasdaq

The S&P 500 (^GSPC 0.03%) rose 0.41% to 6,978.58, notching another record close; the Nasdaq Composite (^IXIC +0.06%) gained 0.91% to 23,817.10 on t…

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