(Reuters) - The S&P 500 and the Nasdaq Composite index opened flat on Wednesday, ahead of President-elect Donald Trump's first formal news conference, where he is expected to give more insight into his plans to boost economic growth.

The Dow Jones Industrial Average <.DJI> was up 20.7 points, or 0.1 percent, at 19,876.23, helped by gains in Merck <MRK.N>.

The S&P 500 <.SPX> was down 0.21 points, or 0.009256 percent, at 2,268.69 and the Nasdaq Composite <.IXIC> was up 2.02 points, or 0.04 percent, at 5,553.84.

(Reporting by Yashaswini Swamynathan in Bengaluru; Editing by Savio D'Souza)


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