U.S. stocks made a tepid move higher Wednesday morning, putting the three main indexes on pace to extend a multiday climb to three days amid uncertainty surrounding Thursday's U.K. referendum on European Union membership. Investors were also bracing for a second day of congressional testimony from Federal Reserve Chairwoman Janet Yellen starting at 10 a.m. Eastern Time. The Dow Jones Industrial Average opened 23 points, or 0.1%, higher to 17,840, the S&P 500 rose 3 points, or 0.2%, to 2,092, while the Nasdaq Composite Index tacked on 6 points, or 0.1%, to 4,849. Meanwhile, Tesla Motors Inc. was in the spotlight after the electric-car company headed by Elon Musk offered to buy SolarCity Corp. late Tuesday.
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