U.S. stocks open slightly lower ahead of Yellen speech

U.S. stocks opened slightly lower on Wednesday as investors remained focused on central bankers and policy hints. The main indexes pulled back after solid gains during the previous session. The S&P 500 opened a point lower at 2,101. The Dow Jones Industrial Average slipped 19 points, or 0.1%, to 17,867 at the open. The Nasdaq Composite began the day up 2 points at 5,159.

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