U.S. stocks opened slightly higher on Wednesday, rebounding after two sessions of losses, though investors remained reluctant to make big bets ahead of a number of potentially market-moving events. A European Central Bank policy meeting and the U.K. general election on Thursday, as well as former Federal Bureau of Investigation Director James Comey's congressional testimony have left investors cautious. The S&P 500 opened 2 points, or 0.1%, higher at 2,431. The Nasdaq Composite was up 15 points, or 0.3%, to 6,291 at the open. The Dow Jones Industrial Average began the session up 20 points, or 0.1%, at 21,157.
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