U.S. stock-market indexes opened slightly higher on Wednesday, hovering near record levels a day after Dow industrials saw their biggest one-day reversal in almost two years. Investors continued to focus on earnings releases, including results from Bank of America and Goldman Sachs. The S&P 500 gained 6 points, or 0.2%, to 2,782. The tech-heavy Nasdaq Composite index advanced by 19 points, or 0.2%, to 7,243. The Dow Jones Industrial Average rose 110 points, or 0.4%, to 25,908. Among the best performers on Wall Street, shares of IBM rose sharply, after analysts at Barclays upgraded the stock to overweight from underweight.