Celanese

The U.S. stock market closed out a volatile week of trading with solid gains for the S&P 500 and the Nasdaq Composite.The Dow closed the session up only 10 points, however, after IBM plunged in the wake of a weak fiscal first-quarter earnings report. Investors snapped up technology names after strong results from bellwethers Google and Microsoft, which drove the outperformance in the Nasdaq.Despite the gains, it was the worst week for the S&P 500 since last November, with the index falling better than 2 percent on concerns about global growth. Nevertheless, the week ended on an upbeat note as the CBOE Volatility Index gave back a good portion of its earlier gains on the back of investor confidence that the recent pullback will be short lived.Major AveragesThe Dow Jones Industrial Average rose 10 points, or 0.07 percent, to just below 14,548.The S&P 500 jumped almost 14 points, or 0.88 percent, to 1,555.The Nasdaq Composite rose 40 points, or 1.25 percent, to close at 3,206.CommoditiesE...

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