Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of auto-parts supplier Dana Holding (NYSE: DAN) rose 10% today after reporting better-than-expected earnings.

So what: First-quarter revenue rose 10% to $1.98 billion, just barely beating estimates. Earnings per share were also strong, reaching $0.44 per share, $0.03 better than estimates. Commercial and off-highway vehicle sales were the drivers of this quarter's results.

Now what: The U.S. truck market appears to be on the comeback, and sales to companies making these trucks has helped Dana Holding. The commercial vehicle segment grew 16% in the quarter, just another sign that the economy is getting back on its feet. Shares are trading at just seven times forward estimates, and I think this is the time to jump in before the stock starts to take off.

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