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 JA Solar Holdings (Nasdaq: JASO) fell more than 12% in early trading before closing down 5%. The world's largest maker of solar cells reported worse than expected second-quarter results.

So what: Last year's $0.18-per-share profit turned into a $0.22-per-share loss. That wouldn't have been so bad save for Wall Street's estimates; analysts had been looking for a $0.195-per-share loss, Bloomberg reported.

Now what: CEO Peng Fang's comments were no less encouraging. In a statement, he said that "market conditions" and "inventory provisions" took a toll on both gross margin and earnings. A Q2 profit warning from LDK Solar (NYSE: LDK), issued this afternoon, lends credence to the concerns. Where do you stand on this stock? Would you buy at these levels? Weigh in using the comments box below.

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Fool contributorTim Beyers is a member of theMotley Fool Rule Breakers stock-picking team. He didn’t own shares in any of the companies mentioned in this article at the time of publication. Check out Tim'sportfolio holdings andFoolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insightsdelivered directly to your RSS reader.

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