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 solar-product maker SunEdison (NASDAQOTH:SUNEQ) dropped as much as 29% today after the company reported earnings.

So what: Second-quarter revenue fell 39% to $491.6 million and the company lost $0.19 per share. That compares to estimates of $443.3 million in revenue and a $0.13 loss so the results were mixed based on Wall Street's expectations.  

Now what: This is part of a broader solar sell-off today but it does show weakness in SunEdison's business. The company is still supplying a commodity product to the industry so, until prices improve, investors shouldn't expect higher profits. I'd stay away from this stock for now but watch for improvement in demand, and keep an eye on margins in the systems business, because that's really where the company sees its future.

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