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 Universal Display (Nasdaq: PANL) slumped 10% in early trading and remain off more than 6% as the closing bell approaches.

So what: The selloff appears to amount to profit-taking after last week's remarkable run, fueled by much better-than-expected second-quarter results. The OLED supplier may finally be on the way to producing sustainable profits.

Now what: Of course, that'll depend on having customers such as Sony (NYSE: SNE) and Motorola Solutions (NYSE: MSI) making good on using its parts to produce high-quality, low-power consumer electronics. Do you agree? Would you buy shares of Universal Display 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.

Motley Fool newsletter services have recommended buying shares of Universal Display. Try any of our Foolish newsletter servicesfree for 30 days. We Fools don't all hold the same opinions, but we all believe thatconsidering a diverse range of insights makes us better investors. The Motley Fool has adisclosure policy.