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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