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 independent medical exam provider ExamWorks (Nasdaq: EXAM) jumped 13% in intraday trading on higher-than-average volume.

So what: The move today came without any news from the company. In fact, it couldn't have come from company news since ExamWorks is still in its "quiet period" following its late-October initial public offering. Though the company's current market value is nearly $600 million, the average daily dollar volume is relatively low, meaning that any large buyer that gets interested in the stock may end up pushing up the price.

Now what: ExamWorks is a pretty neat business -- it's a roll-up of small IME providers that perform medical exams for insurers like Progressive (NYSE: PGR), law firms, and government agencies. Richard Perlman, who most recently led TurboChef to a sale to competitor Middleby (Nasdaq: MIDD), is the chairman of the company, and it looks as if he'll be targeting growth primarily through continued acquisitions of smaller IME providers. While the business model piques my interest, the financials should put investors on their guard. Though ExamWorks has rapidly expanded its revenue and operating profit via its acquisitions, it has also racked up a bunch of debt and doesn't have much of an operating history for us to hang our hats on. This could be an interesting stock to watch, but it would definitely end up on my "speculative ideas" list.

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or on his RSS feed. The Fool’s disclosure policy assures you no Wookiees were harmed in the making of this article.