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 American Oriental Bioengineering (NYSE: AOB) rose 10% in intraday trading on unusually high volumes.

So what: The company released no news of note, but by 1:30 p.m. ET, trading had already reached 832,000 shares. This is much higher than the average daily volume of 420,000 and already near the monthly high of 889,000 shares.

Now what: A big volume day usually means a big buyer or seller is moving in the market. I couldn't find any news about the company recently, so I’m chalking this up as a typical wild movement in a small-cap stock. There's no reason to panic on the buy or sell side today, but it could be an opportunity if you’ve been looking for a good time to sell.

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Fool contributor Travis Hoium does not have a position in any company mentioned. Try any of our Foolish newsletter services free for 30 days. True to its name, The Motley Fool is made up of a motley assortment of writers and analysts, each with a unique perspective; sometimes we agree, sometimes we disagree, but we all believe in the power of learning from each other through our Foolish community. The Motley Fool has a disclosure policy.