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 Insituform Technologies (Nasdaq: INSU) fell 10% in trading late today.

So what: There wasn't any big news from the company today, but volume has spiked higher than usual and shares took a steady dive throughout the day. More than 650,000 shares traded hands versus the three-month average of 250,000 shares, and it looks like traders have gotten a hold of the stock.

Now what: Shares have been on a hot streak since November, so a pullback may have been in order today. Earnings for the fourth quarter will be released on Feb. 24, and investors may not want to take the possible volatility of earnings. I wouldn't panic on today's move; the long-term investment thesis hasn't taken any major blows today.

Interested in more info on Insituform Technologies? Add it to your watchlist.

Fool contributor Travis Hoium does not have a position in any company mentioned. You can follow Travis on Twitter at @FlushDrawFool, check out his personal stock holdings or follow his CAPS picks at TMFFlushDraw.

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