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 blue-collar staffing specialist TrueBlue (NYSE: TBI) got worked over today, losing as much as 18% in intraday trading after reporting disappointing fourth-quarter results.

So what: The company, which is behind brands such as Labor Ready and PlaneTechs, reported fourth-quarter results that showed a significant advance from last year. Total revenue climbed 19% while earnings per share jumped from $0.05 to $0.09. The growth wasn't enough for Wall Street though since analysts had expected that the company would report $0.12 in per-share profit for the quarter.

Now what: TrueBlue has had a strong bounce-back after a dismal 2008, but it still has a ways to go before it returns to its pre-recession levels. Analysts had been projecting a per-share profit jump to $0.74 in 2011, but it wouldn't be surprising if they tempered those expectations a bit after the shortfall in the fourth quarter.

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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 prefers dividends over a sharp stick in the eye.