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 logistics specialist World Fuel Services (NYSE: INT) fell 13% as the company's second-quarter earnings report disappointed.

So what: The company's EPS actually beat estimates by a penny, with a profit of $0.68 per share, but revenue was short of expectations, coming in at $9.6 billion instead of the $10 billion analysts were annoying. EPS were also down slightly from the previous year's total, and investors seemed bothered by a -$105.7 million operating cash flow resulting from $160 million in downward adjustments because of inventory increases and deposits on fuel-related derivatives. A drop in jet-fuel prices also had a negative effect on the quarter, causing gross margins to shrink.

Now what: World Fuel Services benefits when fuel prices are high, so a resurgence in oil could improve its prospects in the rest of the year. Its financials look solid, and growth prospects are decent. I'd say the 13% drop is overdone. Investors looking for a point to get in might want to take advantage of today's sell-off.

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