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 fuel services expert World Fuel Services (NYSE: INT) have seen some high-octane action today, jumping as much as 10.6% on higher than average trading volume.

So what: The company's fourth-quarter report easily bludgeoned analyst estimates, driven by strength in its land-based services. The stock has returned a dividend-adjusted 58% over the last year and a mindblowing 1,840% in the last decade.

Now what: Even after all those tremendous gains, fellow Fool Rex Moore still sees a deep value in this stock. World Fuel's margins are vanishingly thin, but the company processes a massive and growing volume of business, which adds up to tremendous profits. If the company could widen those margins just a little bit, the potential gains would be epic.

Interested in more info on World Fuel Services? Add it to your watchlist.