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 marine fueling company Aegean Marine Petroleum Network (NYSE:ANW) jumped 12% today after the company was upgraded by an analyst.

So what: Coverage was initiated by analysts at Stifel with a buy rating and a $14 price target. That would still be more than a 40% increase from the stock's highest trading price today.  

Now what: Stocks can often pop or drop based on an analyst upgrade or downgrade, but Wall Street has little incentive to be correct about these calls and isn't any better at outperforming the market than flipping a coin. Instead, investors should look at the fundamentals and the company's financial trajectory. Earnings have fallen the past two quarters and the stock trades at a lofty 21 times trailing earnings. That's a steep price for a company that has little growth going forward.

Fool contributor Travis Hoium has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.