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: Aegean Marine Petroleum (NYSE: ANW) shares tanked 34% today after the company reported earnings.

So what: The Greece-based company reported adjusted profit of $0.16 per share well below the estimate of $0.35 per share. The company blamed lower margins and slow tanker traffic for the miss.

Now what: Tanker shipping rates have been under pressure, causing tankers to go hunting for low-cost fuel. I don't see rates picking up quickly, so I'm inclined to see this drop more as a sign of things to come than a new value in the stock. Tankers may be bargain hunting at Aegean, but it isn't time for you to do the same.

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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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