Markets have memories.

This means a particular level could be important for a long time. The importance may last for weeks, months, or even years.

This is why shares of Vertex Energy, Inc. (NASDAQ:VTNR) may soon hit resistance.

Vertex has soared by over 500% in just one week. This was the result of an analyst upgrade and news about the company buying a refinery.

Back in June of 2014, shares staged a strong rally as well. Once they reached to $11,  sellers flooded the market. The rally ended and a sell-off followed.

There's a chance the stock runs into resistance at $11 once more. This market may have a good long-term memory.