Hang on to your hats, Fools. Earnings season is in full swing, and shares of 3D Systems (NYSE:DDD)Lumber Liquidators (NYSE:LL), and Zillow (NASDAQ:ZG) are primed to make big moves in the week ahead. That's because all three of these companies are not only reporting earnings, but they're all heavily shorted as well.

When these two variables combine, volatility is almost always the result. For proof, check out the three stocks I highlighted earlier this month, which moved an average of 15% following their respective quarterly releases.

But don't be (lowercase "f") fooled: I don't think you should try to turn a quick buck from these moves. That's because it's impossible to tell if these stocks will move up or down. Instead, I think it's best for current shareholders of these three companies to check out the following slideshow, prepare for the volatility, and know what's really important to keep an eye on.