From The Street:
Short-sellers hate being caught short a stock that reports a blowout quarter. When this happens, we often see a tradable short squeeze develop as the bears rush to cover their positions to avoid big losses. Even the best short-sellers know that it’s never a great idea to stay short once a bullish earnings report sparks a big short-covering rally.
This is why I scan the market for heavily shorted stocks that are about to report earnings. You only need to find a few of these stocks in a year to help enhance your portfolio returns — the gains become so outsized in such a short time frame that your profits add up quickly.