Without further ado, here's a look at our list of large-cap short squeeze opportunities. >>4 Reasons to Buy Stocks in 2013Sirius XM Radio It's been a rough year for Sirius XM Radio ( SIRI) short sellers. This stock has risen more than 39% in the last 12 months, shellacking anyone who's bet against shares over that time. But that hasn't reduced the number of shares being shorted right now; it's increased it. As I write, SIRI has a short interest ratio of 10.3, which indicates that it would take more than two weeks of nonstop buying at current volume levels for shorts to cover their positions. Sirius XM has made a serious transformation since the combination of rivals Sirius and XM back in 2008. The firm today boasts 23.9 million subscribers, and increased subscription revenues have converted Sirius XM from a cash burner into a profitable business (much to the chagrin of shorts). Some big tailwinds for SIRI right now include strength in auto sales (two thirds of new cards come with Sirius XM receivers installed) and increased online streaming coverage. Put simply, if Sirius can continue to court more customers, or if it can convince existing customers to pay more, the firm benefits. There are a few challenges facing Sirius XM right now to be sure. Increased in-car online connectivity means that streaming services like Pandora (P) can threaten the firm's positioning in the auto market. And ongoing drama with top shareholder Liberty Media keeps investors on their toes as well. But the short sellers are overdoing it in this stock, and that makes SIRI a prime short squeeze candidate this month. Sysco Even though Sysco ( SYY) may not be a household restaurant name per se, it probably should be. That's because Sysco makes the food served at more than 400,000 restaurants, hotels and institutional dining facilities around the globe. As the biggest food service distributor in North America, Sysco has some big advantages. But that hasn't stopped short sellers from unloading this stock.A short interest ratio of 12 means that it would take two-and-a-half weeks for shorts to exit their positions in this company.