Today, as part of an ongoing series looking into the bull and bear arguments for specific companies, Brenton discusses three reasons to consider selling Sirius XM Radio (Nasdaq: SIRI). While the company currently dominates its market, alternative options could pose serious competition into the future. What's more, management could see a big shakeup in the near future as Liberty Media (Nasdaq: LMCA) looks to increase its 46% stake and possibly take over the board. This could threaten the company’s stability as it tries to back its already-high valuation at 19 times forward earnings. The company has some upside as well, but these reasons should keep investors cautious.

Even Apple is making a move to become more integrated into cars going forward. As the most influential company in technology, that has to have a lot of companies paying attention. The real story for Apple, however, is the impending release of the iPhone 5 later this year. If you’re looking for a recommendation on how to play Apple along with continuing updates and guidance on the company whenever news breaks, we've created a brand new report that details when to buy and sell Apple. To get started, just click here now.