It's the only satellite radio provider, but this isn't such a big advantage now that nearly all of its customers already pay for mobile internet service.

Berkshire Hathaway owns 31% of Sirius XM Holdings, the satellite-radio company, and one of Berkshire’s investment managers also holds an interest in the company.Berkshire held 105.2 million shares of Sirius XM as of Sept.

Sirius XM Holdings (NASDAQ: SIRI) has now completed its combination with media mogul John Malone's controlling stake in the satellite radio platform. The Liberty Sirius XM Group tracking shares that were a distraction and historically traded at a wide discount to the common shares were officially absorbed into the main company after Monday's market close.

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However, Deutsche Bank analyst Ed Yu believes investors should take advantage of the dip. Yu resumed coverage of Tesla recently, rating the stock a buy and giving it a $295 price target -- about 30% above its current level.