NEW YORK ( TheStreet) -- Although shares of Sirius XM (SIRI - Get Report) have been on fire all year, up well over 30%, there are many who still question whether the company's business model is sustainable.There's no other explanation for the fact that the company's short interest position, which is now up to 353 million shares, has steadily grown. This has occurred even as Sirius continues to post strong subscriber growth numbers.
Sirius XM Steadily Overcoming Investor Doubts
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