After a glance at Berkshire Hathaway's public equities portfolio, you'll quickly realize that just a handful of businesses dominate. I'm talking about Apple, Bank of America, and American Express, which -- combined -- constitute an astounding 63.8% of its holdings.

But there are also little-known positions like Sirius XM Holdings (NASDAQ: SIRI). This audio entertainment stock makes up a tiny portion of the overall portfolio and has fallen 15% in the last five years.

Despite the Oracle of Omaha and his team's stamp of approval, there are three reasons to avoid this company. Let's take a closer look at the problems with Sirius XM.

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Source Fool.com