Warren Buffett is widely regarded as one of the best investors of all time, and it isn't hard to see why. His holding company Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) has returned an average of 20.1% annually since 1965, almost double the S&P 500 average. But past performance doesn't necessarily reflect future performance, and some companies in Buffett's portfolio aren't pulling their weight.

Let's discuss why Sirius XM (NASDAQ: SIRI) and Kraft Heinz (NASDAQ: KHC) shouldn't be on your investment radar.

Sirius XM is a satellite radio company that became a practical monopoly after merging with its only rival in 2008. Berkshire owns the stock indirectly through its various stakes in Liberty Media, which controls 81% of its equity. But despite its high-profile backers, Sirius is performing poorly, with its shares down a whopping 37% in 2023 alone.

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Source Fool.com