This Warren Buffett Stock Has 22% Downside, According to 1 Wall Street Analyst

Sirius XM faces determined competition from audio streamers, which is a rising challenge.Sirius XM (SIRI -1.22%) has been an equity holding of Warren Buffett's investment vehicle Berkshire Hathaway for years. Not everything the star investor touches turns to gold, however, and the satellite radio broadcaster is poised to keep being an underperformer.At least, that's the call of one prognosticator tracking Sirius XM's fortunes. He thinks the company's shares are a sell, as they're standing in front of a doub ...