Market Cap: $3.89 billion Industry: Radio Broadcasting Sirius XM Radio ( SIRI) is the owner of two subsidiaries: XM Satellite Radio Holdings Inc. and Satellite CD Radio Inc. The company broadcasts music, sports, news talk, entertainment, traffic and weather channels across the United States for a subscription fee. Combined, the two companies have eight in-orbit satellites and nearly 800 terrestrial repeaters. This penny stock has fared very well in 2010, and is up 67.5% year-to-date, against marginal losses by the broader markets. In its last income statement, SIRI reported revenue of $2.66 billion along with a quarterly revenue growth of 18.4% year-over-year.