The growing popularity of Internet radio may be opening a mixed bag for Sirius XM Radio shareholders, even though its stock hit a 52-week high today.
"This company has gotten its mojo back, no question about it. The stock has doubled. It's got a $5 billion dollar market cap today. It's really benefiting from the uplife in auto sales—it's doing quite well," Rob Cox, US Editor for Reuters Breaking Views, told CNBC's "
Aside from car and truck sales, online music sites are making big inroads through the explosion in mobile devices. "If you look at Pandora alone, they've got 65 million in registered listeners in the US. They got 19 million of them on iPhone apps alone, which is equal to the number of subscribers that Sirius has," Cox said.