Shares of the satellite radio operator pulled back on a middling earnings report. Shares of SiriusXM Radio (SIRI -7.26%) were pulling back today, after the satellite radio provider posted middling results in its first-quarter earnings report. Though it topped revenue estimates, full-year guidance was below expectations, and underlying growth remained weak. As a result, the stock was down 4.9% as of 12:27 p.m. ET. Sirius struggles to grow Sirius continued to lose self-pay subscribers, falling 359,000 to 33 m ...