[Satellite TODAY 01-06-12] SiriusXM Radio ended 2011 with nearly 21.9 million subscribers after adding approximately 540,000 net new subscribers in its 2011 fiscal fourth quarter and 1.7 million new customers for the full year, the satellite radio broadcaster confirmed Jan. 4.

   SiriusXM CEO Mel Karmazin said the results, which were based on preliminary subscriber data, allowed company management to reiterate SiriusXM’s existing financial guidance for 2011 and 2012.

   “Our subscriber growth accelerated in 2011 as net additions grew approximately 20 percent, delivering our best year for net additions since the merger and demonstrating the strong continuing demand for our unmatched audio content,” Karmazin said in a statement.

   SiriusXM is scheduled to announce 2012 subscriber guidance and complete 2011 results in February.