XM Satellite Radio Holdings Inc. Announces Third Quarter 2007 Results

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Largest Quarter for New OEM Additions Fuels Year-Over-Year Third Quarter
Gains in Gross and Net Subscribers; Third Quarter Ending Subscribers Exceed
8.5 Million; Year-Over-Year Revenue Increases 20 Percent

WASHINGTON, Oct. 25 /PRNewswire-FirstCall/ — XM Satellite Radio Holdings
Inc. (NASDAQ: XMSR) today announced earnings for the three-month period ended
September 30, 2007. Revenue for the 2007 third quarter increased approximately
20 percent year over year to $287 million compared to $240 million in the 2006
third quarter.

XM ended the 2007 third quarter with approximately 8.57 million subscribers
compared to approximately 7.19 million subscribers in the prior year period.