SIRIUS XM Radio Announces Second Quarter 2008 Results Conference Call

Company to Webcast Earnings Call for Investors and Media

SIRIUS XM Radio today announced that it plans to
release second quarter 2008 financial and operating results on
Thursday, August 7, 2008.

SIRIUS
XM also plans to hold a conference call at 8:00 am ET to discuss these
results. Investors and the press can listen to the conference call via
the company’s website, www.sirius.com and on its satellite radio service by tuning to SIRIUS channel 119 or XM Live, channel 120.

A replay of the call will be available on www.sirius.com.