Addition of 135,000 Subscribers in Q1 ’03; XM on Target to Exceed One Million Subscribers During 2003

XM Satellite Radio
announced today it has signed up 483,075 subscribers,
furthering its march to one million subscribers and solidifying its market
leadership in digital satellite radio. XM added more than 135,000 subscribers
in the first quarter of 2003.

“XM started 2003 on a very strong note,” said XM President and CEO, Hugh
Panero. “The company’s accelerated subscriber growth is fueled by the
critically acclaimed Delphi XM SKYFi Radio, which is penetrating the home,
portable and automotive market, and XM’s availability in new General Motors’
vehicles.”

“In the face of a sluggish economy, XM’s ability to attract new listeners
and its overall performance continue to be exemplary,” Panero added. “Clearly,
the critical milestone of one-half million subscribers is visible on the
horizon and we will reach it shortly.”

As a portable complement to XM’s best-selling automotive and in-home
units, the new Delphi SKYFi “boom box” satellite radio has experienced
outstanding sales helping to spur the large numbers of loyal, new customers
signing up with XM.

About XM

XM is the rebirth of radio. XM’s innovative programming approach features
101 coast-to-coast digital channels: 70 music channels, many of them
commercial-free, from hip hop to opera, classical to country, bluegrass to
blues; and 31 channels of sports, talk, children’s and entertainment. XM’s
strategic investors number America’s leading car and media companies,
including General Motors, American Honda Motor Co. Inc., Clear Channel
Communications, DIRECTV and The Hearst Corporation.

XM radios are available at major electronics retailers nationwide.
Leading manufacturers such as Sony, Alpine, Pioneer and Delphi offer a broad
array of XM radios that easily enable any existing car stereo system. For more
information, please visit XM’s web site: http://www.xmradio.com .

Factors that could cause actual results to differ materially from those in
the forward-looking statements in this press release include demand for the
company’s service, the company’s dependence on third party vendors, its
potential need for additional financing, as well as other risks described in
XM Satellite Radio Holdings Inc.’s Form 10-K filed with the Securities and
Exchange Commission on 3-31-2003. Copies of the filing are available upon
request from XM Radio’s Investor Relations Department.