Sirius XM Radio (SIRI)

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
TO BE HELD ON TUESDAY, MAY 23, 2006

To our Stockholders:

      You are cordially invited to attend our Annual Meeting of Stockholders, which will be held on Tuesday, May 23, 2006, at 9:00 a.m., New York City time, in The Auditorium at The Equitable Center, 787 Seventh Avenue, New York, New York 10019. The annual meeting is being held to:

      1. Elect eight directors.

      2. Transact any other business that may properly come before the meeting.

      Only stockholders of record at the close of business on April 3, 2006 are entitled to vote at the annual meeting. A list of stockholders entitled to vote will be available for examination for the ten days prior to the annual meeting, between the hours of 9:00 a.m. and 4:00 p.m., New York City time, at our offices at 1221 Avenue of the Americas, 36th Floor, New York, New York 10020.

      Whether or not you expect to attend in person, we urge you to vote your shares via the Internet, by phone, or by signing, dating, and returning the enclosed proxy card at your earliest convenience. This will ensure the presence of a quorum at the meeting. If you wish to vote your shares by mail, an addressed envelope for which no postage is required if mailed in the United States is enclosed.

      Voting over the Internet or by telephone is fast, convenient, and your vote is immediately confirmed and tabulated. Most important, by using the Internet or telephone, you help us reduce postage and proxy tabulation costs. Please do not return the enclosed paper ballot if you are voting over the Internet or by telephone.