Sirius XM Radio (SIRI)

SIRIUS defines subscriber acquisition costs, or SAC, per gross subscriber addition as SAC and negative margins from the direct sale of SIRIUS radios and accessories divided by the number of gross subscriber additions for the period.

Adjusted loss from operations, ARPU and SAC per gross subscriber addition are not measures of financial performance under U.S. generally accepted accounting principles and are used as measures of operating performance. As a result, these metrics may be susceptible to varying calculations; may not be comparable to other similarly titled measures of other companies; and should not be considered in isolation or as a substitute for measures of financial performance prepared in accordance with U.S. generally accepted accounting principles.

SIRIUS defines subscriber acquisition costs, or SAC, per gross subscriber addition as SAC and the negative margin from the direct sale of SIRIUS radios and accessories divided by the number of gross subscriber additions for the period.

Adjusted loss from operations, ARPU and SAC per gross subscriber addition are not measures of financial performance under U.S. generally accepted accounting principles and are used as measures of operating performance. As a result, these metrics may be susceptible to varying calculations; may not be comparable to other similarly titled measures of other companies; and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with U.S. generally accepted accounting principles.

SIRIUS defines subscriber acquisition costs, or SAC, per gross subscriber addition as SAC and the negative margin from the direct sale of SIRIUS radios and accessories over the number of gross subscriber additions for the period.

Adjusted loss from operations, ARPU and SAC per gross subscriber addition are not measures of financial performance under U.S. generally accepted accounting principles and are used as measures of operating performance. As a result, these metrics may be susceptible to varying calculations; may not be comparable to other similarly titled measures of other companies; and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with U.S. generally accepted accounting principles.

Any statements that express, or involve discussions as to, expectations, beliefs, plans, objectives, assumptions, future events or performance with respect to SIRIUS Satellite Radio Inc. are not historical facts and may be forward-looking and, accordingly, such statements involve estimates, assumptions and uncertainties which could cause actual results to differ materially from those expressed in any forward-looking statements. Accordingly, any such statements are qualified in their entirety by reference to the factors discussed in our Annual Report on Form 10-K for the year ended December 31, 2004 filed with the Securities and Exchange Commission. Among the key factors that have a direct bearing on our operational results are: our dependence upon third parties, including manufacturers of SIRIUS radios, retailers, automakers and programming partners, our competitive position and any events which affect the useful life of our satellites.