Sirius XM Radio (SIRI)

SIRIUS defines subscriber acquisition costs, or SAC, as costs of incentives for the purchase, installation, and activation of SIRIUS radios, as well as subsidies paid to radio and chip set manufacturers, automakers and retailers and the negative margin on equipment sales.

Adjusted loss from operations, ARPU and SAC are not measures of financial performance under U.S. generally accepted accounting principles. 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 the company’s Annual Report on Form 10-K for the year ended December 31, 2003 filed with the Securities and Exchange Commission. Among the key factors that have a direct bearing on the company’s results of operations are: the company’s dependence upon third parties to manufacture, distribute, market and sell SIRIUS radios and components for those radios; the unproven market for SIRIUS service; SIRIUS’ competitive position; changes to our business plan or strategy and any events which affect the useful life of the company’s satellites.