AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 17, 2003



                                                     REGISTRATION NO. 333-108387

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------

                                AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                              -------------------
                          SIRIUS SATELLITE RADIO INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                              -------------------
           DELAWARE                                            52-1700207
(STATE OR OTHER JURISDICTION OF                             (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)                             IDENTIFICATION NO.)
                              -------------------
                    1221 AVENUE OF THE AMERICAS, 36TH FLOOR
                            NEW YORK, NEW YORK 10020
                                  212-584-5100

              (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                              -------------------
                              PATRICK L. DONNELLY
            EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                          SIRIUS SATELLITE RADIO INC.
                    1221 AVENUE OF THE AMERICAS, 36TH FLOOR
                            NEW YORK, NEW YORK 10020
                                  212-584-5100

           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)
                              -------------------
                                    COPY TO:

                                GARY L. SELLERS
                         SIMPSON THACHER & BARTLETT LLP
                              425 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10017
                                  212-455-2000
                              -------------------
    APPROXIMATE DATE OF PROPOSED SALE TO THE PUBLIC: From time to time, after
this Registration Statement becomes effective.

    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box. [x]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ] ________________

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ] ________________

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

    Pursuant to Rule 429 under the Securities Act of 1933, as amended, the
prospectus herein also relates to the remaining $14,812,500 of Debt Securities,
Preferred Stock, Common Stock and Warrants registered on Form S-3 (Registration
No. 333-64344) of Sirius Satellite Radio Inc., which was declared effective on
December 21, 2001. A filing fee of $125,000 was previously paid for the
registration of securities under such prior registration statement. This
Registration Statement also constitutes Post-Effective Amendment No. 1 to
Registration Statement No. 333-64344 and upon the effectiveness of such
Post-Effective Amendment, this Registration Statement and Registration Statement
No. 333-64344 will relate to an aggregate of $514,812,500 of Debt Securities,
Preferred Stock, Common Stock and Warrants of Sirius Satellite Radio Inc.

                              -------------------
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

================================================================================






THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND WE ARE NOT SOLICITING OFFERS TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.


                             SUBJECT TO COMPLETION
                 PRELIMINARY PROSPECTUS DATED NOVEMBER 17, 2003


PROSPECTUS
----------
                                  $500,000,000
                                  [SIRIUS LOGO]

                       DEBT SECURITIES, PREFERRED STOCK,
                           COMMON STOCK AND WARRANTS

We from time to time may offer:

  secured or unsecured debt securities in one or more series;

  shares of preferred stock in one or more series;

  shares of common stock;

  warrants or other rights to purchase debt securities, preferred stock or
  common stock or any combination of securities; and

  any combination of debt securities, preferred stock, common stock or warrants,

at an aggregate initial public offering price not to exceed $500,000,000.

The number, amount, prices, net proceeds to Sirius Satellite Radio Inc. and
specific terms of the securities will be determined at or before the time of
sale and will be set forth in an accompanying prospectus supplement.

The net proceeds to us from the sale of the securities will be the initial
public offering price or the purchase price of those securities less any
applicable commission or discount, and less any other expenses we incur in
connection with the issuance and distribution of those securities.

If any agents or any underwriters are involved in the sale of the foregoing
securities, their names and any applicable commission or discount will be set
forth in the accompanying prospectus supplement.

This prospectus may not be used for the sale of any securities unless it is
accompanied by a prospectus supplement. The accompanying prospectus supplement
may modify or supersede any statement in this prospectus.

                 Nasdaq National Market trading symbol: 'SIRI.'

    INVESTING IN OUR SECURITIES INVOLVES RISK, INCLUDING THE RISKS DESCRIBED IN
THE DOCUMENTS INCORPORATED BY REFERENCE IN THIS PROSPECTUS. YOU SHOULD CAREFULLY
CONSIDER THE IMPORTANT RISK FACTORS SET FORTH IN THE DOCUMENTS INCORPORATED BY
REFERENCE IN THIS PROSPECTUS AND IN THE ACCOMPANYING PROSPECTUS SUPPLEMENT
BEFORE INVESTING IN OUR SECURITIES.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.
                            ----------------------------

                The date of this prospectus is          , 2003.






                               TABLE OF CONTENTS



                                                                            PAGE
                                                                            ----
                                                                         
Special Note Regarding Forward-Looking Statements...........................  2
About This Prospectus.......................................................  3
About Sirius................................................................  3
Risk Factors................................................................  4
Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends...  4
Use of Proceeds.............................................................  4
Description of Debt Securities..............................................  5
Description of Capital Stock................................................ 17
Description of Warrants..................................................... 21
Plan of Distribution........................................................ 25
Legal Matters............................................................... 26
Experts..................................................................... 26
Incorporation by Reference.................................................. 27
Where You May Find Additional Available Information About Us................ 27

                              -------------------
    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS AND THE
OTHER DOCUMENTS TO WHICH WE HAVE REFERRED YOU. WE HAVE NOT AUTHORIZED ANYONE TO
PROVIDE YOU WITH INFORMATION THAT IS DIFFERENT. THIS PROSPECTUS MAY ONLY BE USED
WHERE IT IS LEGAL TO SELL THESE SECURITIES. THE INFORMATION IN THIS PROSPECTUS
MAY ONLY BE ACCURATE ON THE DATE OF THIS PROSPECTUS.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    The following cautionary statements identify important factors that could
cause our actual results to differ materially from those projected in the
forward-looking statements made in this prospectus. Any statements about our
beliefs, plans, objectives, expectations, assumptions or future events or
performance are not historical facts and may be forward-looking. These
statements are often, but not always, made through the use of words or phrases
such as 'will likely result,' 'are expected to,' 'will continue,' 'is
anticipated,' 'estimated,' 'intends,' 'plans,' 'projection' and 'outlook.' Any
forward-looking statements are qualified in their entirety by reference to the
factors discussed throughout this prospectus, and particularly the risk factors
described under 'Risk Factors' in this prospectus. Among the significant factors
that could cause our actual results to differ materially from those expressed in
the forward-looking statements are:


   our competitive position, as XM Satellite Radio, the other satellite radio
   service provider in the United States, has substantially more subscribers
   than us and may have certain competitive advantages;

   our dependence upon third parties to manufacture, distribute, market and sell
   SIRIUS radios and components for those radios;

   the unproven market for our service; and

   the useful life of our satellites, which have experienced circuit failures
   on their solar arrays and may not be covered by insurance.

    The risk factors referred to above could cause actual results or outcomes to
differ materially from those expressed in any forward-looking statements made by
us or on our behalf. Accordingly, you should not place undue reliance on any of
these forward-looking statements. In addition, any forward-looking statement
speaks only as of the date on which it is made, and we undertake no obligation
to update any forward-looking statement or statements to reflect events or
circumstances after the date on which the statement is made, to reflect the
occurrence of unanticipated events or otherwise. New factors emerge from time to
time, and it is not possible for us to predict which will arise or to assess
with any precision the impact of each factor on our business or the extent to
which any factor, or combination of factors, may cause actual results to differ
materially from those contained in any forward-looking statements.

                                       2






                             ABOUT THIS PROSPECTUS

    This prospectus is part of a registration statement that we filed with the
Securities and Exchange Commission using a 'shelf' registration process. Under
this shelf process, we may sell any combination of the securities described in
this prospectus in one or more offerings up to a total dollar amount of
$500,000,000. This prospectus provides you with a general description of the
securities we may offer. Each time we sell securities, we will provide a
prospectus supplement that will contain specific information about the terms of
that offering. The prospectus supplement may also add, update or change
information contained in this prospectus. You should read both this prospectus
and any prospectus supplement together with the additional information described
under the heading 'Where You May Find Additional Available Information About
Us.'

                                  ABOUT SIRIUS

    From our three orbiting satellites, we directly broadcast more than 100
channels, which we call 'streams', of digital-quality audio throughout the
continental United States for a monthly subscription fee of $12.95. We deliver
60 streams of 100% commercial-free music in virtually every genre, and over 40
streams of news, sports, weather, talk, comedy, public radio and children's
programming. Our broad and deep range of music as well as our news, sports and
entertainment programming is not available on conventional radio in any market
in the United States. We hold one of only two licenses issued by the Federal
Communications Commission to operate a national satellite radio system.


    On September 30, 2003, we had 149,612 subscribers. Our primary source of
revenues is subscription and activation fees. In addition, we derive revenues
from selling limited advertising on our non-music streams.


    We have agreements with Ford Motor Company, DaimlerChrysler Corporation, BMW
of North America, LLC, Nissan North America, Inc. and Volkswagen of America,
Inc. that contemplate the manufacture and sale of vehicles that include SIRIUS
radios. These alliances cover all major brands and affiliates of these
automakers, including Ford, Lincoln, Mercury, Jaguar, Land Rover, Chrysler,
Mercedes, BMW, MINI, Jaguar, Mazda, Dodge, Jeep, Volvo, Nissan, Infiniti,
Volkswagen, Audi and Freightliner and Sterling heavy trucks. None of our
automaker partners are required to manufacture or sell vehicles that include
SIRIUS radios pursuant to these agreements.


    In the autosound aftermarket, SIRIUS radios are available for sale at
various national and regional retailers, such as Best Buy, Circuit City,
Ultimate Electronics, Tweeter Home Entertainment Group, Crutchfield and Good
Guys. On September 30, 2003, SIRIUS radios were available at approximately 5,500
retail locations.


    Sirius Satellite Radio Inc. was incorporated in the State of Delaware on
May 17, 1990. Our executive offices are located at 1221 Avenue of the Americas,
New York, New York 10020, our telephone number is (212) 584-5100 and our
internet address is sirius.com. Sirius.com is an inactive text reference only,
meaning that the information contained on the website is not part of this
prospectus and is not incorporated in this prospectus by reference.

                                       3






                                  RISK FACTORS

    Investing in our securities involves risk, including any risks described in
the accompanying prospectus supplement and in the documents incorporated by
reference in this prospectus, including our Annual Report on Form 10-K for the
year ended December 31, 2002, our Quarterly Reports on Form 10-Q for the
quarters ended March 31, 2003, June 30, 2003 and September 30, 2003, our Current
Reports on Form 8-K dated May 1, 2003, May 14, 2003, May 21, 2003, May 30, 2003,
June 16, 2003, July 30, 2003, August 6, 2003 and October 29, 2003 and in any
filings made with the Securities and Exchange Commission after the date of this
prospectus pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities
Exchange Act. You should carefully consider the risk factors before investing in
our securities.


                  RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS

    The following table sets forth our ratio of earnings to combined fixed
charges and preferred stock dividends for the periods indicated.




                                                                                         FOR THE
                                                                                       NINE MONTHS
                                                YEAR ENDED DECEMBER 31,                   ENDED
                                    -----------------------------------------------   SEPTEMBER 30,
                                     1998      1999      2000      2001      2002          2003
                                     ----      ----      ----      ----      ----          ----
                                                                    
Ratio of earnings to fixed
  charges(1)......................    --        --        --        --        --             --(2)
Ratio of earnings to combined
  fixed charges and preferred
  stock dividends(1)..............    --        --        --        --        --             --(2)(3)



---------



(1)  No figure is provided for any period during which the applicable ratio was
     less than 1.00.

(2)  Includes the effects of other income of $256.5 million associated with our
     March 2003 debt restructuring.

(3)  Includes the effects of a $79.5 million deemed dividend associated with the
     exchange of our preferred stock for common stock and warrants.



    The ratio of earnings to fixed charges is computed by dividing our earnings,
which include income before taxes (excluding the cumulative and transition
effects of accounting changes), fixed charges and amortization of capitalized
interest, by fixed charges. The ratio of earnings to combined fixed charges and
preferred stock dividends is computed by dividing earnings by the sum of fixed
charges and dividends on preferred stock. 'Fixed charges' consist of interest on
debt and a portion of rentals determined to be representative of interest. For
the years ended December 31, 1998, 1999, 2000, 2001 and 2002, and for the nine
months ended September 30, 2003, our earnings were insufficient to cover our
fixed charges by approximately $62.3 million, $119.4 million, $198.5 million,
$255.0 million, $417.6 million and $69.7 million, respectively. Earnings were
also inadequate to cover our combined fixed charges and preferred stock
dividends over the same periods by approximately $99.9 million, $153.5 million,
$247.4 million, $297.2 million, $463.6 million and $157.9 million, respectively.
In connection with our restructuring, most of our debt and all of our
outstanding preferred stock was retired and cancelled in March 2003. In May
2003, we issued $201,250,000 in aggregate principal amount of our 3 1/2%
Convertible Notes due 2008.


                                USE OF PROCEEDS

    Unless otherwise indicated in the applicable prospectus supplement, we will
use the net proceeds from the sale of the offered securities for general
corporate purposes, including capital expenditures, the reduction of
indebtedness and other purposes. We may invest funds not required immediately
for such purposes in short-term obligations or we may use them to reduce the
future level of our indebtedness.

                                       4






                         DESCRIPTION OF DEBT SECURITIES

    The following description of the terms of the debt securities sets forth
certain general terms that may apply to the debt securities. The particular
terms of any debt securities will be described in the prospectus supplement
relating to those debt securities. For purposes of this 'Description of Debt
Securities,' the term 'Sirius' refers to our company but not to any of its
subsidiaries.

    Any senior debt securities will be issued in one or more series under an
indenture, as supplemented or amended from time to time, between us and an
institution that we will name in the related prospectus supplement, as trustee.
Any subordinate debt securities will be issued in one or more series under an
indenture, as supplemented or amended from time to time, between us and an
institution that we will name in the related prospectus supplement, as trustee.
For ease of reference, we will refer to the indenture relating to any senior
debt securities as the senior indenture and to the indenture relating to any
subordinate debt securities as the subordinate indenture.

    This summary of the terms and provisions of the debt securities and the
indentures is not necessarily complete, and we refer you to the copy of the
forms of the indentures which are filed as exhibits to the registration
statement of which this prospectus forms a part. Whenever we refer to particular
defined terms of the indentures in this section or in a prospectus supplement,
we are incorporating these definitions into this prospectus or the prospectus
supplement.

GENERAL

    The debt securities will be issuable in one or more series in accordance
with an indenture supplemental to the applicable indenture or a resolution of
our board of directors or a committee of the board. Unless otherwise specified
in a prospectus supplement, each series of senior debt securities will rank
equally in right of payment with all of our other senior obligations. Each
series of subordinate debt securities will be subordinated and junior in right
of payment to the extent and in the manner described in the subordinate
indenture and any supplemental indenture relating to the subordinate debt
securities. Except as otherwise provided in a prospectus supplement, the
indentures do not limit our ability to incur other secured or unsecured debt,
whether under the indentures, any other indenture that we may enter into in the
future or otherwise. For more information, you should read the prospectus
supplement relating to a particular offering of securities.

    The applicable prospectus supplement will describe the following terms of
the series of debt securities with respect to which this prospectus is being
delivered:

    the title of the debt securities of the series and whether such series
    constitutes senior debt securities or subordinated debt securities;

    any limit on the aggregate principal amount of the debt securities;

    the person to whom any interest on a debt security shall be payable, if
    other than the person in whose name that debt security is registered on the
    regular record date;

    the date or dates on which the principal and premium, if any, of the debt
    securities of the series are payable or the method of that determination or
    the right to defer any interest payments;

    the rate or rates (which may be fixed or variable) at which the debt
    securities will bear interest, if any, or the method of determining the
    rate or rates, the date or dates from which such interest will accrue, the
    interest payment dates on which any such interest will be payable or the
    method by which the dates will be determined, the regular record date for
    any interest payable on any interest payment date and the basis upon which
    interest will be calculated if other than that of a 360-day year of twelve
    30-day months;

    the place or places where the principal of and any premium and any interest
    on the debt securities of the series will be payable, if other than the
    Borough of Manhattan, The City of New York;

                                       5






    the period or periods within which, the date or dates on which, the price or
    prices at which and the terms and conditions upon which the debt securities
    of the series may be redeemed, in whole or in part, at our option or
    otherwise;

    our obligation, if any, to redeem, purchase or repay the debt securities of
    the series pursuant to any sinking fund or analogous provisions or at the
    option of the holders and the period or periods within which, the price or
    prices at which, the currency or currencies including currency unit or units
    in which and the terms and conditions upon which, the debt securities shall
    be redeemed, purchased or repaid, in whole or in part;

    the terms, if any, upon which the debt securities of the series may be
    convertible into or exchanged for other debt securities, preferred stock or
    common stock of Sirius and the terms and conditions upon which the
    conversion or exchange shall be effected, including the initial conversion
    or exchange price or rate, the conversion or exchange period and any other
    additional provisions;

    the denominations in which any debt securities will be issuable, if other
    than denominations of $1,000 and any integral multiple thereof;

    the currency, currencies or currency units in which payment of principal of
    and any premium and interest on debt securities of the series shall be
    payable, if other than United States dollars;

    any index, formula or other method used to determine the amount of payments
    of principal of and any premium and interest on the debt securities;

    if the principal amount payable at the stated maturity of debt securities of
    the series will not be determinable as of any one or more dates before the
    stated maturity, the amount that will be deemed to be the principal amount
    as of any date for any purpose, including the principal amount thereof which
    will be due and payable upon any maturity other than the stated maturity or
    which will be deemed to be outstanding as of any date (or, in any such case,
    the manner in which the deemed principal amount is to be determined), and if
    necessary, the manner of determining the equivalent thereof in United States
    currency;

    if the principal of or any premium or interest on any debt securities is to
    be payable, at our election or the election of the holders, in one or more
    currencies or currency units other than that or those in which such debt
    securities are stated to be payable, the currency, currencies or currency
    units in which payment of the principal of and any premium and interest on
    such debt securities shall be payable, and the periods within which and the
    terms and conditions upon which such election is to be made;

    if other than the principal amount thereof, the portion of the principal
    amount of the debt securities which will be payable upon declaration of the
    acceleration of the maturity thereof or provable in bankruptcy;

    the applicability of, and any addition to or change in, the covenants and
    definitions then set forth in the applicable indenture or in the terms then
    set forth in such indenture relating to permitted consolidations, mergers or
    sales of assets;

    any changes or additions to the provisions of the applicable indenture
    dealing with defeasance, including the addition of additional covenants that
    may be subject to our covenant defeasance option;

    whether any of the debt securities are to be issuable in permanent global
    form and, if so, the depositary or depositaries for such global security and
    the terms and conditions, if any, upon which interests in such debt
    securities in global form may be exchanged, in whole or in part, for the
    individual debt securities represented thereby in definitive registered
    form, and the form of any legend or legends to be borne by the global
    security in addition to or in lieu of the legend referred to in the
    applicable indenture;

    the appointment of any trustee, any authenticating or paying agents,
    transfer agent or registrars;

                                       6






    the terms, if any, of any guarantee of the payment of principal, premium and
    interest with respect to debt securities of the series and any corresponding
    changes to the provisions of the applicable indenture as then in effect;

    the terms, if any, of the transfer, mortgage, pledge or assignment as
    security for the debt securities of the series of any properties, assets,
    moneys, proceeds, securities or other collateral, including whether certain
    provisions of the Trust Indenture Act are applicable and any corresponding
    changes to provisions of the applicable indenture as then in effect;

    any addition to or change in the events of default with respect to the debt
    securities of the series and any change in the right of the trustee or the
    holders to declare the principal, premium and interest with respect to the
    debt securities due and payable;

    any applicable subordination provisions in addition to those set forth
    herein with respect to subordinated debt securities;

    if the securities of the series are to be secured, the property covered by
    the security interest, the priority of the security interest, the method of
    perfecting the security interest and any escrow arrangements related to the
    security interest; and

    any other terms of the debt securities not inconsistent with the provisions
    of the applicable indenture.

    We may sell debt securities at a substantial discount below their stated
principal amount or debt securities that bear no interest or bear interest at a
rate which at the time of issuance is below market rates. We will describe the
material United States federal income tax consequences, accounting and other
special considerations applicable to the debt securities in the applicable
prospectus supplement.

    If the purchase price of any of the debt securities is payable in one or
more foreign currencies or currency units or if any debt securities are
denominated in one or more foreign currencies or currency units or if the
principal of, premium, if any, or interest, if any, on any debt securities is
payable in one or more foreign currencies or currency units, we will set forth
the restrictions, elections, specific terms and other information with respect
to such issue of debt securities and such foreign currency or currency units in
the applicable prospectus supplement.

EXCHANGE, REGISTRATION, TRANSFER AND PAYMENT

    Unless otherwise indicated in the applicable prospectus supplement,
principal, premium, if any, and interest, if any, on the debt securities will be
payable, without coupons, and the exchange of and the transfer of debt
securities will be registrable, at our office or agency maintained for such
purpose in the Borough of Manhattan, The City of New York and at any other
office or agency maintained for such purpose. Unless otherwise indicated in the
applicable prospectus supplement, the debt securities will be issued in
denominations of $1,000 and any integral multiples thereof.

    Holders may present each series of debt securities for exchange as provided
above, and for registration of transfer, with the form of transfer endorsed
thereon, or with a satisfactory written instrument of transfer, duly executed,
at the office of the appropriate securities registrar or at the office of any
transfer agent designated by us for such purpose and referred to in the
applicable prospectus supplement, without service charge and upon payment of any
taxes and other governmental charges as described in the indenture. We will
appoint the trustee of each series of debt securities as securities registrar
for such series under the indenture. If the applicable prospectus supplement
refers to any transfer agents, in addition to the securities registrar initially
designated by us with respect to any series, we may at any time rescind the
designation of any such transfer agent or approve a change in the location
through which any such transfer agent acts, provided that we maintain a transfer
agent in each place of payment for the series. We may at any time designate
additional transfer agents with respect to any series of debt securities.

    All moneys paid by us to a paying agent for the payment of principal,
premium, if any, or interest, if any, on any debt security which remain
unclaimed for two years after such principal,

                                       7






premium or interest has become due and payable may be repaid to us, and after
such time, the holder of such debt security may look only to us for payment.

    In the event of any redemption, we shall not be required to (a) issue,
register the transfer of or exchange debt securities of any series during a
period beginning at the opening of business 15 days before the day of the
mailing of a notice of redemption of debt securities of that series to be
redeemed and ending at the close of business on the day of such mailing or (b)
register the transfer of or exchange any debt security called for redemption,
except, in the case of any debt securities being redeemed in part, any portion
not being redeemed.

BOOK-ENTRY SYSTEM

    The provisions set forth below in this section headed 'Book-Entry System'
will apply to the debt securities of any series if the prospectus supplement
relating to such series so indicates.

    Unless otherwise indicated in the applicable prospectus supplement, the debt
securities of such series will be represented by one or more global securities
registered with a depositary named in the prospectus supplement relating to such
series. Except as set forth below, a global security may be transferred, in
whole but not in part, only to the depositary or another nominee of the
depositary.

    The specific terms of the depositary arrangement with respect to a series of
debt securities will be described in the prospectus supplement relating to the
series. We anticipate that the following provisions will generally apply to
depositary arrangements.

    Upon the issuance of a global security, the depositary will credit, on its
book-entry registration and transfer system, the respective principal amounts of
the debt securities represented by such global security to the accounts of
institutions or persons, commonly known as participants, that have accounts with
the depositary or its nominee. The accounts to be credited will be designated by
the underwriters, dealers or agents. Ownership of beneficial interests in a
global security will be limited to participants or persons that may hold
interests through participants. Ownership of interests in such global security
will be shown on, and the transfer of those ownership interests will be effected
only through, records maintained by the depositary (with respect to
participants' interests) and such participants (with respect to the owners of
beneficial interests in such global security). The laws of some jurisdictions
may require that certain purchasers of securities take physical delivery of the
securities in definitive form. These limits and laws may impair the ability to
transfer beneficial interests in a global security.

    So long as the depositary, or its nominee, is the registered holder and
owner of such global security, the depositary or such nominee, as the case may
be, will be considered the sole owner and holder for all purposes of the debt
securities and for all purposes under the applicable indenture. Except as set
forth below or as otherwise provided in the applicable prospectus supplement,
owners of beneficial interests in a global security will not be entitled to have
the debt securities represented by such global security registered in their
names, will not receive or be entitled to receive physical delivery of debt
securities in definitive form and will not be considered to be the owners or
holders of any debt securities under the applicable indenture or such global
security. Accordingly, each person owning a beneficial interest in a global
security must rely on the procedures of the depositary and, if such person is
not a participant, on the procedures of the participant through which such
person owns its interest, to exercise any rights of a holder of debt securities
under the applicable indenture of such global security. We understand that under
existing industry practice, in the event we request any action of holders of
debt securities or if an owner of a beneficial interest in a global security
desires to take any action that the depositary, as the holder of such global
security is entitled to take, the depositary would authorize the participants to
take such action, and that the participants would authorize beneficial owners
owning through such participants to take such actions or would otherwise act
upon the instructions of beneficial owners owning through them.


    Payments of principal, premium, if any, and interest, if any, on debt
securities represented by a global security will be made to the depositary or
its nominee, as the case may


                                       8






be, as the registered owner and holder of such global security, against
surrender of the debt securities at the principal corporate trust office of the
trustee. Interest payments will be made at the principal corporate trust office
of the trustee or by a check mailed to the holder at its registered address.
Payment in any other manner will be specified in the prospectus supplement.

    We expect that the depositary, upon receipt of any payment of principal,
premium, if any, of interest, if any, in respect of a global security, will
credit immediately participants' accounts with payments in amounts proportionate
to their respective beneficial interests in the principal amount of such global
security as shown on the records of the depositary. We expect that payments by
participants to owners of beneficial interests in a global security held through
such participants will be governed by standing instructions and customary
practices, as is now the case with securities held for the accounts of customers
in bearer form or registered in 'street name,' and will be the responsibility of
such participant. Neither Sirius nor the trustee nor any agent of Sirius or the
trustee will have any responsibility or liability for any aspect of the records
relating to, or payments made on account of, beneficial ownership interests in a
global security or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests or for any other aspect of the
relationship between the depositary and its participants or the relationship
between such participants and the owners of beneficial interests in such global
security owning through such participants.

    Unless and until it is exchanged in whole or in part for debt securities in
definitive form, a global security may not be transferred except as a whole by
the depositary to a nominee of such depositary or by a nominee of such
depositary to such depositary or another nominee of such depositary.

    Unless otherwise provided in the applicable prospectus supplement, debt
securities represented by a global security will be exchangeable for debt
securities in definitive form of like tenor as such global security in
denominations of $1,000 and in any greater amount that is an integral multiple
thereof if:

    the depositary notifies us and the trustee that it is unwilling or unable to
    continue as depositary for such global security or if at any time the
    depositary ceases to be a clearing agency registered under the Exchange Act
    and a successor depositary is not appointed by us within 90 days;

    we, in our sole discretion, determine not to have all of the debt securities
    represented by a global security and notify the trustee thereof; or

    there shall have occurred and be continuing an event of default or an event
    which, with the giving of notice or lapse of time, or both, would constitute
    an event of default with respect to the debt securities.

Any debt security that is exchangeable pursuant to the preceding sentence is
exchangeable for debt securities registered in such names as the depositary
shall instruct the trustee. It is expected that such instructions may be based
upon directions received by the depositary from its participants with respect to
ownership of beneficial interests in such global security. Subject to the
foregoing, a global security is not exchangeable except for a global security or
global securities of the same aggregate denominations to be registered in the
name of the depositary or its nominee.

OPTION TO DEFER INTEREST PAYMENTS OR TO PAY-IN-KIND

    If so described in the applicable prospectus supplement, we will have the
right, at any time and from time to time during the term of any series of debt
securities, to defer the payment of interest for such number of consecutive
interest payment periods as may be specified in the applicable prospectus
supplement, subject to the terms, conditions and covenants, if any, specified in
such prospectus supplement, provided that an extension period may not extend
beyond the stated maturity of the final installment of principal of the series
of debt securities. If provided in the applicable prospectus supplement, we will
have the right, at any time and from time to time during the term of any series
of debt securities, to make payments of interest by delivering additional debt
securities of the same series.

                                       9






COVENANTS

    The covenants, if any, that will apply to a particular series of debt
securities will be set forth in the indenture relating to such series of debt
securities. Except as otherwise specified in the applicable prospectus
supplement with respect to any series of debt securities, we may remove or add
covenants without the consent of holders of the securities.

DEFEASANCE AND COVENANT DEFEASANCE

    We may be discharged from our obligations on the debt securities of any
series that have matured or will mature or be redeemed within one year if we
deposit with the trustee enough cash to pay all the principal, interest and any
premium due to the stated maturity date or redemption date of the debt
securities and comply with certain other conditions set forth in the applicable
indenture.

    Each indenture contains a provision that permits us to elect either:

    to be discharged after 90 days from all of our obligations (subject to
    limited exceptions) with respect to any series of debt securities then
    outstanding ('defeasance'); and/or

    to be released from our obligations under certain covenants and from the
    consequences of an event of default resulting from a breach of those
    covenants or cross-default ('covenant defeasance').

To make either of the above elections, we must deposit in trust with the trustee
money and/or U.S. Government Obligations, if the debt securities are denominated
in U.S. dollars, and/or Foreign Government Securities, if the debt securities
are denominated in a foreign currency, which through the payment of principal
and interest under their terms will provide sufficient money, without
reinvestment, to repay in full those senior or subordinate debt securities. As a
condition to defeasance or covenant defeasance, we must deliver to the trustee
an opinion of counsel that the holders of the debt securities will not recognize
income, gain or loss for federal income tax purposes as a result of the
defeasance.

    If either of the above events occur, the holders of the debt securities of
the series will not be entitled to the benefits of the indenture, except for
registration of transfer and exchange of debt securities and replacement of
lost, stolen or mutilated debt securities.

EVENTS OF DEFAULT

    The following events are defined in the indentures as 'Events of Default'
with respect to a series of debt securities (unless such event is specifically
inapplicable to a particular series as described in the applicable prospectus
supplement):

    failure to pay any interest on any debt security of that series when due,
    which failure continues for 30 days;

    failure to pay principal of or any premium on any debt security of that
    series when due;

    failure to deposit any sinking fund payment, within 30 days of when due, in
    respect of any debt security of that series;

    with respect to each series of debt securities, failure to perform any other
    of our covenants applicable to that series, which failure continues for 90
    days after written notice to us by the trustee or to us and the trustee by
    the holders of at least 25% in principal amount of the outstanding debt
    securities of that series specifying such failure, requiring it to be
    remedied and stating that such notice is a 'Notice of Default';

    certain events of bankruptcy, insolvency or reorganization involving us; and

    any other Event of Default provided with respect to debt securities of that
    series.

    If an Event of Default for any series of debt securities occurs and
continues, the trustee or holders of at least 25% in principal amount of the
debt securities of that series may declare the entire principal amount of all
the debt securities of that series to be due and payable immediately.

                                       10






Subject to certain conditions, the declaration may be annulled and past defaults
(except uncured payment defaults and certain other specified defaults) may be
waived by the holders of a majority of the principal amount of the outstanding
debt securities of that series.

    An Event of Default for a particular series of debt securities does not
necessarily constitute an event of default for any other series of debt
securities issued under an indenture.

    Each indenture will require the trustee, within 90 days after the occurrence
of a default known to it with respect to any outstanding series of debt
securities, to give the holders of that series notice of the default if uncured
or not waived. However, the trustee may withhold this notice if it determines in
good faith that the withholding of this notice is in the interest of those
holders, except that the trustee may not withhold this notice in the case of a
payment default. The term 'default' for the purpose of this provision means any
event that is, or after notice or lapse of time or both would become, an Event
of Default with respect to debt securities of that series.

    Other than the duty to act with the required standard of care during an
Event of Default, a trustee is not obligated to exercise any of its rights or
powers under the applicable indenture at the request or direction of any of the
holders of debt securities, unless the holders have offered to the trustee
reasonable indemnification. Each indenture provides that the holders of a
majority in principal amount of outstanding debt securities of any series may in
certain circumstances direct the time, method and place of conducting any
proceeding for any remedy available to the trustee, or exercising any trust or
other power conferred on the trustee.

    The senior indenture will include a covenant that we will file annually with
the trustee a certificate of no default, or specifying any default that exists.

MODIFICATION, WAIVER AND MEETINGS

    We and the trustee may enter into supplemental indentures without the
consent of the holders of debt securities for one or more of the following
purposes:

    to evidence the succession of another person to us pursuant to the
    provisions of the applicable indenture relating to consolidations, mergers
    and sales of assets and the assumption by the successor of our covenants,
    agreements and obligations in the applicable indenture and in the debt
    securities;

    to surrender any right or power conferred upon us by the applicable
    indenture, to add to our covenants such further covenants, restrictions,
    conditions or provisions for the protection of the holders of all or any
    series of debt securities as our board of directors shall consider to be for
    the protection of the holders of the debt securities, and to make the
    occurrence, or the occurrence and continuance, of a default in any of the
    additional covenants, restrictions, conditions or provisions a default or an
    Event of Default under the applicable indenture (provided, however, that
    with respect to any such additional covenant, restriction, condition or
    provision, the supplemental indenture may provide for a period of grace
    after default, which may be shorter or longer than that allowed in the case
    of other defaults, may provide for an immediate enforcement upon the
    default, may limit the remedies available to the trustee upon the default,
    or may limit the right of holders of a majority in aggregate principal
    amount of any or all series of debt securities to waive the default);

    to cure any ambiguity or omission or to correct or supplement any provision
    contained in the applicable indenture, in any supplemental indenture or in
    any debt securities that may be defective or inconsistent with any other
    provision contained therein, to convey, transfer, assign, mortgage or pledge
    any property to or with the trustee, or to make such other provisions in
    regard to matters or questions arising under the applicable indenture, in
    each case as shall not adversely affect the interests of any holders of debt
    securities of any series in any material respect;

    to modify or amend the applicable indenture to permit the qualification of
    such indenture or any supplemental indenture under the Trust Indenture Act
    as then in effect;

                                       11






    to add guarantees with respect to any or all of the debt securities or to
    secure any or all of the debt securities;

    to add to, change or eliminate any of the provisions of the applicable
    indenture with respect to one or more series of debt securities; so long as
    any such addition, change or elimination not otherwise permitted under the
    applicable indenture shall (1) neither apply to any debt security of any
    series created before the execution of the supplemental indenture and
    entitled to the benefit of the provision nor modify the rights of the
    holders of any debt security with respect to the provision, or (2) become
    effective only when there is no such debt security outstanding;

    to evidence and provide for the acceptance of appointment by a successor or
    separate trustee with respect to the debt securities of one or more series
    and to add to or change any of the provisions of the applicable indenture as
    shall be necessary to provide for or facilitate the administration of such
    indenture by more than one trustee;

    to establish the form or terms of debt securities of any series;

    to provide for uncertificated debt securities in addition to or in place of
    certificated debt securities (provided that the uncertificated debt
    securities are issued in registered form for purposes of Section 163(f) of
    the Internal Revenue Code or in a manner such that the uncertificated debt
    securities are described in Section 163(f)(2)(B) of such Code); and

    to make any change that does not adversely affect the rights of any holder.

    Modifications and amendments of the applicable indenture may be made by us
and the trustee with the consent of the holders of a majority in principal
amount of the outstanding debt securities of each series affected by such
modification or amendment; provided, however, that no such modification or
amendment may, without the consent of the holder of each outstanding debt
security affected thereby:

    change the stated maturity of the principal of, or any installment of
    principal of or interest on, any debt security;

    reduce the principal amount of, rate of interest on or any premium payable
    upon the redemption of any debt security;

    reduce the amount of principal of an original issue discount security
    payable upon acceleration of the maturity thereof;

    change the place of payment where, or the coin or currency in which, any
    debt security or any premium or interest thereon is payable;

    impair the right to institute suit for the enforcement of any payment on or
    with respect to any debt security after the stated maturity, redemption date
    or repayment date;

    reduce the percentage in principal amount of outstanding debt securities of
    any series, the consent of whose holders is required for modification or
    amendment of the applicable indenture or for waiver of compliance with
    certain provisions of such indenture or for waiver of certain defaults;

    change the optional redemption or repurchase provisions in a manner adverse
    to any holder; or

    modify any of the provisions set forth in this paragraph, except to increase
    the percentage of holders whose consent is required for modifications and
    amendments of the applicable indenture or to provide that certain other
    provisions of the applicable indenture may not be modified or waived without
    the consent of the holder of each outstanding debt security affected
    thereby.

    The holders of a majority in principal amount of the outstanding debt
securities of each series may, on behalf of the holders of all the debt
securities of that series, waive, insofar as that series is concerned,
compliance by us with certain restrictive provisions of the applicable
indenture. The holders of a majority in principal amount of the outstanding debt
securities of each series may, on behalf of all holders of debt securities of
that series and any coupons relating to such series, waive

                                       12






any past default under the applicable indenture with respect to debt securities
of the series, except a default (a) in the payment of principal of or any
premium or interest on any debt security of such series or (b) in respect of a
covenant or provision of the applicable indenture which cannot be modified or
amended without the consent of each holder of outstanding debt securities of the
affected series.

    The indentures provide that in determining whether the holders of the
requisite principal amount of the outstanding debt securities have given any
request, demand, authorization, direction, notice, consent or waiver thereunder
or whether a quorum is present at a meeting of holders of debt securities:

    the principal amount of an original issue discount security that shall be
    deemed to be outstanding shall be the amount of the principal thereof that
    would be due and payable as of the date of such determination upon
    acceleration of the maturity thereof;

    the principal amount of a debt security denominated in other than U.S.
    dollars shall be the U.S. dollar equivalent, determined on the date of
    original issuance of such debt security, of the principal amount of such
    debt security (or, in the case of an original issue discount security, the
    U.S. dollar equivalent on the date of original issuance of such debt
    security of the amount determined (as provided above) of such debt
    security); and

    debt securities owned by us or any subsidiary of ours shall be disregarded
    and deemed not to be outstanding.

    In addition, we and the trustees may execute, without the consent of any
holder of the debt securities, any supplemental indenture for the purpose of
creating any new series of debt securities.

SUBORDINATION

    Except as set forth in the applicable prospectus supplement, the subordinate
indenture provides that the subordinate debt securities are subordinate and
junior in right of payment to all of our senior indebtedness.

    If an Event of Default occurs with respect to any senior indebtedness
permitting the holders thereof to accelerate the maturity thereof and the
default is the subject of judicial proceedings or written notice of such Event
of Default, requesting that payments on subordinate debt securities cease, is
given to us by the holders of senior indebtedness, then unless and until
(1) the default in payment or Event of Default shall have been cured or waived
or (2) 120 days shall have passed after written notice is given and the default
is not the subject of judicial proceedings, no direct or indirect payment, in
cash, property or securities, by set-off or otherwise, will be made or agreed to
be made on account of the subordinate debt securities or interest thereon or in
respect of any repayment, redemption, retirement, purchase or other acquisition
of subordinate debt securities.

    Except as set forth in the applicable prospectus supplement, the subordinate
indenture provides that in the event of:

    any insolvency, bankruptcy, receivership, reorganization or other similar
    proceeding relating to us, our creditors or our property; or

    any proceeding for the liquidation or dissolution of Sirius,

all present and future senior indebtedness, including interest accruing after
the commencement of the proceeding, will first be paid in full before any
payment or distribution, whether in cash, securities or other property, will be
made by us on account of subordinate debt securities. In that event, any payment
or distribution, whether in cash, securities or other property, other than
securities of Sirius or any other corporation provided for by a plan of
reorganization or a readjustment, the payment of which is subordinate, at least
to the extent provided in the subordination provisions of the indenture, to the
payment of all senior indebtedness at the time outstanding and to any securities
issued in respect thereof under any such plan of reorganization or readjustment
and other than payments made from any trust described in the 'Defeasance and
Covenant Defeasance' above, which would otherwise but for the subordination
provisions be payable or deliverable in respect of subordinate debt securities,
including any such payment or

                                       13






distribution which may be payable or deliverable by reason of the payment of any
other indebtedness of ours being subordinate to the payment of subordinated debt
securities, will be paid or delivered directly to the holders of senior
indebtedness or to their representative or trustee, in accordance with the
priorities then existing among such holders, until all senior indebtedness shall
have been paid in full. No present or future holder of any senior indebtedness
will be prejudiced in the right to enforce subordination of the indebtedness
evidenced by subordinate debt securities by any act or failure to act on our
part.

    The term 'Senior Indebtedness' means:

        (1) the principal, premium, if any, interest and all other amounts owed
    in respect of all our (A) indebtedness for money borrowed and (B)
    indebtedness evidenced by securities, debentures, bonds or other similar
    instruments;

        (2) all our capital lease obligations;

        (3) all our obligations issued or assumed as the deferred purchase price
    of property, all our conditional sale obligations and all our obligations
    under any title retention agreement (but excluding trade accounts payable
    arising in the ordinary course of business);

        (4) all our obligations for the reimbursement of any letter of credit,
    banker's acceptance, security purchase facility or similar credit
    transaction;

        (5) all obligations of the type referred to in clauses (1) through (4)
    above of other persons for the payment of which we are responsible or liable
    as obligor, guarantor or otherwise; and

        (6) all obligations of the type referred to in clauses (1) through (5)
    above of other persons secured by any lien on any property or asset of ours
    (whether or not such obligation is assumed by us),

        except for in all such cases (x) any such indebtedness that is by its
    terms subordinated to or pari passu with the subordinate debt securities and
    (y) any indebtedness between or among us or our affiliates, including all
    other debt securities and guarantees in respect of those debt securities
    issued to any trust, or trustee of such trust, partnership or other entity
    affiliated with us that is, directly or indirectly, a financing vehicle of
    ours (a 'Financing Entity') in connection with the issuance by such
    Financing Entity of preferred securities or other securities that rank pari
    passu with, or junior to, the subordinate debt securities.

    Except as provided in the applicable prospectus supplement, the subordinate
indenture for a series of subordinated debt does not limit the aggregate amount
of senior indebtedness that may be issued by us. The subordinate debt securities
are effectively subordinated to all existing and future liabilities of our
subsidiaries.

    By reason of such subordination, in the event of a distribution of assets
upon insolvency, some of our general creditors may recover more, ratably, than
holders of the subordinated debt securities.

    A subordinate indenture may provide that the subordination provisions
thereof will not apply to money and securities held in trust pursuant to the
satisfaction and discharge and the legal defeasance provisions of the
subordinate indenture.

    If this prospectus is being delivered in connection with the offering of a
series of subordinated debt securities, the accompanying prospectus supplement
or the information incorporated by reference therein will set forth the
approximate amount of senior indebtedness outstanding as of a recent date.

CONSOLIDATION, MERGER AND SALE OF ASSETS

    Except as may otherwise be provided in the prospectus supplement, each
indenture provides that we may not consolidate with or merge with or into any
person, or convey, transfer or lease

                                       14






all or substantially all of our assets, or permit any person to consolidate with
or merge into us, unless the following conditions have been satisfied:

    (a) either (1) we shall be the continuing person in the case of a merger or
        (2) the resulting, surviving or transferee person, if other than us (the
        'Successor Company'), shall be a corporation organized and existing
        under the laws of the United States, any State or the District of
        Columbia and shall expressly assume all our obligations under the debt
        securities and the applicable indenture;

    (b) immediately after giving effect to the transaction (and treating any
        indebtedness that becomes an obligation of the Successor Company or any
        subsidiary of ours as a result of the transaction as having been
        incurred by the Successor Company or the subsidiary at the time of the
        transaction), no default, Event of Default or event that, after notice
        or lapse of time, would become an Event of Default under the applicable
        indenture shall have occurred and be continuing; and

    (c) we shall have delivered to the trustee under each indenture an officers'
        certificate and an opinion of counsel, each stating that the
        consolidation, merger, transfer or lease complies with the provisions of
        the applicable indenture.

    Upon completion of any such transaction, the Successor Company resulting
from such consolidation or into which we are merged or the transferee or lessee
to which such conveyance, transfer or lease is made, will succeed to, and be
substituted for, and may exercise every right and power of, us under each
indenture, and thereafter, except in the case of a lease, the predecessor (if
still in existence) will be released from its obligations and covenants under
each indenture and all outstanding debt securities.

NOTICES

    Except as otherwise provided in the indentures, notices to holders of debt
securities will be given by mail to the addresses of such holders as they appear
in the Security Register.

CONVERSION OR EXCHANGE

    If and to the extent indicated in the applicable prospectus supplement, the
debt securities of any series may be convertible or exchangeable into other
securities. The specific terms on which debt securities of any series may be so
converted or exchanged will be set forth in the applicable prospectus
supplement. These terms may include provisions for conversion or exchange,
either mandatory, at the option of the holder, or at our option, in which case
the number of shares of other securities to be received by the holders of debt
securities would be calculated as of a time and in the manner stated in the
applicable prospectus supplement.

TITLE

    Before due presentment of a debt security for registration of transfer, we,
the trustee and any agent of ours or the trustee may treat the person in whose
name such debt security is registered as the owner of such debt security for the
purpose of receiving payment of principal of and any premium and any interest
(other than defaulted interest or as otherwise provided in the applicable
prospectus supplement) on such debt security and for all other purposes
whatsoever, whether or not such debt security be overdue, and neither Sirius,
the trustee nor any agent of ours or the trustee shall be affected by notice to
the contrary.

REPLACEMENT OF DEBT SECURITIES

    Any mutilated debt security will be replaced by us at the expense of the
holder upon surrender of such debt security to the trustee. Debt securities that
become destroyed, stolen or lost will be replaced by us at the expense of the
holder upon delivery to the trustee of the debt security or evidence of the
destruction, loss or theft thereof satisfactory to us and the trustee. In the
case of a destroyed, lost or stolen debt security, an indemnity satisfactory to
the trustee and us may be required at the expense of the holder of such debt
security before a replacement debt security will be issued.

                                       15






GOVERNING LAW

    The indentures and the debt securities will be governed by, and construed in
accordance with, the laws of the State of New York.

REGARDING THE TRUSTEE

    We may appoint a separate trustee for any series of debt securities. As used
herein in the description of a series of debt securities, the term 'trustee'
refers to the trustee appointed with respect to the series of debt securities.

    The indentures contain certain limitations on the right of the trustee,
should it become a creditor of ours, to obtain payment of claims in certain
cases or to realize for its own account on certain property received in respect
of any such claim as security or otherwise. The trustee will be permitted to
engage in certain other transactions; however, if it acquires any conflicting
interest and there is a default under the debt securities of any series for
which the trustee serves as trustee, the trustee must eliminate such conflict or
resign.

    The trustee or its affiliate may provide certain banking and financial
services to us in the ordinary course of business.

                                       16





                          DESCRIPTION OF CAPITAL STOCK

    Our amended and restated certificate of incorporation provides for
authorized capital of 2,550,000,000 shares, consisting of 2,500,000,000 shares
of common stock, par value $0.001 per share, and 50,000,000 shares of preferred
stock, par value $0.001 per share.

    The following description sets forth the terms and provisions of our common
stock and preferred stock. The terms of any shares of our capital stock offered
by any prospectus supplement, but not set forth below, will be described in the
prospectus supplement relating to such shares of capital stock.

COMMON STOCK


    As of September 30, 2003, we had 998,205,643 shares of common stock
outstanding beneficially held by approximately 220,000 persons, and had reserved
for issuance 433,519,831 shares of common stock with respect to incentive stock
plans and outstanding common stock purchase warrants.


    Holders of our common stock are entitled to cast one vote for each share
held of record on all matters acted upon at any stockholder's meeting and to
receive dividends if, as and when declared by our board of directors out of
funds legally available therefor. There are no cumulative voting rights. If
there is any liquidation, dissolution or winding-up of our company, each holder
of our common stock will be entitled to participate, taking into account the
rights of any outstanding preferred stock, ratably in all of our assets
remaining after payment of liabilities. Holders of our common stock have no
preemptive or conversion rights. All outstanding shares of our common stock,
including shares of common stock issued upon the exercise of the common stock
warrants, will be fully paid and non-assessable.

    Our common stock is quoted on the Nasdaq National Market under the symbol
'SIRI.'

PREFERRED STOCK

    Our board of directors is authorized, subject to any limitations prescribed
by law, without further stockholder approval, to issue from time to time up to
an aggregate of 50,000,000 shares of our preferred stock, in one or more series.
Each such series of preferred stock will have such number of shares,
designations, preferences, powers, qualifications and special or relative rights
or privileges as will be determined by our board of directors, which may
include, among others, dividend rights, voting rights, redemption and sinking
fund provisions, liquidation preferences, conversion rights and preemptive
rights. The rights of the holders of our common stock will be subject to the
rights of holders of any preferred stock issued in the future. The issuance of
preferred stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could have the effect of
making it more difficult for a third party to acquire, or of discouraging a
third party from acquiring, a majority of our outstanding voting stock.

    In connection with our recent restructuring, all of our then outstanding
preferred stock was retired and cancelled as of March 7, 2003.

    The specific terms of any preferred stock being offered will be described in
the prospectus supplement relating to that preferred stock. The following
summaries of the provisions of the preferred stock are subject to, and are
qualified in their entirety by reference to, the certificate of designation
relating to the particular class or series of preferred stock. Reference is made
to the prospectus supplement relating to the preferred stock offered with that
prospectus for specific terms, including:

    the designation of the preferred stock;

    the number of shares of the preferred stock offered, the liquidation
    preference per share and the initial offering price of the preferred stock;

                                       17






    the dividend rate(s), period(s) and/or payment date(s) or method(s) of
    calculating these items applicable to the preferred stock;

    the date from which dividends on the preferred stock will accumulate, if
    applicable;

    the procedures for any auction and remarketing of the preferred stock;

    the provision of a sinking fund, if any, for the preferred stock;

    the provision for redemption, if applicable, of the preferred stock;

    any listing of the preferred stock on any securities exchange;

    the terms and conditions, if applicable, upon which the preferred stock will
    be convertible into or exchangeable for common stock, and whether at our
    option or the option of the holder;

    whether the preferred stock will rank senior or junior to or on a parity
    with any other class or series of preferred stock;

    the voting rights, if any, of the preferred stock;

    any other specific terms, preference, rights, limitations or restrictions of
    the preferred stock; and

    a discussion of United States federal income tax considerations applicable
    to the preferred stock.

PREFERRED STOCK PURCHASE RIGHTS

    On October 22, 1997, our board of directors adopted a stockholders rights
plan and, in connection with the adoption of this plan, declared a dividend
distribution of one 'Right' for each outstanding share of common stock to
stockholders of record at the close of business on November 3, 1997 (the 'Rights
Record Date'). Except as described below, each Right entitles the registered
holder of the Right to purchase from us one-hundredth of a share of Series B
Preferred Stock, par value $0.001 per share (the 'Series B Shares'), at a
purchase price of $115.00 (the 'Purchase Price'), which may be adjusted. The
Purchase Price shall be paid in cash. The description and terms of the Rights
are set forth in a Rights Agreement, dated October 22, 1997 (the 'Rights
Agreement'), by and between us and The Bank of New York (the successor to
Continental Stock Transfer & Trust Company), as Rights Agent, and in amendments
to the Rights Agreement dated October 13, 1998, November 13, 1998, December 22,
1998, June 11, 1999, September 29, 1999, December 23, 1999, January 28, 2000,
August 7, 2000, January 8, 2002, October 22, 2002, March 6, 2003, April 30, 2003
and July 30, 2003.

    Initially, no separate Right certificates were distributed and the Rights
were evidenced, with respect to any shares of common stock outstanding on the
Rights Record Date, by the certificates representing the shares of common stock.
Until the Rights Separation Date (as defined below), the Rights will be
transferred with, and only with, certificates for shares of common stock. Until
the earlier of the Rights Separation Date and the redemption or expiration of
the Rights, new certificates for shares of common stock issued after the Rights
Record Date will contain a notation incorporating the Rights Agreement by
reference. The Rights are not exercisable until the earlier to occur of (1) 10
business days following a public announcement that a person or group of
affiliated or associated persons (an 'Acquiring Person') has acquired, or
obtained the right to acquire, beneficial ownership of 15% or more of the
outstanding shares of common stock (except by reason of (a) exercise by this
person of stock options granted to this person by us under any of our stock
option or similar plans (b) the exercise of conversion rights contained in
specified classes of Preferred Stock, or (c) the exercise of warrants owned on
the date of the Rights Agreement, which include warrants to acquire 1,740,000
shares of common stock issued to an affiliate of Everest Capital Fund, Ltd. or
(2) 15 business days following the commencement of a tender offer or exchange
offer by any person (other than Sirius, any subsidiary of Sirius or any employee
benefit plan of Sirius) if, upon the completion of this tender offer or exchange
offer, this person or group would be the beneficial owner of 15% or more of the
outstanding shares of

                                       18






common stock (the earlier of these dates being called the 'Rights Separation
Date'), and will expire on January 15, 2004, unless earlier extended or redeemed
by us as described below. As soon as practicable following the Rights Separation
Date, separate certificates evidencing the Rights will be mailed to holders of
record of the shares of common stock as of the close of business on the Rights
Separation Date and, thereafter, the separate Rights certificates alone will
evidence the Rights. A holder of 15% or more of the common stock as of the date
of the Rights Agreement will be excluded from the definition of 'Acquiring
Person' unless the holder increases the aggregate percentage of its and its
affiliates' beneficial ownership interest in us by an additional 1%.

    On March 6, 2003, we amended the Rights Agreement to (1) render the Rights
Agreement inapplicable to the issuance of common stock to Lehman Commercial
Paper Inc. in the restructuring transactions and to permit Lehman to acquire up
to an additional 1% of the outstanding shares of common stock, without Lehman
becoming an 'Acquiring Person' within the meaning of the Rights Agreement and
(2) permit each of OppenheimerFunds, Inc., Apollo Management, L.P., The
Blackstone Group L.P. and their respective affiliates and affiliated investment
funds to acquire up to 25% of the outstanding shares of common stock, without
becoming 'Acquiring Persons' within the meaning of the Rights Agreement.

    If, at any time following the Rights Separation Date, (1) we are the
surviving corporation in a merger with an Acquiring Person and our shares of
common stock are not changed or exchanged, (2) a person (other than Sirius, any
subsidiary of Sirius or any employee benefit plan of Sirius), together with its
Affiliates and Associates (as defined in the Rights Agreement), becomes an
Acquiring Person (in any manner, except by (a) the exercise of stock options
granted under our existing and future stock option plans, (b) the exercise of
conversion rights contained in specified preferred stock issues, (c) the
exercise of warrants specified in the Rights Agreement or (d) a tender offer for
any and all outstanding shares of common stock made as provided by applicable
laws, which remains open for at least 40 Business Days (as defined in the Rights
Agreement) and into which holders of 80% or more of our outstanding shares of
common stock tender their shares), (3) an Acquiring Person engages in one or
more 'self-dealing' transactions as described in the Rights Agreement or
(4) during the time when there is an Acquiring Person, an event occurs (e.g., a
reverse stock split), that results in the Acquiring Person's ownership interest
being increased by more than one percent, the Rights Agreement provides that
proper provision shall be made so that each holder of a Right will thereafter be
entitled to receive, upon the exercise of the Right at the then current exercise
price of the Right, shares of common stock (or, in some circumstances, cash,
property or other securities of ours) having a value equal to two times the
exercise price of the Right.

    If, at any time following the first date of public announcement by us or an
Acquiring Person indicating that this Acquiring Person has become an Acquiring
Person (the 'Shares Acquisition Date'), (1) we consolidate or merge with another
person and we are not the surviving corporation, (2) we consolidate or merge
with another person and are the surviving corporation, but in the transaction
our shares of common stock are changed or exchanged or (3) 50% or more of our
assets or earning power is sold or transferred, the Rights Agreement provides
that proper provision shall be made so that each holder of a Right shall
thereafter have the right to receive, upon the exercise of the Right at the then
current exercise price of the Right, shares of common stock of the acquiring
company having a value equal to two times the exercise price of the Right.

    Our board of directors may, at its option, at any time after the right of
the board to redeem the Rights has expired or terminated (with some exceptions),
exchange all or part of the then outstanding and exercisable Rights (other than
those held by the Acquiring Person and Affiliates and Associates of the
Acquiring Person) for shares of common stock at a ratio of one share of common
stock per Right, as adjusted; provided, however, that the Right cannot be
exercised once a person, together with the person's Affiliates and Associates,
becomes the beneficial owner of 50% or more of the shares of common stock then
outstanding. If our board of directors authorizes this exchange, the Rights will
immediately cease to be exercisable.

                                       19






    Notwithstanding any of the foregoing, following the occurrence of any of the
events described in the fourth and fifth paragraphs of this section, any Rights
that are, or (under some circumstances specified in the Rights Agreement) were,
beneficially owned by any Acquiring Person or Affiliate or Associate of an
Acquiring Person shall immediately become null and void. The Rights Agreement
contains provisions intended to prevent the utilization of voting trusts or
similar arrangements that could have the effect of rendering ineffective or
circumventing the beneficial ownership rules described in the Rights Agreement.

    The Purchase Price payable, and the number of Series B Shares or other
securities or property issuable, upon exercise of the Rights may be adjusted
from time to time to prevent dilution (1) in the event of a dividend of
Series B Shares on, or a subdivision, combination or reclassification of, the
Series B Shares, (2) upon the grant to holders of the Series B Shares of
specific rights or warrants to subscribe for Series B Shares or securities
convertible into Series B Shares at less than the current market price of the
Series B Shares or (3) upon the distribution to holders of the Series B Shares
of debt securities or assets (excluding regular quarterly cash dividends and
dividends payable in Series B Shares) or of subscription rights or warrants
(other than those referred to above).

    At any time after the date of the Rights Agreement until ten Business Days
(a period that can be extended) following the Shares Acquisition Date, the board
of directors, with the concurrence of a majority of the independent directors
(those members of our board who are not officers or employees of ours or of any
subsidiary of ours and who are not Acquiring Persons or their Affiliates,
Associates, nominees or representatives, and who either (1) were members of the
board before the adoption of the Rights Plan or (2) were subsequently elected to
our board and were recommended for election or approved by a majority of the
independent directors then on our board), may redeem the Rights, in whole but
not in part, at a price of $0.01 per Right, which may be adjusted. Thereafter,
our board of directors may redeem the Rights only in specified circumstances
including in connection with specific events not involving an Acquiring Person
or an Affiliate or Associate of an Acquiring Person. In addition, our right of
redemption may be reinstated if (1) an Acquiring Person reduces its beneficial
ownership to 10% or less of the outstanding shares of common stock in a
transaction or series of transactions not involving us and (2) there is at the
time no other Acquiring Person. The Rights Agreement may also be amended, as
described below, to extend the period of redemption.

    Until a Right is exercised, the holder of the Right, as such, will have no
rights as a stockholder, including the right to vote or to receive dividends.
While the distribution of the Rights will not be taxable to stockholders or to
us, stockholders may, depending upon the circumstances, recognize taxable income
if the Rights become exercisable for shares of our common stock (or other
consideration) or for shares of common stock of the Acquiring Person.

    Other than those provisions relating to the principal economic terms of the
Rights or imposing limitations on the right to amend the Rights Agreement, any
of the provisions of the Rights Agreement may be amended by our board of
directors with the concurrence of a majority of the independent directors or by
special approval of our stockholders before the Rights Separation Date.
Thereafter, the period during which the Rights may be redeemed may be extended
(by action of our board of directors, with the concurrence of a majority of the
independent directors or by special approval of our stockholders), and other
provisions of the Rights Agreement may be amended by action of our board of
directors with the concurrence of a majority of the independent directors or by
special approval of our stockholders; provided, however, that (a) this amendment
will not adversely affect the interests of holders of Rights (excluding the
interests of any Acquiring Person) and (b) no amendment shall be made at a time
when the Rights are no longer redeemable (except for the possibility of the
right of redemption being reinstated as described above).

DELAWARE ANTI-TAKEOVER LAW AND PROVISIONS IN OUR CHARTER

    Section 203 of the Delaware General Corporation Law ('Section 203')
generally provides that a stockholder acquiring more than 15% of the outstanding
voting stock of a corporation subject to

                                       20






the statute (an 'Interested Stockholder') but less than 85% of this stock may
not engage in some types of Business Combinations (as defined in Section 203)
with the corporation for a period of three years after the time the stockholder
became an Interested Stockholder. The prohibition of Section 203 does not apply
under the following circumstances:

    before the time of the acquisition, the corporation's board of directors
    approved either the Business Combination or the transaction in which the
    stockholder became an Interested Stockholder; or

    the Business Combination is approved by the corporation's board of directors
    and authorized at a stockholders' meeting by a vote of at least two-thirds
    of the corporation's outstanding voting stock not owned by the Interested
    Stockholder.

    Under Section 203, these restrictions will not apply to specific Business
Combinations proposed by an Interested Stockholder following the earlier of the
announcement or notification of specific extraordinary transactions involving
the corporation and a person who was not an Interested Stockholder during the
previous three years, who became an Interested Stockholder with the approval of
the corporation's board of directors or who became an Interested Stockholder at
a time when the restrictions contained in Section 203 did not apply for reasons
specified in Section 203. The above exception applies if the extraordinary
transaction is approved or not opposed by a majority of the directors who were
directors prior to the person becoming an Interested Stockholder during the
previous three years or were recommended for election or elected to succeed
those directors by a majority of those directors.

    Section 203 defines the term 'Business Combination' to encompass a wide
variety of transactions with or caused by an Interested Stockholder. These
include transactions in which the Interested Stockholder receives or could
receive a benefit on other than a pro rata basis with other stockholders,
transactions with the corporation which increase the proportionate interest in
the corporation directly or indirectly owned by the Interested Stockholder or
transactions in which the Interested Stockholder receives other benefits.

    The provisions of Section 203, coupled with our board of directors'
authority to issue preferred stock without further stockholder action, could
delay or frustrate the removal of incumbent directors or a change in our
control. The provisions could also discourage, impede or prevent a merger,
tender offer or proxy contest, even if the event would be favorable to the
interests of stockholders. Our stockholders, by adopting an amendment to our
amended and restated certificate of incorporation, may elect not to be governed
by Section 203 effective 12 months after the adoption. Neither our certificate
of incorporation nor our by-laws exclude us from the restrictions imposed by
Section 203.

                            DESCRIPTION OF WARRANTS

    We may issue warrants for the purchase of debt securities, preferred stock,
common stock or any combination thereof. Warrants may be issued independently or
together with any other securities offered in an applicable prospectus
supplement and may be attached to or separate from such securities. Warrants may
be issued under warrant agreements (each, a 'warrant agreement') to be entered
into between us and a warrant agent specified in the applicable prospectus
supplement. The warrant agent will act solely as our agent in connection with
the warrants of a particular series and will not assume any obligation or
relationship of agency or trust for or with any holders or beneficial owners of
warrants. The following sets forth certain general terms and provisions of
warrants which may be offered. Further terms of the warrants and the applicable
warrant agreement will be set forth in an applicable prospectus supplement.

DEBT WARRANTS

    The prospectus supplement relating to a particular issue of warrants for the
purchase of debt securities ('debt warrants') will describe the terms of the
debt warrants, including the following:

    the title of the debt warrants;

    the offering price for the debt warrants, if any;

                                       21






    the aggregate number of the debt warrants;

    the designation and terms of the debt securities purchasable upon exercise
    of the debt warrants;

    if applicable, the designation and terms of the debt securities that the
    debt warrants are issued with and the number of debt warrants issued with
    each debt security;

    if applicable, the date from and after which the debt warrants and any debt
    securities issued with them will be separately transferable;

    the principal amount of debt securities that may be purchased upon exercise
    of a debt warrant and the price at which the debt securities may be
    purchased upon exercise (which may be payable in cash, securities or other
    property);

    the dates on which the right to exercise the debt warrants will commence and
    expire;

    if applicable, the minimum or maximum amount of the debt warrants that may
    be exercised at any one time;

    information with respect to book-entry procedures, if any;

    the currency or currency units in which the offering price, if any, and the
    exercise price are payable;

    if applicable, a discussion of material United States federal income tax
    considerations;

    the antidilution provisions of the debt warrants, if any;

    the redemption or call provisions, if any, applicable to the debt warrants;
    and

    any additional terms of the debt warrants, including terms, procedures, and
    limitations relating to the exchange and exercise of the debt warrants.

STOCK WARRANTS

    The prospectus supplement relating to a particular issue of warrants for the
purchase of common stock or preferred stock will describe the terms of the
warrants, including the following:

    the title of the warrants;

    the offering price for the warrants, if any;

    the aggregate number of the warrants;

    the designation and terms of the common stock or preferred stock that may be
    purchased upon exercise of the warrants;

    if applicable, the designation and terms of the securities that the warrants
    are issued with and the number of warrants issued with each security;

    if applicable, the date from and after which the warrants and any securities
    issued with the warrants will be separately transferable;

    the number of shares of common stock or preferred stock that may be
    purchased upon exercise of a warrant and the price at which such shares may
    be purchased upon exercise;

    the dates on which the right to exercise the warrants will commence and
    expire;

    if applicable, the minimum or maximum amount of the warrants that may be
    exercised at any one time;

    the currency or currency units in which the offering price, if any, and the
    exercise price are payable;

    if applicable, a discussion of material United States federal income tax
    considerations;

    the antidilution provisions of the warrants, if any;

    the redemption or call provisions, if any, applicable to the warrants; and

    any additional terms of the warrants, including terms, procedures, and
    limitations relating to the exchange and exercise of the warrants.

                                       22






EXERCISE OF WARRANTS

    Each warrant will entitle the holder of warrants to purchase for cash the
amount of shares of preferred stock, shares of common stock or debt securities
at the exercise price as shall in each case be set forth in, or be determinable
as set forth in, the prospectus supplement relating to the warrants offered
thereby. Warrants may be exercised at any time up to the close of business on
the expiration date set forth in the prospectus supplement relating to the
warrants offered thereby. After the close of business on the expiration date,
unexercised warrants will become void.

    Warrants may be exercised as set forth in the prospectus supplement relating
to the warrants offered thereby. Upon receipt of payment and the warrant
certificate properly completed and duly executed at the corporate trust office
of the warrant agent or any other office indicated in the prospectus supplement,
we will, as soon as practicable, forward the shares of preferred stock, shares
of common stock or debt securities purchasable upon such exercise. If less than
all of the warrants represented by the warrant certificate are exercised, a new
warrant certificate will be issued for the remaining warrants.

THE UNIT OFFERING WARRANTS


    On May 18, 1999, we issued units composed of our 14 1/2% Senior Secured
Notes due 2009 and warrants to purchase an aggregate of 2,190,000 shares of
common stock at a price of $28.60 per share. These warrants were issued under a
warrant agreement, dated as of May 15, 1999, between us, as issuer, and United
States Trust Company of New York, as warrant agent. The number of shares of
common stock to be issued under these warrants will be adjusted in some cases if
we issue additional shares of common stock, options, warrants or convertible
securities and in some other events. These warrants expire on May 15, 2009. As
of September 30, 2003, there were 578,990 such warrants outstanding to purchase
2,425,389 shares of common stock at a price of $24.92 per share.


THE FORD WARRANT

    On October 7, 2002, we canceled an existing warrant previously issued to
Ford and issued a new warrant to Ford which entitles Ford to purchase up to
4,000,000 shares of our common stock at a purchase price of $3.00 per share.

    Ford's right to exercise this warrant vests:

    with respect to 200,000 shares of our common stock, on the date the first
    Ford vehicle with a Sirius radio installed by Ford or one of its dealers
    (each, a 'Ford Enabled Vehicle') is activated by us for a bona fide
    customer;

    with respect to 200,000 shares of our common stock, on the date the first
    Ford Enabled Vehicle that has a factory-installed Sirius radio is activated
    by us for a bona fide customer;

    with respect to 200,000 shares of our common stock, on the date that Ford
    and us jointly launch a national advertising campaign promoting our
    satellite radio service in Ford vehicles;

    with respect to 100,000 shares of our common stock, on each date that a
    Sirius radio is first available to be ordered by a bona fide customer as an
    original equipment option on a Ford vehicle line; provided that in no event
    will more than 1,400,000 shares of our common stock vest and become
    exercisable pursuant to this provision;

    with respect to one share of our common stock, upon the manufacture by Ford
    of each of the first 375,000 Ford Enabled Vehicles;

    with respect to 625,000 shares of our common stock, on the date that Ford
    has manufactured an aggregate of 375,000 Ford Enabled Vehicles;

    with respect to 500,000 shares of our common stock, on the date that Ford
    has manufactured an aggregate of 750,000 Ford Enabled Vehicles; and

    with respect to 500,000 shares of our common stock, on the date that Ford
    has manufactured an aggregate of 1,500,000 Ford Enabled Vehicles.

                                       23






    If Ford terminates the exclusivity provisions contained in our agreement, we
may reduce by one-half the number of shares granted and the number of shares of
our common stock that vest and become exercisable under this warrant.

    The number of shares of common stock to be issued under this warrant will be
adjusted in some cases if we issue stock dividends, combine stock, reorganize or
reclassify capital stock, merge, sell all of our assets and in some other
events. This warrant will expire on the earlier of October 6, 2012 and the date
of termination or expiration of the agreement, dated October 7, 2002, between us
and Ford.

    We are required to give Ford notice of adjustments in the number of shares
issuable under this warrant and of extraordinary corporate events.

THE DAIMLERCHRYSLER WARRANT

    On October 25, 2002, we canceled an existing warrant previously issued to
DaimlerChrysler and issued a new warrant to DaimlerChrysler which entitles
DaimlerChrysler to purchase up to 4,000,000 shares of our common stock at a
purchase price of $3.00 per share.

    DaimlerChrysler's right to exercise this warrant vests:

    with respect to 1,000,000 shares of common stock, on the date that
    DaimlerChrysler and its affiliates have manufactured 250,000 new vehicles
    containing Sirius radios ('DaimlerChrysler Enabled Vehicles');

    with respect to an additional 500,000 shares of common stock, on the date
    that DaimlerChrysler and its affiliates have manufactured an aggregate of
    800,000 DaimlerChrysler Enabled Vehicles;

    with respect to an additional 500,000 shares of common stock, on the date
    that DaimlerChrysler and its affiliates have manufactured an aggregate of
    1,600,000 DaimlerChrysler Enabled Vehicles;

    with respect to an additional 1,000,000 shares of common stock, on the date
    that DaimlerChrysler and its affiliates have manufactured an aggregate of
    2,400,000 DaimlerChrysler Enabled Vehicles; and

    with respect to an additional 1,000,000 shares of common stock, on the date
    that DaimlerChrysler and its affiliates have manufactured an aggregate of
    3,200,000 DaimlerChrysler Enabled Vehicles.

    The number of shares of common stock to be issued under this warrant will be
adjusted in some cases if we issue stock dividends, combine stock, reorganize or
reclassify capital stock, merge, sell all of our assets and in some other
events. This warrant will expire on the date of termination or expiration of the
agreement, dated October 25, 2002, among us, DaimlerChrysler Corporation,
Freightliner Corporation and Mercedes-Benz USA, Inc.

    We are required to give DaimlerChrysler notice of adjustments in the number
of shares issuable under this warrant and of extraordinary corporate events.

THE LEHMAN WARRANTS

    We have issued to Lehman warrants to purchase up to 2,100,000 shares of our
common stock at a purchase price of $15.00 per share. All of these warrants have
vested.

    525,000 of these warrants expire on December 27, 2010, 1,050,000 of these
warrants expire on March 7, 2011 and 525,000 warrants expire on April 4, 2011.
The number of shares of common stock to be issued under these warrants and the
exercise price of the warrants will be adjusted in some cases if we issue stock
dividends, subdivide or combine stock, reorganize or reclassify capital stock,
distribute cash dividends, issue common stock or other securities convertible
into common stock (other than in a bona fide underwritten public offering) and
in certain other events. We are also required to give Lehman notice of
adjustments in the number of shares issuable under these warrants and of
extraordinary corporate events.

                                       24






THE SERIES A WARRANTS AND SERIES B WARRANTS

    In connection with our recapitalization in March 2003, we issued (i) to
affiliates of Blackstone (a) Series A warrants to purchase up to 25,296,255
shares of our common stock at a purchase price of $1.04 per share and
(b) Series B warrants to purchase up to 16,864,169 shares of our common stock at
a purchase price of $0.92 per share and (ii) to affiliates of Apollo
(a) Series A warrants to purchase up to 27,250,013 shares of our common stock at
a purchase price of $1.04 per share and (b) Series B warrants to purchase up to
18,166,677 shares of our common stock at a purchase price of $0.92 per share.


    All of these warrants are currently exercisable. The Series A warrants and
the Series B warrants held by affiliates of Apollo may be exercised any time
prior to the close of business on March 7, 2005. The Series A warrants and the
Series B warrants held by affiliates of Blackstone may be exercised any time
prior to the close of business on September 7, 2004. On November 5, 2003,
Blackstone exercised 21,027,512 warrants, each with an exercise price of $1.04
per share, through a cashless exercise. In connection with this exercise, we
issued 11,531,805 shares of our common stock to Blackstone. The number of shares
of common stock to be issued under these warrants and the exercise price of the
warrants will be adjusted in some cases if we issue stock dividends, subdivide
or combine stock, reorganize or reclassify capital stock, distribute cash
dividends, issue common stock or other securities convertible into common stock
(other than in a bona fide underwritten public offering) and in certain other
events. We are also required to give the warrantholders notice of adjustments in
the number of shares issuable under these warrants and of extraordinary
corporate events.


                              PLAN OF DISTRIBUTION

    We may sell the securities:

    to one or more underwriters or dealers for public offering and sale by them;
    and

    to investors directly or through agents.

    The distribution of securities may be effected from time to time in one or
more transactions at a fixed price or prices (which may be changed from time to
time), at market prices prevailing at the time of sale, at prices related to
such prevailing market prices or at negotiated prices. Each prospectus
supplement will describe:

    the method of distribution of the securities offered thereby;

    the purchase price and the proceeds we will receive from the sale; and

    any securities exchanges on which the securities of such series may be
    listed.


    In connection with the sale of the securities, underwriters, dealers or
agents may receive compensation from us or from purchasers of the securities for
whom they may act as agents, in the form of discounts, concessions or
commissions. The underwriters, dealers or agents that participate in the
distribution of the securities may be deemed to be underwriters under the
Securities Act and any discounts or commissions received by them and any profit
on the resale of the securities received by them may be deemed to be
underwriting discounts and commissions thereunder. Any such underwriter, dealer
or agent will be identified and any such compensation received from us will be
described in the applicable prospectus supplement. Any such underwriter,
including any underwriter for an "at the market offering" within the meaning of
Rule 415 under the Securities Act, may include Bank of America Securities LLC,
Bear, Stearns & Co. Inc., BNY Capital Markets, Inc., Citigroup Capital Markets
Inc., HSBC Securities (USA) Inc., J.P. Morgan Securities Inc., Morgan Stanley
& Co. Incorporated, Lehman Brothers Inc., Merrill Lynch Capital Markets, SG
Cowen Securities Corporation, UBS Securities LLC or any of their respective
respective affiliated entities. Any initial public offering price and any
discounts or concessions allowed or paid to dealers may be changed from time to
time.


    Under the agreements that may be entered into with us, underwriters, dealers
and agents may be entitled to indemnification by us against certain civil
liabilities, including liabilities under the Securities Act, or to contribution
with respect to payments which the underwriters, dealers or agents may be
required to make in respect thereof.

    Each underwriter, dealer and agent participating in the distribution of any
securities that are issuable in bearer form will agree that it will not offer,
sell, resell or deliver, directly or indirectly, securities in bearer form to
persons located in the United States or to United States persons

                                       25






(other than qualifying financial institutions), in connection with the original
issuance of the securities.

    Certain of the underwriters or agents and their associates may be customers
of, engage in transactions with and perform services for us in the ordinary
course of business.

    Certain persons participating in an offering may engage in transactions that
stabilize, maintain or otherwise affect the price of the securities, including
over-allotment, stabilizing and short-covering transactions in such securities,
the imposition of a penalty bid, and bidding for and purchasing shares of our
common stock in the open market during and after an offering.

                                 LEGAL MATTERS

    Simpson Thacher & Bartlett LLP, New York, New York, will pass upon specific
legal matters under state law with respect to the securities.

                                    EXPERTS

    Our audited consolidated financial statements appearing in our Annual Report
on Form 10-K as of December 31, 2002 and for the year then ended have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
thereon included therein and incorporated herein by reference. Such consolidated
financial statements are incorporated herein by reference in reliance upon such
report given on authority of such firm as experts in accounting and auditing.

    Our audited consolidated financial statements appearing in our Annual Report
on Form 10-K as of December 31, 2001 and for each of the two years in the period
ended December 31, 2001 have been audited by Arthur Andersen LLP, independent
public accountants, as set forth in their report thereon included therein and
incorporated herein by reference. Such consolidated financial statements are
incorporated herein by reference in reliance upon such report given on the
authority of such firm as experts in accounting and auditing.

    Section 11(a) of the Securities Act provides that if a registration
statement at the time it becomes effective contains an untrue statement of a
material fact, or omits a material fact required to be stated therein or
necessary to make the statements therein not misleading, any person acquiring a
security pursuant to such registration statement (unless it is proven that at
the time of such acquisition such person knew of such untruth or omission) may
assert a claim against, among others, an accountant who has consented to be
named as having certified any part of the registration statement or as having
prepared any report for use in connection with the registration statement.

    On April 11, 2002, we dismissed Arthur Andersen LLP as our independent
auditors and appointed Ernst & Young LLP. Prior to the date of this prospectus,
the Arthur Andersen partner responsible for the audit of our most recent audited
financial statements as of and for the year ended December 31, 2001 resigned
from Arthur Andersen LLP. As a result, after reasonable efforts, we have been
unable to obtain Arthur Andersen's written consent to the incorporation by
reference into this prospectus of its audit reports with respect to our
consolidated financial statements as of December 31, 2001 and for each of the
two years in the period ended December 31, 2001. Under these circumstances,
Rule 437a under the Securities Act permits us to file this prospectus without a
written consent from Arthur Andersen LLP. However, as a result, Arthur Andersen
LLP will not have any liability under Section 11(a) of the Securities Act for
any untrue statements of a material fact contained in the consolidated financial
statements audited by Arthur Andersen LLP or any omissions of a material fact
required to be stated therein. Accordingly, you will be unable to assert a claim
against Arthur Andersen LLP under Section 11(a) of the Securities Act because it
has not consented to the incorporation by reference of its previously issued
report into this prospectus.

                                       26






                           INCORPORATION BY REFERENCE

    The SEC allows us to 'incorporate by reference' in this prospectus other
information we file with them, which means that we can disclose important
information to you by referring you to those documents. This prospectus
incorporates important business and financial information about us that is not
included in or delivered with this prospectus. The information we file later
with the SEC will automatically update and supersede the information included in
and incorporated by reference in this prospectus. We incorporate by reference
the documents listed below and any future filings made with the SEC under
Sections 13(a), 13(c), 14, or 15(d) of the Exchange Act until we sell all the
securities covered by this prospectus.

        1. Our Annual Report on Form 10-K for the year ended December 31, 2002.

        2. Our Quarterly Reports on Form 10-Q for the quarters ended March 31,
    2003, June 30, 2003 and September 30, 2003.



        3. Our Current Reports on Form 8-K dated May 1, 2003, May 14, 2003,
    May 21, 2003, May 30, 2003, June 16, 2003, July 30, 2003, August 6, 2003 and
    October 29, 2003.

        4. The description of our common stock contained in our Registration
    Statement on Form 8-A filed pursuant to Section 12(b) of the Exchange Act.

    We have filed each of these documents with the SEC and they are available
from the SEC's internet site and public reference rooms described under 'Where
You May Find Additional Available Information About Us' in this prospectus. You
may also request a copy of these filings, at no cost, by writing or calling us
at the following address or telephone number:

                              Patrick L. Donnelly
            Executive Vice President, General Counsel and Secretary
                          Sirius Satellite Radio Inc.
                    1221 Avenue of the Americas, 36th Floor
                            New York, New York 10020
                                 (212) 584-5100

    You should rely only on the information incorporated by reference or
provided in this prospectus or any prospectus supplement. We have not authorized
anyone else to provide you with different information.

          WHERE YOU MAY FIND ADDITIONAL AVAILABLE INFORMATION ABOUT US

    We file annual, quarterly and current reports, proxy statements and other
information with the SEC. You may read and copy any of these reports, statements
or other information at the SEC's public reference room at 450 Fifth Street,
N.W., Washington, D.C. 20549 or at its regional offices. You can request copies
of those documents, upon payment of a duplicating fee, by writing to the SEC.
Please call the SEC at 1-800-SEC-0330 for further information on the public
reference rooms. Our SEC filings are also available to the public at the SEC's
internet site at http://www.sec.gov.

                                       27






================================================================================

                                  $500,000,000

                                  [SIRIUS LOGO]

                       DEBT SECURITIES, PREFERRED STOCK,
                           COMMON STOCK AND WARRANTS

                               ------------------
                                   PROSPECTUS
                               ------------------

    We have not authorized any dealer, salesperson or other person to give
    any information or represent anything contained in this prospectus. You
    must not rely on any unauthorized information. This prospectus does not
    offer to sell nor does it solicit to buy any securities in any
    jurisdiction where it is unlawful.

                                       , 2003

================================================================================






                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

    The following table sets forth all expenses, other than the underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of the securities being registered. All the amounts shown are estimates except
for the registration fee and the filing fee.



                                                           
Registration fee............................................  $   40,450
Trustee's fees..............................................  $  100,000
Legal fees and expenses.....................................  $  600,000
Accounting fees and expenses................................  $  300,000
Printing and engraving......................................  $  300,000
Rating agency fees..........................................  $   20,000
Blue sky fees and expenses..................................  $   10,000
NASD filing fees............................................  $   50,000
Listing fee.................................................  $   50,000
Miscellaneous...............................................  $   31,000
                                                              ----------
    Total...................................................  $1,501,450
                                                              ----------
                                                              ----------



ITEM 15. INDEMNIFICATION OF OFFICERS AND DIRECTORS.

    Section 145 of the DGCL permits each Delaware business corporation to
indemnify its directors, officers, employees and agents against liability for
each such person's acts taken in his or her capacity as a director, officer,
employee or agent of the corporation if such actions were taken in good faith
and in a manner which he or she reasonably believed to be in or not opposed to
the best interests of the corporation, and with respect to any criminal action,
if he or she had no reasonable cause to believe his or her conduct was unlawful.
Article VII of our Amended and Restated By-Laws provides that we, to the full
extent permitted by Section 145 of the DGCL, shall indemnify all of our past and
present directors and may indemnify all of our past or present employees or
other agents. To the extent that a director, officer, employee or agent of ours
has been successful on the merits or otherwise in defense of any action, suit or
proceeding referred to in such Article VII, or in defense of any claim, issue or
matter therein, he or she shall be indemnified by us against actually and
reasonably incurred expenses in connection therewith. Such expenses may be paid
by us in advance of the final disposition of the action upon receipt of an
undertaking to repay the advance if it is ultimately determined that such person
is not entitled to indemnification.

    As permitted by Section 102(b)(7) of the DGCL, our Amended and Restated
Certificate of Incorporation provides that no director shall be liable to us for
monetary damages for breach of fiduciary duty as a director, except for
liability:

        (i)   for any breach of the director's duty of loyalty to us or our
              stockholders;

        (ii)  for acts or omissions not in good faith or which involve
              intentional misconduct or a knowing violation of law;

        (iii)  for the unlawful payment of dividends on or redemption of our
               capital stock; or

        (iv)  for any transaction from which the director derived an improper
              personal benefit.

    We have obtained a policy insuring us and our directors and officers against
certain liabilities, including liabilities under the Securities Act.

                                      II-1






ITEM 16. EXHIBITS.



EXHIBIT
 NUMBER                          DESCRIPTION
 ------                          -----------
        
    1.1 -- Form of Underwriting Agreement.**

    4.1 -- Form of certificate for shares of Common Stock (incorporated by
           reference to Exhibit 4.3 to the Company's Registration Statement on
           Form S-1 (File No. 33-74782) (the 'S-1 Registration Statement')).

  4.2.1 -- Rights Agreement, dated as of October 22, 1997 (the 'Rights
           Agreement'), between the Company and Continental Stock Transfer &
           Trust Company, as rights agent (incorporated by reference to Exhibit
           1 to the Company's Registration Statement on Form 8-A filed on
           October 30, 1997 (the 'Form 8-A')).

  4.2.2 -- Form of Right Certificate (incorporated by reference to Exhibit B to
           Exhibit 1 to the Form 8-A).

  4.2.3 -- Amendment to the Rights Agreement dated as of October 13, 1998
           (incorporated by reference to Exhibit 99.2 to the Company's Current
           Report on Form 8-K dated October 13, 1998).

  4.2.4 -- Amendment to the Rights Agreement dated as of November 13, 1998
           (incorporated by reference to Exhibit 99.7 to the Company's Current
           Report on Form 8-K dated November 17, 1998).

  4.2.5 -- Amended and Restated Amendment to the Rights Agreement dated as of
           December 22, 1998 (incorporated by reference to Exhibit 6 to
           Amendment No. 1 to the Form 8-A filed on January 6, 1999).

  4.2.6 -- Amendment to the Rights Agreement dated as of June 11, 1999
           (incorporated by reference to Exhibit 4.1.8 to the Company's
           Registration Statement on Form S-4 (File No. 333-82303) (the '1999
           Units Registration Statement')).

  4.2.7 -- Amendment to the Rights Agreement dated as of September 29, 1999
           (incorporated by reference to Exhibit 4.1 to the Company's Current
           Report on Form 8-K filed on October 13, 1999).

  4.2.8 -- Amendment to the Rights Agreement dated as of December 23, 1999
           (incorporated by reference to Exhibit 99.4 to the Company's Current
           Report on Form 8-K filed on December 29, 1999).

  4.2.9 -- Amendment to the Rights Agreement dated as of January 28, 2000
           (incorporated by reference to Exhibit 4.6.9 to the Company's Annual
           Report on Form 10-K for the year ended December 31, 1999 (the '1999
           Form 10-K')).

 4.2.10 -- Amendment to the Rights Agreement dated as of August 7, 2000
           (incorporated by reference to Exhibit 4.6.10 to the Company's
           Quarterly Report on Form 10-Q for the quarter ended September 30,
           2000).

 4.2.11 -- Amendment to the Rights Agreement dated as of January 8, 2002
           (incorporated by reference to Exhibit 4.6.11 to the Company's Annual
           Report on Form 10-K for the year ended December 31, 2001 (the '2001
           Form 10-K')).

 4.2.12 -- Amendment to the Rights Agreement dated as of October 22, 2002
           (incorporated by reference to Exhibit 99.1 to the Company's Current
           Report on Form 8-K filed on October 24, 2002).

 4.2.13 -- Amendment to Rights Agreement dated as of March 6, 2003 (incorporated
           by reference to Exhibit 4.2.13 to the Company's Annual Report on Form
           10-K for the year ended December 31, 2002).

 4.2.14 -- Amendment to the Rights Agreement dated as of April 30, 2003
           (incorporated by reference to Exhibit 99.1 to the Company's Current
           Report on Form 8-K dated May 1, 2003).


                                      II-2








EXHIBIT
 NUMBER                          DESCRIPTION
 ------                          -----------
        
 4.2.15 -- Amendment to the Rights Agreement dated as of July 30, 2003
           (incorporated by reference to Exhibit 99.1 to the Company's Current
           Report on Form 8-K dated July 30, 2003).

    4.3 -- Indenture, dated as of November 26, 1997, between the Company and IBJ
           Schroder Bank & Trust Company, as trustee, relating to the Company's
           15% Senior Secured Discount Notes due 2007 (incorporated by reference
           to Exhibit 4.1 to the Company's Registration Statement on Form S-3
           (File No. 333-34769) (the '1997 Units Registration Statement')).

    4.4 -- Supplemental Indenture, dated as of March 7, 2003, between the
           Company and The Bank of New York (as successor to IBJ Schroder Bank &
           Trust Company), as trustee, relating to the Company's 15% Senior
           Secured Discount Notes due 2007 (incorporated by reference to Exhibit
           4.4 to the Company's Annual Report on Form 10-K for the year ended
           December 31, 2002).

    4.5 -- Form of 15% Senior Secured Discount Note due 2007 (incorporated by
           reference to Exhibit 4.2 to the 1997 Units Registration Statement).

    4.6 -- Warrant Agreement, dated as of November 26, 1997, between the Company
           and IBJ Schroder Bank & Trust Company, as warrant agent (incorporated
           by reference to Exhibit 4.3 to the 1997 Units Registration
           Statement).

    4.7 -- Form of Warrant (incorporated by reference to Exhibit 4.4 to the 1997
           Units Registration Statement).

    4.8 -- Form of Common Stock Purchase Warrant granted by the Company to
           Everest Capital Master Fund, L.P. and to The Ravich Revocable Trust
           of 1989 (incorporated by reference to Exhibit 4.11 to the Company's
           Annual Report on Form 10-K for the year ended December 31, 1997).

    4.9 -- Indenture, dated as of May 15, 1999, between the Company and United
           States Trust Company of New York, as trustee, relating to the
           Company's 14 1/2% Senior Secured Notes due 2009 (incorporated by
           reference to Exhibit 4.4.2 to the 1999 Units Registration Statement).

   4.10 -- Supplemental Indenture, dated as of March 7, 2003, between the
           Company and The Bank of New York (as successor to United States Trust
           Company of New York), as trustee, relating to the Company's 14 1/2%
           Senior Secured Notes due 2009 (incorporated by reference to Exhibit
           4.10 to the Company's Annual Report on Form 10-K for the year ended
           December 31, 2002).

   4.11 -- Form of 14 1/2% Senior Secured Note due 2009 (incorporated by
           reference to Exhibit 4.4.3 to the 1999 Units Registration Statement).

   4.12 -- Warrant Agreement, dated as of May 15, 1999, between the Company and
           United States Trust Company of New York, as warrant agent
           (incorporated by reference to Exhibit 4.4.4 to the 1999 Units
           Registration Statement).

   4.13 -- Common Stock Purchase Warrant granted by the Company to Ford Motor
           Company, dated October 7, 2002 (incorporated by reference to Exhibit
           4.16 to the Company's Quarterly Report on Form 10-Q for the quarter
           ended September 30, 2002).

   4.14 -- Indenture, dated as of September 29, 1999, between the Company and
           United States Trust Company of Texas, N.A., as trustee, relating to
           the Company's 8 3/4% Convertible Subordinated Notes due 2009
           (incorporated by reference to Exhibit 4.2 to the Company's Current
           Report on Form 8-K filed on October 13, 1999).

   4.15 -- First Supplemental Indenture, dated as of September 29, 1999, between
           the Company and United States Trust Company of Texas, N.A., as
           trustee, relating to the Company's 8 3/4% Convertible Subordinated
           Notes due 2009 (incorporated by reference to Exhibit 4.01 to the
           Company's Current Report on Form 8-K filed on October 1, 1999).


                                      II-3








EXHIBIT
 NUMBER                          DESCRIPTION
 ------                          -----------
        
   4.16 -- Second Supplemental Indenture, dated as of March 4, 2003, among the
           Company, The Bank of New York (as successor to United States Trust
           Company of Texas, N.A.), as resigning trustee, and HSBC Bank USA, as
           successor trustee, relating to the Company's 8 3/4% Convertible
           Subordinated Notes due 2009 (incorporated by reference to Exhibit
           4.16 to the Company's Annual Report on Form 10-K for the year ended
           December 31, 2002).

   4.17 -- Third Supplemental Indenture, dated as of March 7, 2003, between the
           Company and HSBC Bank USA, as trustee, relating to the Company's 8
           3/4% Convertible Subordinated Notes due 2009 (incorporated by
           reference to Exhibit 4.17 to the Company's Annual Report on Form 10-K
           for the year ended December 31, 2002).

   4.18 -- Form of 8 3/4% Convertible Subordinated Note due 2009 (incorporated
           by reference to Article VII of Exhibit 4.01 to the Company's Current
           Report on Form 8-K filed on October 1, 1999).

   4.19 -- Indenture, dated as of May 23, 2003, between the Company and The Bank
           of New York, as trustee, relating to senior indebtedness of the
           Company (incorporated by reference to Exhibit 99.2 to the Company's
           Current Report on Form 8-K dated May 30, 2003).

   4.20 -- Supplemental Indenture, dated as of May 23, 2003, between the Company
           and The Bank of New York, as trustee, relating to the Company's 3
           1/2% Convertible Notes due 2008 (incorporated by reference to Exhibit
           99.3 to the Company's Current Report on Form 8-K dated May 30, 2003).

   4.21 -- Form of 3 1/2% Convertible Note due 2008 (incorporated by reference
           to Exhibit A of Exhibit 99.3 to the Company's Current Report on Form
           8-K dated May 30, 2003).

   4.22 -- Common Stock Purchase Warrant granted by the Company to
           DaimlerChrysler Corporation dated October 25, 2002 (incorporated by
           reference to Exhibit 4.20 to the Company's Quarterly Report on Form
           10-Q for the quarter ended September 30, 2002).

   4.23 -- Form of Series A Common Stock Purchase Warrant dated March 7, 2003
           (incorporated by reference to Exhibit 4.20 to the Company's Annual
           Report on Form 10-K for the year ended December 31, 2002).

   4.24 -- Form of Series B Common Stock Purchase Warrant dated March 7, 2003
           (incorporated by reference to Exhibit 4.21 to the Company's Annual
           Report on Form 10-K for the year ended December 31, 2002).

   4.25 -- Amended and Restated Warrant Agreement, dated as of December 27,
           2000, between the Company and United States Trust Company of New
           York, as warrant agent and escrow agent (incorporated by reference to
           Exhibit 4.27 to the Company's Registration Statement on Form S-3
           (File No. 333-65602)).

   4.26 -- Second Amended and Restated Pledge Agreement, dated as of March 7,
           2001, among the Company, as pledgor, The Bank of New York, as trustee
           and collateral agent, United States Trust Company of New York, as
           trustee, and Lehman Commercial Paper Inc., as administrative agent
           (incorporated by reference to Exhibit 4.25 to the Company's Quarterly
           Report on Form 10-Q for the quarter ended September 30, 2001).

   4.27 -- Collateral Agreement, dated as of March 7, 2001, between the Company,
           as borrower, and The Bank of New York, as collateral agent
           (incorporated by reference to Exhibit 4.26 to the Company's Quarterly
           Report on Form 10-Q for the quarter ended September 30, 2001).

   4.28 -- Amended and Restated Intercreditor Agreement, dated as of March 7,
           2001, by and between The Bank of New York, as trustee and collateral
           agent, United States Trust Company of New York, as trustee, and
           Lehman Commercial Paper Inc., as administrative agent (incorporated
           by reference to Exhibit 4.27 to the Company's Quarterly Report on
           Form 10-Q for the quarter ended September 30, 2001).


                                      II-4









EXHIBIT
 NUMBER                          DESCRIPTION
 ------                          -----------
       
   4.29 -- Form of Subordinate Indenture (incorporated by reference to Exhibit
           4.6.2 to the Company's Registration Statement on Form S-3 (File No.
           333-86003)).

    5.1 -- Opinion of Simpson Thacher & Bartlett LLP regarding legality.*

   12.1 -- Statement re: Computation of Ratio of Earnings to Combined Fixed
           Charges and Preferred Stock Dividends (filed herewith).

   23.1 -- Consent of Independent Auditors (filed herewith).

   23.2 -- Notice Regarding Consent of Arthur Andersen LLP.*

   23.3 -- Consent of Simpson Thacher & Bartlett LLP (included in Exhibit 5.1).

   24.1 -- Powers of Attorney.*

   25.1 -- Statement of Eligibility and Qualification on Form T-1 of the Trustee
           to act as Trustee under the Indenture (filed herewith).




---------
  *  Filed previously.

 **  To be filed by amendment or by a Current Report on Form 8-K
     in accordance with Regulation S-K, Item 601(b).


ITEM 17. UNDERTAKINGS

    The undersigned registrant hereby undertakes:

        (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this registration statement:

            (i)   To include any prospectus required by Section 10(a)(3) of the
                  Securities Act of 1933.

            (ii)  To reflect in the prospectus any facts or events arising after
                  the effective date of the registration statement (or the most
                  recent post-effective amendment thereof) which, individually
                  or in the aggregate, represent a fundamental change in the
                  information set forth in the registration statement.
                  Notwithstanding the foregoing, any increase or decrease in
                  volume of securities offered (if the total dollar value of
                  securities offered would not exceed that which was registered)
                  and any deviation from the low or high end of the estimated
                  maximum offering range may be reflected in the form of
                  prospectus filed with the Commission pursuant to Rule 424(b)
                  if, in the aggregate, the changes in volume and price
                  represent no more than 20 percent change in the maximum
                  aggregate offering price set forth in the 'Calculation of
                  Registration Fee' table in the effective registration
                  statement.

            (iii) To include any material information with respect to the plan
                  of distribution not previously disclosed in the registration
                  statement or any material change to such information in the
                  registration statement;

    provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
    information required to be included in a post-effective amendment by those
    paragraphs is contained in periodic reports filed with or furnished to the
    Commission by the registrant pursuant to Section 13 or 15(d) of the
    Securities Exchange Act of 1934 that are incorporated by reference in the
    registration statement.

        (2) That, for the purpose of determining any liability under the
    Securities Act of 1933, each such post-effective amendment that contains a
    form of prospectus shall be deemed to be a new registration statement
    relating to the securities offered therein, and the offering of such
    securities at that time shall be deemed to be the initial bona fide offering
    thereof.

                                      II-5






        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.

        (4) The undersigned registrant hereby undertakes that, for purposes of
    determining any liability under the Securities Act of 1933, each filing of
    the registrant's annual report pursuant to Section 13(a) or 15(d) of the
    Securities Exchange Act of 1934 (and, where applicable, each filing of an
    employee benefit plan's annual report pursuant to Section 15(d) of the
    Exchange Act) that is incorporated by reference in the registration
    statement shall be deemed to be a new registration statement relating to the
    securities offered therein, and the offering of such securities at that time
    shall be deemed to be the initial bona fide offering thereof.

        (5) Insofar as indemnification for liabilities arising under the
    Securities Act of 1933 may be permitted to directors, officers and
    controlling persons of the registrant pursuant to provisions described in
    Item 15, or otherwise, the registrant has been advised that in the opinion
    of the Securities and Exchange Commission such indemnification is against
    public policy as expressed in the Securities Act and is, therefore,
    unenforceable. In the event that a claim for indemnification against such
    liabilities (other than the payment by the registrant of expenses incurred
    or paid by a director, officer or controlling person of the registrant in
    the successful defense of any action, suit or proceeding) is asserted by
    such director, officer of controlling person in connection with the
    securities being registered, the registrant will, unless in the opinion of
    its counsel the matter has been settled by controlling precedent, submit to
    a court of appropriate jurisdiction the question whether such
    indemnification by it is against public policy as expressed in the
    Securities Act and will be governed by the final adjudication of such issue.

                                      II-6






                                   SIGNATURES


    Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this amendment to the
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of New York, State of New York, on November 17,
2003.


                                               SIRIUS SATELLITE RADIO INC.
                                          By:         /s/ DAVID J. FREAR
                                              ..................................
                                                       DAVID J. FREAR
                                                EXECUTIVE VICE PRESIDENT AND
                                                   CHIEF FINANCIAL OFFICER


    Pursuant to the requirements of the Securities Act, this amendment to the
registration statement has been signed by the following persons in the
capacities and on the dates indicated.





                SIGNATURE                                TITLE
                ---------                                -----
                                                                               
          /s/ JOSEPH P. CLAYTON            President, Chief Executive Officer and    November 17, 2003
..........................................    Director (principal executive officer)
            JOSEPH P. CLAYTON

           /s/ DAVID J. FREAR              Executive Vice President and Chief        November 17, 2003
..........................................    Financial Officer (principal
             DAVID J. FREAR                  financial officer)

         /s/ EDWARD WEBER, JR.             Vice President and Controller             November 17, 2003
..........................................    (principal accounting officer)
           EDWARD WEBER, JR.

                   *                       Chairman of the Board and Director        November 17, 2003
..........................................
             DAVID MARGOLESE

                   *                       Director                                  November 17, 2003
..........................................
             LEON D. BLACK

                   *                       Director                                  November 17, 2003
..........................................
          LAWRENCE F. GILBERTI

                   *                       Director                                  November 17, 2003
..........................................
            JAMES P. HOLDEN

                   *                       Director                                  November 17, 2003
..........................................
           MICHAEL MCGUINESS

                   *                       Director                                  November 17, 2003
..........................................
            JAMES F. MOONEY


*By:   /S/ PATRICK L. DONNELLY
    .....................................
           PATRICK L. DONNELLY
             ATTORNEY-IN-FACT



                                      II-7