MADISON DEARBORN CAPITAL PARTNERS III LP
SC 13D, 2000-08-18
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13D
                                      UNDER
                       THE SECURITIES EXCHANGE ACT OF 1934

                        XM SATELLITE RADIO HOLDINGS INC.
                                (Name of Issuer)


                      CLASS A COMMON STOCK, $.01 PAR VALUE
                         (Title of class of securities)

                                   983759-10-1
                                 (CUSIP Number)

                             Lewis Fickett III, Esq.
                              Edwards & Angell, LLP
                               101 Federal Street
                              Boston, MA 02110-1800
                                 (617) 439-4444
                 (Name, Address, and Telephone Number of person
                authorized to receive notices and communications)

                                 August 8, 2000
             (Date of event which requires filing of this statement)

     If the filing  person has  previously  filed a statement on Schedule 13G to
     report the  acquisition  which is the subject of this  Schedule 13D, and is
     filing  this  schedule  because  of Rule  13d-1  (b)(3)  or (4),  check the
     following box: [__].

     *The  remainder  of this cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
     deemed to be  "filed"  for the  purpose  of  Section  18 of the  Securities
     Exchange  Act of 1934 (the  "Exchange  Act") or  otherwise  subject  to the
     liabilities of that section of the Exchange Act but shall be subject to all
     other provisions of the Exchange Act (however, see the Notes).


<PAGE>


CUSIP No. 983759-10-1

1.  Name of Reporting Person / I.R.S. Identification No. of  Above Person

    Madison Dearborn Capital Partners III, L.P.

2.  Check the Appropriate Box if a Member of a Group

    (a) _____ (b) _____

3.  SEC Use Only

4.  Source of Funds

    OO

5.  Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items
    2(d) or 2(e)

6.  Citizenship or Place of Organization

    Virginia

Number of              7      Sole Voting Power
Shares
Beneficially                  4,546,295,321*

Owned By               8      Shared Voting Power
Each
Reporting                     117,123,132**

Person With            9      Sole Dispositive Power

                              4,546,295,321*

                      10      Shared Dispositive Power

                              117,123,132**


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     4,663,418.453***

12.  Check if the Aggregate Amount in Row (11) Excludes Certain Shares

13.  Percent of Class Represented by Amount in Row (11)

     13.58%****

14.  Type of Reporting Person

     PN


<PAGE>


CUSIP No. 983759-10-1

1.  Name of Reporting Person / I.R.S. Identification No. of  Above Person

    Madison Dearborn Special Equity III, L.P.

2.  Check the Appropriate Box if a Member of a Group

    (a) _____ (b) _____

3.  SEC Use Only

4.  Source of Funds

    OO

5.  Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items
    2(d) or 2(e)

6.  Citizenship or Place of Organization

    Delaware

Number of              7      Sole Voting Power
Shares
Beneficially                  100,944,132**

Owned By               8      Shared Voting Power
Each
Reporting                     4,562,042*

Person With            9      Sole Dispositive Power

                              100,944,132**

                      10      Shared Dispositive Power

                              4,562,042*


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     4,663,418.453***

12.  Check if the Aggregate Amount in Row (11) Excludes Certain Shares

13.  Percent of Class Represented by Amount in Row (11)

     13.58%****

14.  Type of Reporting Person

     PN


<PAGE>


CUSIP No. 983759-10-1

1.  Name of Reporting Person / I.R.S. Identification No. of  Above Person

    Special Advisors Fund I, LLC

2.  Check the Appropriate Box if a Member of a Group

    (a) _____ (b) _____

3.  SEC Use Only

4.  Source of Funds

    OO

5.  Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items
    2(d) or 2(e)

6.  Citizenship or Place of Organization

    Delaware

Number of              7      Sole Voting Power
Shares
Beneficially                  16,179

Owned By               8      Shared Voting Power
Each
Reporting                     4,647,239.453***

Person With            9      Sole Dispositive Power

                              16,179

                      10      Shared Dispositive Power

                              4,647,239.453***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     4,663,418.453***

12.  Check if the Aggregate Amount in Row (11) Excludes Certain Shares

13.  Percent of Class Represented by Amount in Row (11)

     13.58%****

14.  Type of Reporting Person

     CO


<PAGE>


CUSIP No. 983759-10-1

1.  Name of Reporting Person / I.R.S. Identification No. of  Above Person

    Madison Dearborn Partners III, L.P.

2.  Check the Appropriate Box if a Member of a Group

    (a) _____ (b) _____

3.  SEC Use Only

4.  Source of Funds

    OO

5.  Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items
    2(d) or 2(e)

6.  Citizenship or Place of Organization

    Delaware

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     4,663,418.453***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              4,663,418.453***

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     4,663,418.453***

12.  Check if the Aggregate Amount in Row (11) Excludes Certain Shares

13.  Percent of Class Represented by Amount in Row (11)

     13.58%****

14.  Type of Reporting Person

     PN


<PAGE>


CUSIP No. 983759-10-1

1.  Name of Reporting Person / I.R.S. Identification No. of  Above Person

    Madison Dearborn Partners, LLC

2. Check the Appropriate Box if a Member of a Group

   (a) _____ (b) _____

3.  SEC Use Only

4.  Source of Funds

    OO

5.  Check Box if Disclosure of Legal Proceedings is Required Pursuant to Items
    2(d) or 2(e)

6.  Citizenship or Place of Organization

    Cayman Islands

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     4,663,418.453***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              4,663,418.453***

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     4,663,418.453***

12.  Check if the Aggregate Amount in Row (11) Excludes Certain Shares

13.  Percent of Class Represented by Amount in Row (11)

     13.58%****

14.  Type of Reporting Person

     CO

<PAGE>

                                       Key

*        This total of shares of Class A Common  Stock $.01 par value  ("Class A
         Stock") of XM Satellite Radio Holdings,  Inc.  ("Issuer")  includes the
         shares of Class A Stock of which Madison Dearborn Capital Partners III,
         L.P. ("MDCP") or Madison Dearborn Special Equity III, L.P. ("MDSE") may
         acquire  beneficial  ownership  upon the conversion of 48,914 shares of
         8.25%  Series C  Convertible  Redeemable  Preferred  Stock  ("Preferred
         Stock") of the  Issuer  which MDCP  purchased  August 8, 2000.  At this
         time,  the  48,914  shares of  Preferred  Stock may be  converted  into
         1,845,811.321 shares of Class A Stock.

**       This  total of shares of Class A Stock  includes  the shares of Class A
         Stock of which MDCP or MDSE may acquire  beneficial  ownership upon the
         conversion of 1,086 shares of Preferred  Stock which MDSE  purchased on
         August 8, 2000. At this time,  the 1,086 shares of Preferred  Stock may
         be converted into 40,981.132 shares of Class A Stock.

***      This  total of  shares of Class A Stock  includes  the Class A Stock of
         which MDCP, MDSE,  Special  Advisors Fund I, LLC ("Special  Advisors"),
         Madison Dearborn III, L.P. ("MDP III") and Madison  Dearborn  Partners,
         LLC  ("MDP")  (collectively,   the  "Reporting  Persons")  may  acquire
         beneficial  ownership upon the conversion of 50,000 shares of Preferred
         Stock  held by MDCP and  MDSE.  At this  time,  the  50,000  shares  of
         Preferred Stock may be converted into  1,886,792.453  shares of Class A
         Stock.

****     This value for a percentage of Class A Stock owned by Reporting Persons
         reflects the shares of Class A Stock which may be acquired by Reporting
         Persons upon the conversion of 50,000 shares of Preferred Stock held by
         MDCP and MDSE as Class A Stock  owned  by  Reporting  Persons  and as a
         portion of the total number of shares of Class A Stock outstanding.

Item 1.  Security and Issuer

This  Statement  relates  to Class A Stock.  The  Issuer's  principal  executive
offices  are located at 1500  Eckington  Place,  NE  Washington,  DC 20002.  The
Reporting  Persons (as defined below) have entered into a Joint Filing Agreement
dated August 8, 2000, a copy of which is attached hereto as Exhibit 1.

Item 2.  Identity and Background

This Statement is being filed by MDCP, a Delaware limited  partnership,  MDSE, a
Delaware limited  partnership,  Special  Advisors,  a Delaware limited liability
company, MDP III, a Delaware limited partnership, and by MDP, a Delaware limited
liability company. MDP III is the sole general partner of MDCP, MDSE and Special
Advisors.  MDP is the sole general  partner of MDP III.  Dispositive  and voting
powers of the  Securities  owned by MDP III are  shared  by MDP and an  advisory
committee of limited partners of MDP.

The principal  business address of each of the Reporting  Persons is Three First
National Plaza, Suite 3800, Chicago, Illinois 60602.

MDCP,  MDSE and Special  Advisors  are  principally  engaged in the  business of
investing in securities. MDP III is engaged primarily in the business of serving
as a general  partner  for  MDCP,  MDSE and  Special  Advisors.  MDP is  engaged
primarily in the business of serving as the general partner of MDP III.

This  Statement  covers the 2,776,626  shares of Class A Stock acquired by MDCP,
MDSE and  Special  Advisors  on  October 8, 1999 and the shares of Class A Stock
which MDCP and MDSE may  acquire  upon the  conversion  of the 50,000  shares of
Preferred  Stock which MDSE and MDCP  purchased on August 8, 2000. At this time,
the 50,000 shares of Preferred Stock may be converted into 1,886,792.453  shares
of Class A Stock.

None of the Reporting Persons nor, to the best of their knowledge, the Reporting
Persons'  executive  officers,   managing  directors  or  general  partners  (as
applicable)  has,  during  the last five  years,  been  convicted  in a criminal
proceeding  (excluding traffic violations or similar misdemeanors) or been party
to a  civil  proceeding  of a  judicial  or  administrative  body  of  competent
jurisdiction  and  as a  result  of  such  proceedings  was or is  subject  to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating  activities subject to, federal or state securities laws or finding
any violation with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration

On October 6, 1999 and October 8, 1999, MDCP acquired  2,700,484 shares of Class
A Stock,  MDSE  acquired  59,963  shares of Class A Stock and  Special  Advisors
acquired  16,179  shares of Class A Stock by means of a conversion of a note and
by direct  purchases.  MDCP invested  $24,310,208.22  in the note, MDSE invested
$539,791.78 in the note and Special Advisors  invested $150,000 in the note. The
note converted into 2,622,222 shares of Class A Stock for MDCP, 58,225 shares of
Class A Stock for MDSE and 16,179 shares of Class A Stock for Special  Advisors.
MDCP  purchased  78,262 shares of Class A Stock for $939,144 and MDSE  purchased
1,738 shares of Class A Stock for  $20,856.  On August 8, 2000,  MDCP  purchased
48,914 shares of Preferred  Stock and MDSE  purchased  1,086 shares of Preferred
Stock for a total purchase price of  $50,000,000.  The shares of Preferred Stock
may be  converted  into shares of Class A Stock under a formula set forth in the
Certificate  of  Designation  filed by the Issuer with the Secretary of State of
the State of  Delaware on August 8, 2000.  At this time,  the price at which the
shares of  Preferred  Stock may be converted  into Class A Stock is $26.50.  The
Reporting  Persons'  sources  of funds for  these  acquisitions  of shares  were
capital contributions from the Reporting Persons' investors and working capital.

Item 4.  Purpose of Transaction

MDCP  acquired the 2,700,484  shares of Class A Stock,  MDSE acquired the 59,963
shares of Class A Stock and Special Advisors acquired the 16,179 shares of Class
A Stock and MDCP purchased  48,914 of Preferred  Stock and MDSE purchased  1,086
shares  of  Preferred  Stock in order to  demonstrate  their  commitment  to the
Issuer's long-term business plans and objectives.

Certain of MDCP's,  MDSE's and  Special  Advisors'  rights  with  respect to the
Issuer are  governed  by an amended and  restated  shareholders  agreement  (the
"Shareholders  Agreement")  dated as of August 8, 2000 by and among the  Issuer,
Special Advisors,  MDCP, MDSE and certain other significant  stockholders of the
Issuer.  Certain material provisions of the Agreement are described in detail in
Item 6 below. The Shareholders  Agreement is incorporated herein by reference as
Exhibit 2.

Except as described in this Item 4 and below in Item 6, the Reporting Persons do
not have any plans or  proposals  that  relate to or would  result in any of the
actions or events  specified  in clauses  (a)  through (j) of Item 4 of Schedule
13D.  Notwithstanding  the foregoing,  and subject to the restrictions under the
Shareholders  Agreement,  the  Reporting  Persons may  determine to change their
investment  intent  with  respect  to the Issuer at any time in the  future.  In
determining from time to time whether to sell their shares of the Issuer's Class
A Stock or Preferred  Stock (and in what amounts) or to retain such shares,  the
Reporting  Persons  will  take  into  consideration  such  factors  as they deem
relevant, including the business and prospects of the Issuer, anticipated future
developments  concerning the Issuer,  existing and anticipated market conditions
from time to time, general economic  conditions,  regulatory matters,  and other
opportunities  available to the Reporting Persons. The Reporting Persons reserve
the right to acquire additional  securities of the Issuer in the open market, in
privately  negotiated  transactions  (which may be with the Issuer or with third
parties)  or  otherwise,  to dispose of all or a portion  of their  holdings  of
securities of the Issuer or to change their intention with respect to any or all
of the matters referred to in this Item 4.

Item 5.  Interest in Securities of the Issuer

The Reporting  Persons may be deemed to be a part of a group (within the meaning
of Section 13(d) of the Exchange Act) that is composed of the following entities
by  virtue  of the  Shareholders'  Agreement:  (1)  General  Motors  Corporation
("General Motors"); (2) DIRECTV Enterprises, Inc. ("DIRECTV"); (3) Clear Channel
Investments,  Inc. ("Clear Channel"); (4) Motient Corporation  ("Motient");  (5)
Telcom-XM Investors, L.L.C. ("Telcom"); (6) Baron Asset Fund, Baron iOpportunity
Fund and Baron Capital Asset Fund (collectively, "Baron"); (7) Columbia XM Radio
Partners, LLC ("Columbia XM Radio"),  Columbia Capital Equity Partners III (QP),
L.P.  ("Columbia  Capital  Equity") and Columbia XM Satellite  Partners III, LLC
("Columbia XM Satellite and together with Columbia XM Radio and Columbia Capital
Equity,  "Columbia");  (8) AEA XM  Investors I LLC and AEA XM  Investors  II LLC
(collectively,  "AEA");  and (9) American Honda Motor Co., Inc.  ("Honda").  The
Reporting Persons expressly disclaim beneficial ownership of the shares of Class
A Stock of the Issuer held by the other members of the group,  and the filing of
this  Statement by the Reporting  Persons shall not be construed as an admission
by the  Reporting  Persons that they are,  for purposes of Section  13(d) of the
Exchange Act, the beneficial  owner of any of the shares of Class A Stock of the
Issuer held by the other members of the group.

Based solely upon the Available Data, the Reporting  Persons believe that, as of
August 8, 2000, the other members of the group  beneficially owned the number of
shares of Class A Stock of the Issuer set forth in the table below, constituting
in each case that  percentage of the Class A Stock of the Issuer  outstanding on
August  8,  2000 set  forth in the  table.  The  Issuer's  Series A  convertible
preferred stock is convertible  into Class A Stock on a one-for-one  basis.  The
Preferred  Stock is  convertible  into  shares  of Class A Stock at the  current
conversion price of $26.50.

Name of Beneficial Owner            Number of Shares            Percentage
------------------------            ----------------            ----------
MOTIENT                                 16,757,262                 34.3%
GM                                      11,861,221                 27.0%
DIRECTV                                  6,307,969                 16.4%
CLEAR CHANNEL                            8,329,877                 25.8%
COLUMBIA                                 3,531,343                 10.9%
TELCOM                                   2,661,211                 8.2%
AEA                                      2,264,151                 7.0%
HONDA                                    1,886,792                 5.8%
BARON                                    2,253,314                 7.0%


Except for the transactions  reported in this Statement,  the Reporting  Persons
have not engaged in any other  transactions in the Class A Stock within the past
60 days.

To the best knowledge of the Reporting  Persons,  none of the Reporting Persons'
executive  officers,  managing directors or general partners (as applicable) has
effected any transactions in the Class A Stock within the past 60 days.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and on the Available Data, the Reporting Persons
believe  that:  (1) on  October  8, 1999,  each of  General  Motors and  DIRECTV
acquired from the Issuer in a private placement 5,393,252 shares of the Issuer's
Series A convertible  preferred stock upon  conversion of $50,000,000  principal
amount (plus accrued  interest) of  convertible  subordinated  notes  previously
issued to each of General  Motors and  DIRECTV by the  Issuer,  at a  conversion
price of approximately  $9.52 per share, (2) on October 8, 1999, each of General
Motors and DIRECTV  acquired 160,000 shares of the Issuer's Class A Stock in the
Issuer's initial public offering (the "Offering"), at a purchase price of $12.00
per share,  the initial public  offering price of the Class A Stock,  and (3) on
August 8, 2000,  DIRECTV  acquired  20,000  shares of the  Preferred  Stock at a
purchase price of $1,000 per share.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, dated June 13, 2000, and on the Available Data, the Reporting Persons
believe that: (1) on October 8, 1999,  Clear Channel acquired from the Issuer in
a  private  placement  8,089,877  shares  of Class A Stock  upon  conversion  of
$75,000,000   principal   amount  (plus  accrued   interest)  of  a  convertible
subordinated  note  previously  issued  to Clear  Channel  by the  Issuer,  at a
conversion price of  approximately  $9.52 per share, and (2) on October 8, 1999,
Clear  Channel  acquired  240,000  shares of the  Issuer's  Class A Stock in the
Offering,  at a purchase price of $12.00 per share,  the initial public offering
price of the Class A Stock.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and on the Available Data, the Reporting Persons
believe  that:  (1) on  October 8, 1999,  Telcom  acquired  from the Issuer in a
private  placement  2,696,626  shares  of  Class  A  Stock  upon  conversion  of
$25,000,000 principal amount (plus accrued interest) of convertible subordinated
notes  previously  issued to  Telcom by the  Issuer,  at a  conversion  price of
approximately  $9.52 per share,  and (2) on October  8,  1999,  Telcom  acquired
80,000 shares of the Issuer's Class A Stock in the Offering, at a purchase price
of $12.00 per share, the initial public offering price of the Class A Stock.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and on the Available Data, the Reporting Persons
believe  that:  (1) on October 8, 1999  Columbia  acquired  from the Issuer in a
private  placement  2,696,626  shares  of  Class  A  Stock  upon  conversion  of
$25,000,000 principal amount (plus accrued interest) of convertible subordinated
notes  previously  issued to  Telcom by the  Issuer,  at a  conversion  price of
approximately  $9.52 per share, (2) on October 8, 1999 Columbia  acquired 80,000
shares of the Class A Stock in the Offering,  at a purchase  price of $12.00 per
share,  the initial public offering price of the Class A Stock, (3) on August 8,
2000,  Columbia  XM Radio  acquired  4,500  shares of the  Preferred  Stock at a
purchase price of $1,000 per share, (4) on August 8, 2000, Columbia XM Satellite
acquired  8,203.313  shares of the Preferred Stock at a purchase price of $1,000
per share, and (5) on August 8, 2000, Columbia Capital Equity acquired 7,296.687
acquired shares of the Preferred Stock at a purchase price of $1,000 per share.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and on the Available Data, the Reporting Persons
believe that: (1) in January 1999, Motient loaned the Issuer approximately $21.4
million,  in  exchange  for  shares of  common  stock of the  Issuer  and a note
convertible into additional shares of common stock of the Issuer, (2) on July 7,
1999, Motient acquired from XM Ventures, a trust established by Worldspace,  all
of  Worldspace's  debt and  equity  interests  in the  Issuer,  other than a $75
million loan from Worldspace to the Issuer,  in exchange for 8,614,244 shares of
Motient's common stock,  par value $.01 per share (the "Exchange  Transaction"),
(3)  immediately  after the Exchange  Transaction,  the Issuer  reorganized  its
capital  structure and the shares of common stock of the Issuer owned by Motient
were exchanged on a one-for-one  basis for shares of Class B Common Stock and as
a result,  Motient owned 125 shares of Class B Common Stock of the Issuer, which
constituted  100% of the  outstanding  Class B Common Stock,  and which were the
only shares of the Issuer's capital stock then outstanding; also as part of this
reorganization,  certain  of the  debt  interests  acquired  by  Motient  in the
Exchange  Transaction were exchanged for a single convertible note issued by the
Issuer,  convertible  into shares of the Issuer's  Class B common stock,  (4) in
September  1999, the Issuer effected a 53,514 for 1 stock split and as a result,
the 125 shares of Class B Common Stock then owned by Motient were  exchanged for
6,689,250  shares of Class B Common  Stock,  (5) on October  8,  1999,  upon the
completion of the Offering,  all of the convertible notes of the Issuer owned by
Motient converted into 11,182,926 shares of Class B Common Stock and as a result
of this  conversion,  as of October  8,  1999,  Motient  owned an  aggregate  of
17,872,176  shares of Class B Common  Stock,  (6) on October  8,  1999,  Motient
acquired  200,000  shares of the Issuer's  Class A Stock in the  Offering,  at a
purchase  price of $12.00 per share,  the initial  public  offering price of the
Class A Stock, and (7) on January 17, 2000, Motient transferred 1,314,914 shares
of the  Issuer's  Class A Stock to Baron  Asset Fund  pursuant to the terms of a
note issued by Motient to Baron Asset Fund.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and on the Available Data, the Reporting Persons
believe  that:  (1) on August 8, 2000,  AEA XM  Investors I LLC  acquired  6,869
shares of the Preferred  Stock at a purchase price of $1,000 per share,  and (2)
on August  8,  2000,  AEA XM  Investors  II LLC  acquired  53,131  shares of the
Preferred Stock at a purchase price of $1,000 per share.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and in the Available Data, the Reporting Persons
believe that on August 8, 2000,  Honda  acquired  50,000 shares of the Preferred
Stock at a purchase price of $1,000 per share.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement, filed June 13, 2000, and in the Available Data, the Reporting Persons
believe  that:  (1) on January 17,  2000,  Baron Asset Fund  acquired  1,314,914
shares of the  Issuer's  Class A Stock from  Motient  pursuant to the terms of a
note issued by Motient to Baron Asset Fund,  (2) on August 8, 2000,  Baron Asset
Fund acquired 31,000 shares of the Preferred Stock at a purchase price of $1,000
per share, (3) on August 8, 2000, Baron  iOpportunity Fund acquired 2,000 shares
of the  Preferred  Stock at a purchase  price of $1,000  per  share,  and (4) on
August 8, 2000,  Baron Capital Asset Fund acquired 2,000 shares of the Preferred
Stock at a purchase price of $1,000 per share.

The  Reporting  Persons  do not know of any  other  person  having  the right to
receive or the power to direct the receipt of  dividends  from,  or the proceeds
from the sale of, the shares of Class A Stock of the Issuer  beneficially  owned
by the Reporting Persons.


Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to
        Securities of the Issuer

Shareholders' Agreement

Governance  Provisions.  The  Issuer's  board of  directors  consists  of eleven
members,  one of whom is selected by Telcom,  one of whom is selected by General
Motors or  DIRECTV,  one of whom is selected  by Clear  Channel,  one of whom is
selected  by AEA  Investors,  five of whom  are  selected  by  Motient,  and two
independent directors,  one of whom must be approved by Motient, and one of whom
must be  approved  by a  majority  of the  other  parties  to the  Shareholders'
Agreement.  Following  receipt of approval of the FCC to transfer control of the
Issuer from Motient to a diffuse group of  shareholders,  the Issuer's  board of
directors  will consist of ten members,  one of whom will be selected by Telcom,
one of whom will be selected by General  Motors or DIRECTV,  one of whom will be
selected by Clear Channel, one of whom will be selected by AEA Investors,  three
of whom will be selected by Motient,  two  independent  directors of  recognized
industry  experience and stature whose  nominations  must be approved by Motient
and the other parties to the  Shareholders'  Agreement,  and one of whom will be
the Issuer's President and Chief Executive  Officer.  The foregoing board rights
are  subject to the parties to the  Shareholders'  Agreement  maintaining  their
original investment or certain minimum share percentages in the Issuer.

Conversion of Class B Stock to Class A Stock. The Class B Stock owned by Motient
is  convertible  into  Class A Stock,  on a  one-for-one  basis,  at any time at
Motient's  discretion.  In  addition,  under the  Shareholders'  Agreement,  the
holders of a majority  of the  outstanding  shares of Class A Stock,  which must
include at least 20% of the public  holders  of the Class A Stock,  may  require
conversion by Motient. This conversion will not be effected, however, if the FCC
does not approve the transfer of control of the Issuer from Motient to a diffuse
group of shareholders.

Non-Competition.  Motient  has  agreed  not to  compete  with the  Issuer in the
satellite radio business in the United States for so long as Motient holds 5% of
the Issuer's common stock and for a period of three years following any transfer
which results in Motient owning less than 5% of the Issuer's common stock.

Registration Rights Agreement

In addition to the contracts and agreements described above and in Item 4 above,
MDCP, MDSE and Special Advisors have certain registration rights with respect to
the  Securities,  pursuant  to  an  amended  and  restated  registration  rights
agreement, dated as of August 8, 2000 (the "Registration Rights Agreement"),  by
and  among the  Issuer,  MDCP,  MDSE and  Special  Advisors  and  certain  other
stockholders named therein.  Commencing July 7, 2000, certain  stockholders that
are  party  to  the  Registration   Rights  Agreement  are  entitled  to  demand
registration with respect to their Class A Stock, including shares issuable upon
conversion  of other  securities.  The Series C investors  receive  their demand
right  beginning  on August 9, 2000.  These  rights are subject to the  Issuer's
right to defer the timing of a demand registration and an underwriters' right to
cut back shares in an underwritten offering. In addition to these demand rights,
following  the Issuer's  commencement  of commercial  operation,  parties to the
Registration Rights Agreement holding,  in the aggregate,  the shares of Class A
Stock having a fair market value of not less than  $25,000,000,  may request the
Issuer to file a  registration  statement  pursuant  to Rule 415.  The  Series C
investors also have a right to demand  registration  upon a change of control of
the Company.  Parties to the  Registration  Rights Agreement also have rights to
include  their Class A Stock in  registered  offerings  initiated by the Issuer,
other than an offering for high yield debt.


Item 7            Material to be Filed as Exhibits

Exhibit 1. Amended and Restated Shareholders'  Agreement,  dated as of August 8,
2000, by and among XM Satellite Radio Holdings Inc., Motient Corporation,  Baron
Asset Fund,  Baron  iOpportunity  Fund,  Baron Capital Asset Fund, Clear Channel
Investments,  Inc.,  Columbia XM Radio Partners,  LLC,  Columbia  Capital Equity
Partners  III (QP),  L.P.,  Columbia XM Satellite  Partners  III,  LLC,  DIRECTV
Enterprises,  Inc., General Motors  Corporation,  MDCP, Special Advisors,  MDSE,
American Honda Motor Co., Inc. and Telcom-XM Investors,  L.L.C. (incorporated by
reference to the  Issuer's to Exhibit  10.1 to  Amendment  No. 1 to the Issuer's
Registration Statement on Form S-1 (File No. 333-39176)).

Exhibit 2.  Amended and  Restated  Registration  Rights  Agreement,  dated as of
August  8,  2000,  by and  among  XM  Satellite  Radio  Holdings  Inc.,  Motient
Corporation,  Baron Asset Fund,  Baron  iOpportunity  Fund,  Baron Capital Asset
Fund, Clear Channel Investments, Inc., Columbia XM Radio Partners, LLC, Columbia
Capital Equity Partners III (QP), L.P., Columbia XM Satellite Partners III, LLC,
DIRECTV Enterprises,  Inc., General Motors Corporation,  MDCP, Special Advisors,
MDSE,   American  Honda  Motor  Co.,  Inc.  and  Telcom-XM   Investors,   L.L.C.
(incorporated by reference to the Issuer's to Exhibit 10.2 to Amendment No. 1 to
the Issuer's Registration Statement on Form S-1 (File No. 333-39176)).

<PAGE>

                                   SIGNATURES

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this Statement is true, complete and correct.

Date:   August 8, 2000

Date:   August 8, 2000             MADISON DEARBORN CAPITAL PARTNERS III, L.P.

                                   By Madison Dearborn Partners III, L.P.,
                                       its General Partner

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner


                                   By:  /s/ Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director

Date:   August 8, 2000             MADISON DEARBORN SPECIAL EQUITY III, L.P.

                                   By Madison Dearborn Partners III, L.P.,
                                       its General Partner

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner


                                   By:  /s/  Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:  August 8, 2000              SPECIAL ADVISORS FUND I, LLC

                                   By Madison Dearborn Partners III, L.P.,
                                       its Manager

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:   August 8, 2000             MADISON DEARBORN PARTNERS III, L.P.

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:   August 8, 2000             MADISON DEARBORN PARTNERS, LLC


                                   By:  /s/  Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director


<PAGE>
                                  Exhibit Index

Exhibit
1.       Joint filing agreement attached following this page

2.       Amended and  Restated  Shareholders  Agreement  between and among MDCP,
         MDSE,  Special  Advisors,  the Issuer  and  certain  other  significant
         stockholders  of the  Issuer  is  incorporated  by  reference  from the
         Issuer's  registration  statement  filed on a form  S-1/A on August 17,
         2000.

3.       Amended and Restated  Registration  Rights Agreement  between and among
         MDCP, MDSE, Special Advisors,  the Issuer and certain other significant
         stockholders  of the  Issuer  is  incorporated  by  reference  from the
         Issuer's Registration Statement filed on form S-1/A on August 17, 2000.

<PAGE>

                                     EXHIBIT

In accordance with Rule 13d-1(k)  promulgated under the Securities  Exchange Act
of 1934,  the  undersigned  agree to the joint filing of a Statement on Schedule
13D  (including  any and all  amendments  thereto) with respect to the shares of
Class A Stock, $.01 par value, of XM Satellite Radio Holdings, Inc., and further
agree that this Joint  Filing  Agreement be included as an Exhibit  thereto.  In
addition,  each party to this Agreement expressly authorizes each other party to
this Agreement to file on its behalf any and all amendments to such Statement.

Date:      August 8, 2000

Date:      August 8, 2000          MADISON DEARBORN CAPITAL PARTNERS III, L.P.

                                   By Madison Dearborn Partners III, L.P.,
                                       its General Partner

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                        ----------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:   August 8, 2000             MADISON DEARBORN SPECIAL EQUITY III, L.P.

                                   By Madison Dearborn Partners III, L.P.,
                                       its General Partner

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                         ---------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:   August 8, 2000             SPECIAL ADVISORS FUND I, LLC

                                   By Madison Dearborn Partners III, L.P.,
                                       its Manager

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                         ---------------------------------------
                                        Paul J. Finnegan, its Managing Director


Date:   August 8, 2000             MADISON DEARBORN PARTNERS III, L.P.

                                   By Madison Dearborn Partners, LLC,
                                       its General Partner

                                   By:  /s/  Paul J. Finnegan
                                         ---------------------------------------
                                        Paul J. Finnegan, its Managing Director

Date:   August 8, 2000             MADISON DEARBORN PARTNERS, LLC


                                   By:  /s/  Paul J. Finnegan
                                         ---------------------------------------
                                        Paul J. Finnegan, its Managing Director



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