XM SATELLITE RADIO HOLDINGS INC
SC 13D, 2000-08-18
COMMUNICATIONS SERVICES, NEC
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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

    Columbia XM Radio 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

    Virginia

Number of              7      Sole Voting Power
Shares
Beneficially                  2,946,437.32*

Owned By               8      Shared Voting Power
Each
Reporting                     584,905.66**

Person With            9      Sole Dispositive Power

                              2,946,437.32*

                      10      Shared Dispositive Power

                              584,905.66**

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital, L.L.C.

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                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Equity Partners II (QP), 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                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Equity Partners II (Cayman), 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

    Cayman Islands

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Equity Partners II, 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                  0

Owned By               8      Shared Voting Power
Each
Reporting                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              0

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Equity Partners, L.L.C.

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                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Investors, L.L.C.

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                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    James B. Fleming, Jr.

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

    U.S.

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     3,531,342.98***

Person With            9      Sole Dispositive Power

                              -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

14.  Type of Reporting Person

     IN


<PAGE>


CUSIP No. 983759-10-1

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

    R. Philip Herget, III

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

    U.S.

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     3,531,342.98***

Person With            9      Sole Dispositive Power

                               -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

14.  Type of Reporting Person

     IN


<PAGE>


CUSIP No. 983759-10-1

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

    Harry F. Hopper III

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

    U.S.

Number of              7      Sole Voting Power
Shares
Beneficially                  -0-

Owned By               8      Shared Voting Power
Each
Reporting                     3,531,342.98***

Person With            9      Sole Dispositive Power

                               -0-

                      10      Shared Dispositive Power

                              3,531,342.98***


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

14.  Type of Reporting Person

     IN



<PAGE>



CUSIP No. 983759-10-1

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

    Columbia XM Satellite Partners III, 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

    Virginia

Number of              7      Sole Voting Power
Shares
Beneficially                  309,558.981*****

Owned By               8      Shared Voting Power
Each
Reporting                     3,221,784******

Person With            9      Sole Dispositive Power

                              309,558.981*****

                      10      Shared Dispositive Power

                              3,221,784******


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

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

    Columbia Capital Equity Partners III (QP), 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                  275,346.679*******

Owned By               8      Shared Voting Power
Each
Reporting                     3,255,996.302********

Person With            9      Sole Dispositive Power

                              275,346.679*******

                      10      Shared Dispositive Power

                              3,255,996.302********


11.  Aggregate Amount Beneficially Owned by Each Reporting Person

     3,531,342.98***

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

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

     10.63%****

14.  Type of Reporting Person

     PN


<PAGE>

                                       Key

*        This total of shares of Class A Common  Stock $.01 par value  ("Class A
         Stock") of XM Satellite  Radio Holdings,  Inc. (the "Issuer")  includes
         the  shares of Class A Stock  which  Columbia  XM Radio  Partners,  LLC
         ("Columbia")  may acquire  upon its  conversion  of the 4,500 shares of
         8.25%  Series C  Convertible  Redeemable  Preferred  Stock  ("Preferred
         Stock") of the Issuer it purchased on August 8, 2000. At this time, the
         4,500  shares of  Preferred  Stock may be  converted  into  169,811.321
         shares of Class A Stock.

**       This  total of shares of Class A Stock  includes  the shares of Class A
         Stock of which  Columbia  may  acquire  beneficial  ownership  upon the
         conversion of the 8,203.313 shares of Preferred Stock which Columbia XM
         Satellite  Partners III, LLC  ("Columbia  III")  purchased on August 8,
         2000 and the 7,296.687 shares of Preferred Stock which Columbia Capital
         Equity Partners III (QP), L.P.  ("Columbia QP III") purchased on August
         8, 2000.  At this time,  the 15,500  shares of  Preferred  Stock may be
         converted into 584,905.66 shares of Class A Stock.

***       This  total of shares of Class A Stock  includes  the Class A Stock of
          which Columbia,  Columbia Capital,  L.L.C.  (the "Manager"),  Columbia
          Capital  Equity  Partners  II (QP),  L.P.  ("Columbia  QP"),  Columbia
          Capital  Equity  Partners  II  (Cayman),   L.P.  ("Columbia  Cayman"),
          Columbia  Capital  Equity  Partners  II,  L.P.  ("Columbia   Equity"),
          Columbia  Capital Equity  Partners,  L.L.C.  ("Columbia  Equity LLC"),
          Columbia Capital Investors,  L.L.C. ("Columbia  Investors"),  James R.
          Fleming, Jr. ("Fleming"),  R. Philip Herget, III ("Herget"),  Harry F.
          Hopper  III   ("Hopper"),   Columbia   III,   and   Columbia   QP  III
          (collectively,   the  "Reporting   Persons")  may  acquire  beneficial
          ownership upon the conversion of the 20,000 shares of Preferred  Stock
          purchased by  Columbia,  Columbia III and Columbia QP III on August 8,
          2000.  At this  time,  the  20,000  shares of  Preferred  Stock may be
          converted into 754,716.981 shares of Class A Stock.

****     This value for the  percentage  of Class A Stock owned by the Reporting
         Persons reflects the shares of Class A Stock which may be acquired upon
         conversion  of the  20,000  shares  of  Preferred  Stock  purchased  by
         Columbia,  Columbia  III and Columbia QP III as shares of Class A Stock
         owned by the Reporting  Persons and as a portion of the total number of
         shares of Class A Stock outstanding.

*****    This  total of shares of Class A Stock  includes  the shares of Class A
         Stock  which  Columbia  III may  acquire  upon  the  conversion  of the
         8,203.313  shares of Preferred  Stock which  Columbia III  purchased on
         August 8, 2000. At this time, the 8,203.313  shares of Preferred  Stock
         may be converted into 309,558.981 shares of Class A Stock.

******   This  total of shares of Class A Stock  includes  the shares of Class A
         Stock of which Columbia III may acquire  beneficial  ownership upon the
         conversion of the 11,796.687  shares of Preferred  Stock which Columbia
         and  Columbia QP III  purchased  on August 8, 2000.  At this time,  the
         11,796.687  shares of  Preferred  Stock may be  converted  into 445,158
         shares of Class A Stock.

*******  This  total of shares of Class A Stock  includes  the shares of Class A
         Stock  which  Columbia QP III may acquire  upon the  conversion  of the
         7,296.687  shares of Preferred Stock which Columbia QP III purchased on
         August 8, 2000. At this time, the 7,296.687  shares of Preferred  Stock
         may be converted into 275,346.679 shares of Class A Stock.

******** This  total of shares of Class A Stock  includes  the shares of Class A
         Stock of which  Columbia QP III may acquire  beneficial  ownership upon
         the  conversion  of the  12,703.313  shares of  Preferred  Stock  which
         Columbia and Columbia  III  purchased on August 8, 2000.  At this time,
         the  12,703.313  shares  of  Preferred  Stock  may  be  converted  into
         479,370.302 shares of Class A Stock.


<PAGE>


Item 1.  Security and Issuer

This  Statement  relates  to the  Class  A Stock  of the  Issuer.  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. This filing is to replace and supercede the previous filing made by a
segment of the  Reporting  Persons on October  18,  1999 and to be  subsequently
amended.  This new filing includes two additional  parties as Reporting Persons,
Columbia III and Columbia QP III.

Item 2.  Identity and Background

This  statement  is being  filed  by  Columbia,  a  Virginia  limited  liability
corporation,  its managing member,  the Manager,  a Delaware  limited  liability
company, Columbia QP, a Delaware limited partnership,  Columbia Cayman, a Cayman
Island's limited  partnership,  Columbia Equity, a Delaware limited partnership,
Columbia Equity LLC, a Delaware limited liability company, Columbia Investors, a
Delaware limited liability  company,  Columbia III, a Virginia limited liability
company,  Columbia QP III, a Delaware limited partnership,  Fleming,  Herget and
Hopper.  The Manager,  Columbia QP,  Columbia  Cayman,  and Columbia  Equity and
Columbia  Investors  are the members of Columbia and the Manager is the managing
member of  Columbia.  Columbia  Equity  LLC is the  general  partner  of each of
Columbia  QP,  Columbia  Cayman and  Columbia  Equity.  Pursuant  to the limited
liability company agreement of the Manager, each of Messrs.  Fleming, Herget and
Hopper (the  "Individual  Reporting  Persons")  exercise  voting and dispositive
control  over the Manager.  Columbia QP III is the  managing  member of Columbia
III. Messrs.  Fleming, Herget and Hopper are the managing members of Columbia QP
III. Pursuant to the limited liability company agreement of Columbia Equity LLC,
each of the  Individual  Reporting  Persons  exercises  voting  and  dispositive
control over Columbia  Equity LLC.  Columbia  Investors is member managed by the
Individual  Reporting  Persons  and  each of the  Individual  Reporting  Persons
exercises voting and dispositive control over Columbia Investors.

The principal  business address of each of the Reporting Persons is 201 N. Union
Street, Suite 300, Alexandria, Virginia 22314.

Columbia,  Columbia  III and  Columbia QP III were  formed (i) to acquire,  own,
hold, sell,  convert,  exchange and transfer equity interests in or indebtedness
of the Issuer,  and (ii) to conduct such other activities as may be necessary or
incidental to the foregoing.

The  Manager was formed to (i) act as the  manager of  Columbia  Capital  Equity
Partners II, L.P., and (ii) to conduct such other activities as may be necessary
or incidental to the foregoing.  Columbia Equity L.L.C. was formed to act as the
general partner of each of the  partnerships of Columbia Capital Equity Partners
II, L.P. The Individual Reporting Persons serve in various management capacities
with the Manager, Columbia Equity LLC and Columbia Investors.

Each of Columbia QP, Columbia Cayman, Columbia Equity and Columbia Investors was
formed (i) to seek income and  capital  appreciation  through  the  acquisition,
holding,  management,  supervision  and sale,  exchange,  distribution  or other
disposition of investments,  and (ii) to conduct such other activities as may be
necessary or incidental to the foregoing.

This  Statement  covers the  2,776,626  shares of Class A Stock  which  Columbia
acquired   on  October  8,  1999 and the  shares  of Class A Stock of which  the
Reporting Persons may acquire beneficial ownership upon the conversion of 20,000
shares of Preferred Stock purchased as follows: 4,500 by Columbia,  8,203.313 by
Columbia III and 7,296.687 by Columbia QP III on August 8, 2000 (such shares are
sometimes referred to in this Statement as the "Securities").  At this time, the
20,000 shares of Preferred  Stock may be converted  into  754,716.981  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.

To the best knowledge of the Reporting  Persons,  with the exception of Columbia
Cayman,  which is a Cayman  Islands  entity,  each of the Reporting  Persons and
their executive officers and managing directors are United States citizens.

Item 3.  Source and Amount of Funds or Other Consideration


Shares of Preferred Stock

Columbia  purchased  4,500 shares of  Preferred  Stock,  Columbia III  purchased
8,203.313  shares of Preferred  Stock,  and Columbia QP III purchased  7,296.687
shares of Preferred  Stock. The  consideration  paid by Columbia was $4,500,000,
the consideration paid by Columbia III was $8,203,313 and the consideration paid
by Columbia QP III was $7,296,687,  or $1,000 per share of Preferred  Stock. The
source of such consideration was the general financial holdings of the entities.

Shares of Class A Stock Acquired upon Conversion of the Note
-------------------------------------------------------------

The 2,696,626 shares of Class A Stock owned of record by Columbia as of the date
of this Statement were acquired,  prior to the consummation of the Offering, and
prior to the Issuer becoming subject to Section 12(g) of the Securities Exchange
Act of 1934, as amended (the  "Exchange  Act").  The details of the purchase and
conversion of the Note are set forth below.

Pursuant  to a Note  Purchase  Agreement  dated June 7, 1999  among the  Issuer,
Columbia and certain  other  shareholders  of the Issuer,  on July 7, 1999,  the
Issuer issued  $250,000,000  of  subordinated  convertible  notes to several new
strategic  and  financial  investors  including  Columbia,  and the Issuer  used
$75,000,000  of the  proceeds  from these  notes to repay the  outstanding  loan
payable to Worldspace, Inc., a Maryland corporation ("Worldspace").  Pursuant to
this Agreement, Columbia purchased the Note for a purchase price of $25,000,000.

On October 8, 1999, upon the completion of the Offering, the Note converted into
2,696,626 shares of Class A Stock. As a result of this conversion, as of October
8, 1999, Columbia owned an aggregate of 2,696,626 shares of Class A Stock.

Shares of Class A Stock Purchased in the Offering
--------------------------------------------------

Columbia purchased 80,000 shares of Class A Stock of the Issuer in the Offering.
The consideration paid by Columbia was $960,000,  or $12.00 per share, which was
the  initial  public  offering  price  in  the  Offering.  The  source  of  such
consideration  was cash on  hand.  As a result  of the  shares  of Class A Stock
received upon  conversion of the Note and the shares of Class A Stock  purchased
in the offering,  on October 8, 1999,  Columbia  owned an aggregate of 2,776,626
shares of Class A Stock.


Item 4.  Purpose of Transaction

Columbia acquired  2,776,626 shares of Class A Stock and Columbia,  Columbia III
and  Columbia QP III  purchased  20,000  shares of  Preferred  Stock in order to
demonstrate  their  commitment  to the  Issuer's  long-term  business  plans and
objectives.

Prior to October 8, 1999, Columbia owned a Subordinated  Convertible Note in the
amount of $25,000,000 issued and payable by the Issuer (the "Note").  On October
8, 1999, the Issuer completed an initial public offering of 10,000,000 shares of
Class A Stock  (the  "Offering").  Upon  completion  of the  Offering,  the Note
converted  into  2,696,626  shares  of  Class  A  Stock.  As a  result  of  this
conversion,  as of October 8, 1999,  Columbia owned 2,696,626  shares of Class A
Stock of the Issuer. In addition to the Class A Stock described above,  Columbia
purchased  80,000  shares of Class A Stock on  October 8,  1999.  The  2,696,626
shares of Class A Stock owned by Columbia as a result of the  conversion  of the
Note as of the date of this Statement were acquired for $25,000,000,  on July 7,
1999,  prior to the  consummation  of the  Offering,  and  prior  to the  Issuer
becoming subject to Section 12(g) of the Exchange Act.

Certain of Columbia's,  Columbia III's and Columbia QP III's rights with respect
to the Issuer are  governed by an amended and restated  shareholders'  agreement
(the  "Shareholders  Agreement")  dated as of August 8, 2000.  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.  Subject  to the
restrictions under the Shareholders'  Agreement, the Reporting Persons intend to
vote their shares as they deem  appropriate  from time to time.  In  determining
from time to time  whether to sell their  shares of the  Issuer's  Class A 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) Madison Dearborn Capital Partners
III, L.P. ("M-D Capital  Partners"),  Madison  Dearborn Special Equity III, L.P.
("M-D Special Equity"), and Special Advisors Fund I, L.L.C. ("Special Advisors,"
and,  together  with M-D  Capital  Partners  and M-D  Special  Equity,  "Madison
Dearborn");  (7) Baron Asset Fund,  Baron  iOpportunity  Fund and Baron  Capital
Asset  Fund  (collectively,  "Baron");  (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%
MADISON DEARBORN                   4,663,418                    14.4%
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 Issuer's 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,  M-D Capital  Partners  acquired from the
Issuer in a private placement  2,622,222 shares of Class A Stock upon conversion
of  $24,310,000   principal  amount  (plus  accrued   interest)  of  convertible
subordinated notes previously issued to M-D Capital Partners by the Issuer, at a
conversion price of  approximately  $9.52 per share, (2) on October 8, 1999, M-D
Capital  Partners  acquired  78,262 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 (3) on August 8,  2000,  M-D  Capital  Partners
acquired  48,914 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) on October 8, 1999,  M-D Special  Equity  acquired  from the
Issuer in a private  placement 58,225 shares of Class A Stock upon conversion of
$540,000  principal amount (plus accrued  interest) of convertible  subordinated
notes  previously  issued to M-D Special  Equity by the Issuer,  at a conversion
price of approximately $9.52 per share (2) on October 8, 1999 M-D Special Equity
acquired  1,738  shares of the  Issuer's  Class A Stock at a  purchase  price of
$12.00 per share,  the initial public offering pirce of Class A Stock and (3) on
August 8, 2000, M-D Special Equity  acquired 1,086 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 on October 8, 1999,  Special Advisors acquired from the Issuer in a
private  placement  16,179  shares of Class A Stock upon  conversion of $150,000
principal  amount (plus  accrued  interest) of  convertible  subordinated  notes
previously  issued to Special  Advisors by the Issuer,  at a conversion price of
approximately $9.52 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 in 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,
Columbia,  Columbia III and Columbia QP III has 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,  Columbia,  Columbia III, Columbia QP III
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, Columbia QP III, Columbia III, DIRECTV Enterprises,
Inc., General Motors  Corporation,  Madison Dearborn Capital Partners III, L.P.,
Special  Advisors  Fund I, LLC,  Madison  Dearborn  Special  Equity  III,  L.P.,
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, Columbia QP III, Columbia III,
DIRECTV Enterprises, Inc., General Motors Corporation,  Madison Dearborn Capital
Partners III,  L.P.,  Special  Advisors Fund I, LLC,  Madison  Dearborn  Special
Equity III, L.P., 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

                                       COLUMBIA XM RADIO PARTNERS, LLC
                                       By: Columbia Capital LLC,
                                            its Managing Member


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL LLC


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL EQUITY PARTNERS II
                                        (QP), L.P.
                                       By: Columbia Capital Equity Partners LLC,
                                            its Managing Member

                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:    James B. Fleming, Jr.
                                       Title:   Managing Member


                                       COLUMBIA CAPITAL EQUITY PARTNERS II
                                        (CAYMAN), L.P.
                                       By: Columbia Capital Equity Partners LLC,
                                            its Managing Member


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL EQUITY PARTNERS II, L.P.
                                       By: Columbia Capital Equity Partners LLC,
                                            its Managing Member

                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL EQUITY PARTNERS LLC


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL INVESTORS, L.L.C.


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA XM SATELLITE PARTNERS III, LLC
                                       By, Columbia Capital Equity Partners III
                                            (QP), L.P.


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                       COLUMBIA CAPITAL EQUITY PARTNERS III
                                        (QP), L.P.


                                       By: /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                       Name:   James B. Fleming, Jr.
                                       Title:  Managing Member


                                           /s/ James B. Fleming, Jr.
                                           -------------------------------------
                                               JAMES B. FLEMING, JR.


                                           /s/ R. Philip Herget, III
                                           -------------------------------------
                                               R. PHILIP HERGET, III


                                           /s/ Harry F. Hopper III
                                           -------------------------------------
                                               HARRY F. HOPPER III


<PAGE>
                                  Exhibit Index

Exhibit
1.       Joint filing agreement attached following this page

2.       Amended and Restated Shareholders Agreement between and among Columbia,
         Columbia QP III, Columbia III, 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
         Columbia,  Columbia QP III,  Columbia III, 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 Common 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

                                  COLUMBIA XM RADIO PARTNERS, LLC
                                  By: Columbia Capital LLC, its Managing Member


                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                      COLUMBIA CAPITAL LLC

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL EQUITY PARTNERS II
                                   (QP), L.P.
                                  By: Columbia Capital Equity Partners LLC,
                                       its Managing Member

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL EQUITY PARTNERS II
                                   (CAYMAN), L.P.
                                  By: Columbia Capital Equity Partners LLC,
                                       its Managing Member

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL EQUITY PARTNERS II, L.P.
                                  By: Columbia Capital Equity Partners LLC,
                                      its Managing Member

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL EQUITY PARTNERS LLC

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL INVESTORS, L.L.C.

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA XM SATELLITE PARTNERS III, LLC
                                  By, Columbia Capital Equity Partners III
                                       (QP), L.P.

                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  COLUMBIA CAPITAL EQUITY PARTNERS III
                                   (QP), L.P.


                                  By: /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                  Name:   James B. Fleming, Jr.
                                  Title:  Managing Member


                                  /s/ James B. Fleming, Jr.
                                      -------------------------------------
                                      JAMES B. FLEMING, JR.


                                  /s/ R. Philip Herget, III.
                                      -------------------------------------
                                      R. PHILIP HERGET, III


                                  /s/ Harry F. Hopper III
                                      -------------------------------------
                                      HARRY F. HOPPER III



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