XM SATELLITE RADIO HOLDINGS INC
SC 13D, 1999-10-18
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)

                             Nicholas S. Hodge, 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)

                                 October 8, 1999
             (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>
                                  Page 2 of 20


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            2,776,626

Owned By           8    Shared Voting Power
Each
Reporting                    -0-

Person With        9    Sole Dispositive Power

                        2,776,626

                  10    Shared Dispositive Power

                             -0-

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626

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

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

10.60%

14.  Type of Reporting Person

CO



<PAGE>
                                  Page 3 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

CO


<PAGE>
                                  Page 4 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

PN



<PAGE>
                                  Page 5 of 20

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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

PN

<PAGE>
                                  Page 6 of 20


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            2,776,626

Owned By           8    Shared Voting Power
Each
Reporting                    -0-

Person With        9    Sole Dispositive Power

                        2,776,626

                  10    Shared Dispositive Power

                             -0-

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

PN

<PAGE>
                                  Page 7 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

CO



<PAGE>
                                  Page 8 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

CO



<PAGE>
                                  Page 9 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

IN



<PAGE>
                                 Page 10 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

IN



<PAGE>
                                 Page 11 of 20


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               2,776,626

Person With        9    Sole Dispositive Power

                             -0-

                  10    Shared Dispositive Power

                        2,776,626

11.  Aggregate Amount Beneficially Owned by Each Reporting Person

2,776,626 (see Item 5)

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

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

10.60%

14.  Type of Reporting Person

IN


<PAGE>
                                 Page 12 of 20


Item 1.           Security and Issuer

     This  Statement  relates  to the Class A common  stock,  par value $.01 per
share  ("Class A  Stock"),  of XM  Satellite  Radio  Holdings  Inc.,  a Delaware
corporation (the "Issuer"). The Issuer's principal executive offices are located
at 1250 23rd Street, N.W., Washington, DC 20037-1100.  The Reporting Persons (as
defined  below) have  entered into a Joint Filing  Agreement  dated  October 18,
1999, a copy of which is attached hereto as Exhibit 4.


Item 2.           Identity and Background

     This  statement  is being  filed by  Columbia  XM Radio  Partners,  LLC,  a
Virginia  limited  liability  corporation  ("Columbia"),  its  managing  member,
Columbia  Capital,  LLC, a Delaware limited  liability  company (the "Manager"),
Columbia Capital Equity Partners II (QP),  L.P., a Delaware limited  partnership
("Columbia QP"),  Columbia  Capital Equity Partners II (Cayman),  L.P., a Cayman
Islands  limited  partnership  ("Columbia  Cayman"),   Columbia  Capital  Equity
Partners II, L.P., a Delaware limited partnership ("Columbia Equity"),  Columbia
Capital Equity Partners, L.L.C., a Delaware limited liability company ("Columbia
Equity LLC"),  Columbia Capital Investors,  L.L.C., a Delaware limited liability
company ("Columbia  Investors") and James B. Fleming, Jr., R. Philip Herget, III
and Harry F.  Hopper  III (each a  "Reporting  Person,"  and  collectively,  the
"Reporting  Persons").  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")  exercises voting and dispositive
control over the Manager. 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 was 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) 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.

     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").  As described under Item 4 below, 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, as part of the Offering.

     This  Statement  covers the  80,000  shares of Class A Stock  purchased  by
Columbia on October 8, 1999,  as well as the  2,696,626  shares of Class A Stock
owned by  Columbia as of such date (such  shares of Class A Stock are  sometimes
referred to in this Statement as the "Securities").

     Information  with  respect  to each  of the  Reporting  Persons'  executive
officers and managing  directors or general partners (as applicable),  including
name,  business  address,  present principal  occupation or employment,  and the


<PAGE>
                                 Page 13 of 20


name, principal business and address of any corporation or other organization in
which such employment is conducted, is listed on the schedule attached hereto as
Annex A, which is incorporated herein by reference.

     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 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

     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  was  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.

     Columbia  purchased 80,000 shares of Class A Stock in the Offering in order
to  demonstrate  its  commitment to the Issuer's  long-term  business  plans and
objectives,  and because  Columbia  concluded that the initial  public  offering
price of the Offering  represented  an  attractive  opportunity  to increase its
equity  position in the Issuer.  Columbia  also noted that  several of the other
significant equity  stakeholders in the Issuer elected to similarly  participate
in the Offering.

     Certain of  Columbia's  rights with respect to the Issuer are governed by a
shareholders'  agreement  dated  as of July 7,  1999 by and  among  the  Issuer,
Columbia,  and  certain  other  significant  shareholders  of  the  Issuer  (the
"Shareholders'  Agreement").  The Shareholders' Agreement is incorporated herein
by reference as Exhibit 1. Pursuant to the Shareholders'  Agreement,  one of the

<PAGE>
                                 Page 14 of 20

members of the  Issuer's  Board of Directors  was  appointed by Columbia and two
other parties to the Shareholders  Agreement.  Columbia's rights with respect to
the Securities are also governed by the TCM Group  Agreement dated as of July 7,
1999 among Columbia and certain other shareholders of the Issuer (the "TCM Group
Agreement").  The TCM Group  Agreement  is  incorporated  herein by reference as
Exhibit 2. The TCM Group Agreement provides for good faith cooperation among the
parties  thereto   regarding  the  exercise  of  registration   rights  and  the
appointment  of a member  of the  Issuer's  Board of  Directors.  Certain  other
material  provisions of the Shareholders'  Agreement and the TCM Group Agreement
are described in more detail in Item 6 below.

     There are certain  restrictions on Columbia's  ability to sell or otherwise
transfer the Securities.  Under the  Shareholders'  Agreement and as provided in
the TCM Group Agreement,  except for affiliated  transactions,  Columbia may not
     transfer any of its Class A Stock until the date which is one year from the
issuance
of the Note.

     In addition, Columbia has signed a "lock-up" agreement with Bear, Stearns &
Co. Inc.  and  Donaldson,  Lufkin & Jenrette  Securities  Corporation,  the lead
underwriters for the Offering.  Pursuant to this agreement,  Columbia has agreed
not to sell,  offer to sell,  contract to sell,  pledge,  hypothecate,  sell any
option or contract to purchase or otherwise  transfer or dispose of, directly or
indirectly,  any  shares of Class A Stock,  for a period  of 180 days  after the
effective  date  of  the  registration  statement  filed  by the  Issuer  in the
Offering.

     Except as described above 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,  and the TCM Group 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  and the TCM Group  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.

     To the best knowledge of the Reporting  Persons,  all shares  identified in
Item 5 below as beneficially owned by persons listed in Annex A were acquired by
such  persons for  investment  purposes.  Such persons may buy or sell shares of
Class A Stock in the future as they deem appropriate, but, to the best knowledge
of the Reporting Persons, and except as otherwise indicated herein, such persons
have no present plan or proposal  that relates to or would result in the actions
or events specified in clauses (a) through (j) of Item 4 of Schedule 13D.


Item 5.           Interest in Securities of the Issuer


     After giving effect to the issuance of  10,000,000  shares of Class A Stock
by the  Issuer  in the  Offering,  and  based  on  information  provided  to the
Reporting  Persons by the Issuer (the "Available  Data"),  there were 26,194,471
shares of Class A Stock of the Issuer outstanding on October 8, 1999.

     As of October 8, 1999,  each of the Reporting  Persons  beneficially  owned
2,776,626 shares of Class A Stock, which represents  approximately  10.6% of the
Class A Stock outstanding.  Subject to the restrictions and agreements described
in Item 4 above, Columbia has the sole power to vote (or to direct the vote) and
the sole  power to  dispose  (or to direct  the  disposition)  of these  shares.
Columbia acquired these shares in the Offering. As a result of the relationships
described above in Item 2, each of the Reporting  Persons  besides  Columbia has
the shared power to vote (or to direct the vote) and the shared power to dispose
(or to direct the  disposition) of the shares of Class A Stock held of record by
Columbia.


<PAGE>
                                 Page 15 of 20

     To the best  knowledge  of the  Reporting  Persons,  none of the  Reporting
Persons, nor any of their executive officers and managing directors beneficially
own shares of Class A Stock of the Issuer other than as set forth herein.

     Columbia  may be deemed to comprise a group  (within the meaning of Section
13(d)(3)  of the  Exchange  Act) with 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)  American  Mobile  Satellite  Corporation   ("American
Mobile"); (5) Telcom-XM Investors,  L.L.C. ("Telcom");  and (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").  Columbia and each of the other Reporting Persons
expressly disclaims  beneficial  ownership of the shares of Class A Stock of the
Issuer held by General Motors, DIRECTV, Clear Channel,  American Mobile, Telcom,
or Madison  Dearborn,  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 General  Motors,  DIRECTV,
Clear Channel, American Mobile, Telcom or Madison Dearborn.

     Based solely upon the Available  Data, the Reporting  Persons believe that,
as of  October  8, 1999 (the  closing  date of the  Offering),  General  Motors,
DIRECTV, Clear Channel, American, Telcom and Madison Dearborn 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 October 8, 1999 set forth in the table.

         Name of Beneficial Owner       Number of Shares        Percentage

         General Motors                 11,106,504 (1)            30.03%
         DIRECTV                         5,553,252 (2)            17.58%
         Clear Channel                   8,329,877                31.80%
         American Mobile                18,072,176 (3)            41.00%
         Telcom                          2,776,626                10.60%
         M-D Capital Partners            2,702,200                10.31%
         M-D Special Equity                 58,247                  *
         Special Advisors                   16,179                  *
         ------------------
         *  Less than 1%

(1)  Includes  10,7786,504  shares of Class A Stock issuable upon  conversion of
     Series A convertible preferred stock of the Issuer,  5,393,252 of which are
     owned by DIRECTV,  a subsidiary  of General  Motors.  The shares of Class A
     Stock issuable upon conversion of the Series A convertible  preferred stock
     were deemed to be  outstanding  for the purpose of computing the percentage
     of the Class A Stock  owned by General  Motors,  but not for the purpose of
     computing the percentage of Class A Stock owned by any other person.

(2)  Includes  5,393,252  shares of Class A Stock  issuable  upon  conversion of
     Series A convertible  preferred stock of the Issuer.  The shares of Class A
     Stock issuable upon conversion of the Series A convertible  preferred stock
     were deemed to be  outstanding  for the purpose of computing the percentage
     of the Class A Stock owned by DIRECTV, but not for the purpose of computing
     the percentage of Class A Stock owned by any other person.

(3)  Includes  17,872,176  shares of Class A Stock  issuable upon  conversion of
     American Mobile's 17,872,176 shares of Class B common stock, $.01 par value
     per share (the "Class B Stock") of the Issuer.  The shares of Class A Stock
     issuable upon conversion of the Class B Stock were deemed to be outstanding
     for the purpose of computing  the  percentage of the Class A Stock owned by
     American  Mobile,  but not for the purpose of computing  the  percentage of
     Class A Stock owned by any other person.

     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 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.

<PAGE>
                                 Page 16 of 20


     Based solely upon the  information  set forth in the  Issuer's  Prospectus,
dated October 5, 1999, 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,  and (2) on  October  8,  1999,  each of General
Motors and DIRECTV  acquired 160,000 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  Prospectus,
dated October 5, 1999, 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  Prospectus,
dated October 5, 1999, 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  Prospectus,
dated October 5, 1999, 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  2,622,200  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, and (2) on October 8, 1999, M-D Capital
Partners  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  Prospectus,
dated October 5, 1999, and on the Available Data, the Reporting  Persons believe
that on  October 8,  1999,  M-D  Special  Equity  acquired  from the Issuer in a
private  placement  58,247  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.

     Based solely upon the  information  set forth in the  Issuer's  Prospectus,
dated October 5, 1999, 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  Prospectus,
dated October 5, 1999, and on the Available Data, the Reporting  Persons believe
that: (1) in January 1999, American Mobile 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,  American  Mobile  acquired  from  XM  Ventures,  a trust  established  by
Worldspace,  all of Worldspace's debt and equity interests in the Issuer,  other

<PAGE>
                                 Page 17 of 20


than a $75 million loan from Worldspace to the Issuer, in exchange for 8,614,244
shares  of  American  Mobile'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 American Mobile were exchanged on a one-for-one basis for shares
of Class B Stock and as a result,  American  Mobile  owned 125 shares of Class B
Stock of the Issuer,  which  constituted 100% of the outstanding  Class B 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
American  Mobile  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 Stock  then  owned by
American  Mobile were  exchanged for 6,689,250  shares of Class B Stock,  (5) on
October 8, 1999,  upon the  completion of the Offering,  all of the  convertible
notes of the Issuer owned by American Mobile converted into 11,182,926 shares of
Class B Stock  and as a  result  of this  conversion,  as of  October  8,  1999,
American  Mobile owned an aggregate of 17,872,176  shares of Class B Stock,  and
(6) on October 8, 1999,  American Mobile 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.

     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
        -----------------------

     Set forth below is a  description  of certain  material  provisions  of the
Shareholders' Agreement:

     Governance  Provisions.  The Issuer's  board of directors  consists of nine
members, one of whom is selected by a majority in interest of Columbia,  Madison
Dearborn and Telcom, six of whom are selected by certain other shareholders, and
two independent directors,  one of whom must be approved by American Mobile, and
one of whom must be  approved  by a  majority  of  certain  other  shareholders.
Following  receipt of approval of the FCC to transfer control of the Issuer from
American  Mobile to a  diffuse  group of  shareholders,  the  Issuer's  board of
directors  will  consist  of nine  members,  one of whom will be  selected  by a
majority in interest of Columbia, Madison Dearborn and Telcom, five of whom will
be  selected  by certain  other  shareholders,  two of whom will be  independent
directors of recognized  industry  experience and stature whose nominations must
be  approved by American  Mobile and a majority  of certain  other  shareholders
including  Columbia,  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.

     Restrictions  on  Transfer of  Securities.  As  described  in Item 4 above,
except for  affiliated  transactions  and  certain  other  permitted  transfers,
Columbia  may not  transfer any of its Class A Stock until the date which is one
year from the issuance of the Note.


     Registration Rights Agreement
     -----------------------------

     In addition to the contracts and agreements  described  above and in Item 4
above,  Columbia has certain registration rights with respect to the Securities,
pursuant  to  a  registration   rights  agreement,   dated  July  7,  1999  (the
"Registration Rights Agreement"),  by and among the Issuer, Columbia and certain
other  stockholders  named therein.  Commencing  July 7, 2000,  Columbia and the
other  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.  Together with Telcom and
Madison-Dearborn,  Columbia is entitled  to make one  demand.  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


<PAGE>
                                 Page 18 of 20


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.  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.

     TCM Group Agreement
     -------------------

     The TCM Group  Agreement  provides that the parties thereto agree that: (1)
they will make good faith  efforts to reach a unanimous  decision  regarding the
rights granted in the Registration  Rights Agreement,  (2) they will make a good
faith effort to select one individual to be their representative on the Issuer's
Board of Directors in accordance with the Shareholders'  Agreement, and (3) that
each party may transfer or assign its Issuer  securities to affiliates  provided
that such affiliate  agrees to become a party the TCM Group Agreement and in the
event a party desires to make a transfer or assignment of its Issuer  securities
which would bring such party's  ownership in the Issuer below 6% equity interest
level (on a fully diluted and  as-converted  basis) such party shall first offer
such securities to the other parties.

     Other than the Shareholders'  Agreement,  the Registration Rights Agreement
and the TCM Group Agreement  described in Item 4 above,  there are no contracts,
arrangements, understandings, or relationships between the Reporting Persons or,
to the best of  their  knowledge,  any  executive  officer  or  director  of the
Reporting  Persons,  and any other person with respect to any  securities of the
Issuer,  including  any contract,  arrangement,  understanding  or  relationship
concerning the transfer or the voting of any securities of the Issuer,  finder's
fees, joint ventures, loan or option arrangements,  puts or calls, guarantees of
profits, division of profits or loss, or the giving or withholding of proxies.


Item 7.   Material to be Filed as Exhibits

Exhibit 1      Shareholders'  Agreement,  dated as of July 7, 1999, by and among
               the Issuer,  American Mobile Satellite  Corporation,  Baron Asset
               Fund,  Clear  Channel   Investments,   Inc.,  Columbia  XM  Radio
               Partners, LLC, DIRECTV, Inc., General Motors Corporation, Madison
               Dearborn  Capital  Partners III, L.P.,  Special  Advisors Fund I,
               LLC,  Madison  Dearborn  Special  Equity III, L.P., and Telcom-XM
               Investors,  L.L.C.  (incorporated by reference to Exhibit 99.2 to
               American  Mobile's  registration  statement on Form S-3 (File No.
               333-81459)).

Exhibit 2      Registration  Rights Agreement,  dated July 7, 1999, by and among
               the Issuer,  American  Mobile  Satellite  Corporation,  the Baron
               Asset Fund, and the holders of Series A subordinated  convertible
               notes of the  Issuer  named in such  agreement  (incorporated  by
               reference  to  Exhibit  99.3 to  American  Mobile's  registration
               statement on Form S-3 (File No. 333-81459)).

Exhibit 3      TCM Group  Agreement  dated July 7, 1999, by and among  Telcom-XM
               Investors,  L.L.C.,  Columbia  XM Radio  Partners,  LLC,  Madison
               Dearborn  Capital  Partners III, L.P.,  Madison  Dearborn Special
               Equity III, L.P. and Special Advisors Fund I, LLC.

Exhibit 4      Joint Filing Agreement set forth below.


<PAGE>
                                 Page 19 of 20





                                   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: October 18, 1999


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


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


                  COLUMBIA CAPITAL LLC


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




<PAGE>
                                 Page 20 of 20





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


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


                  COLUMBIA CAPITAL EQUITY PARTNERS LLC


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


                  COLUMBIA CAPITAL INVESTORS, L.L.C.


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


                  JAMES B. FLEMING, JR.


                  ------------------------------------------------


                  R. PHILIP HERGET, III


                  ------------------------------------------------


                  HARRY F. HOPPER


                  ------------------------------------------------




<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:    October 18, 1999


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


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


                  COLUMBIA CAPITAL LLC


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



<PAGE>


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


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


                  COLUMBIA CAPITAL EQUITY PARTNERS LLC


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


                  COLUMBIA CAPITAL INVESTORS, L.L.C.


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


                  JAMES B. FLEMING, JR.


                  ------------------------------------------------


                  R. PHILIP HERGET, III


                  ------------------------------------------------


                  HARRY F. HOPPER


                  ------------------------------------------------



<PAGE>


                                     ANNEX A

DIRECTORS OF COLUMBIA CAPITAL,  L.L.C., COLUMBIA CAPITAL EQUITY PARTNERS LLC AND
COLUMBIA CAPITAL INVESTORS, L.L.C.

                                      Present Principal
Name and Business Address             Occupation or Employment
- -------------------------             ------------------------

James B. Fleming, Jr.                 President/Managing Director of Columbia
201 N. Union Street, Suite 300               Capital, L.L.C.
Alexandria,VA 22314


R. Philip Herget, III                 Executive Vice President/Managing Director
of 201 N. Union                              Columbia Capital, L.L.C.
Street, Suite 300
Alexandria,VA 22314

Harry F. Hopper III                   Executive Vice President/Managing Director
of 201 N. Union                              Columbia Capital, L.L.C.
Street, Suite 300
Alexandria, VA 22314




<PAGE>



EXECUTIVE OFFICERS OF CAPITAL,  L.L.C., COLUMBIA CAPITAL EQUITY PARTNERS LLC AND
COLUMBIA CAPITAL INVESTORS, L.L.C.



                                      Present Principal
Name and Business Address             Occupation or Employment
- -------------------------             ------------------------

James B. Fleming, Jr.                 President/Managing Director of Columbia
201 N. Union Street, Suite 300               Capital, L.L.C.
Alexandria,VA 22314


R. Philip Herget, III                 Executive Vice President/Managing Director
of 201 N. Union                              Columbia Capital, L.L.C.
Street, Suite 300
Alexandria, VA 22314

Harry F. Hopper III                   Executive Vice President/Managing Director
of 201 N. Union                              Columbia Capital, L.L.C.
Street, Suite 300
Alexandria, VA 22314

Donald A. Doering                     Chief Financial Officer/Asst. Secretary of
201 N. Union Street, Suite 300               Columbia Capital, L.L.C.
Alexandria, VA 22314


COLUMBIA XM RADIO PARTNERS,  LLC is a member managed limited liability  company.
Columbia Capital LLC is its Managing Member.

Columbia  Capital Equity Partners LLC is the General Partner of each of COLUMBIA
CAPITAL EQUITY  PARTNERS II (QP),  L.P.,  COLUMBIA  CAPITAL  EQUITY  PARTNERS II
(CAYMAN), L.P. and COLUMBIA CAPITAL EQUITY PARTNERS II, L.P.



                                                                      Exhibit 99

                               TCM GROUP AGREEMENT



     THIS TCM GROUP  AGREEMENT (the  "Agreement")  is made this 7th day of July,
1999, by and among Telcom-XM  Investors,  L.L.C., a Delaware  limited  liability
company  ("Telcom"),  Columbia  XM  Radio  Partners,  LLC,  a  Virginia  limited
liability company  ("Columbia"),  Madison Dearborn Capital Partners III, L.P., a
Delaware  limited  partnership  ("MDCP"),  Madison  Dearborn Special Equity III,
L.P., a Delaware limited partnership  ("MDSE") and Special Advisors Fund I, LLC,
a Delaware limited liability  company ("SAFI",  and together with MDCP and MDSE,
"Madison"), each of Telcom, Columbia and Madison a "Party" and collectively, the
"Parties"  or the "TCM  Group".  For all  purposes of this TCM Group  Agreement,
Madison shall be regarded and shall collectively have the rights of one "Party".

                                 R E C I T A L S

     WHEREAS, pursuant to that certain Note Purchase Agreement, dated as of June
7, 1999,  between XM  Satellite  Radio  Holdings  Inc.,  a Delaware  corporation
("XM"),  each of the  Parties and the other  parties  named  therein  (the "Note
Purchase Agreement"),  each of the Parties has agreed to purchase certain Series
A Subordinated  Convertible  Notes ("Notes") to be issued by XM, which Notes are
convertible  into shares of the Common Stock of XM ("XM Stock" and  collectively
with the Notes, "XM Securities");

     WHEREAS,  each of the Parties  shall,  at the closing of the Note  Purchase
Agreement,  enter into a Shareholders Agreement, in a form substantially similar
to Exhibit A hereto,  by and among XM, each of the Parties and the other parties
named therein (the  "Shareholders  Agreement")  setting forth certain rights and
obligations of the TCM Group, the other purchasers of Notes and XM;

     WHEREAS,  each of the  Parties  shall  also,  at the  closing  of the  Note
Purchase  Agreement,  enter  into a  Registration  Rights  Agreement,  in a form
substantially  similar to Exhibit B hereto, by and among XM, each of the Parties
and the other  parties  named  therein  (the  "Registration  Rights  Agreement")
setting  forth  certain  rights  and  obligations  of the TCM  Group,  the other
purchasers of Notes and XM with respect to the XM Securities;

     WHEREAS, the Parties wish to set forth the procedures which will govern the
exercise  of the  rights  granted  to the TCM Group in each of the  Registration
Rights Agreement and the Shareholders Agreement;

     WHEREAS, each of the Parties has, simultaneously with the execution of this
Agreement, entered into the Limited Liability Company Agreement of TCM, LLC (the
"LLC  Agreement")  pursuant  to which each of the Parties has become a member of
TCM, LLC, a Delaware limited liability company (the "LLC");

     WHEREAS,  the  Parties,  as members of the LLC have  consented to the LLC's
entry into an  Operational  Assistance  Agreement  with XM (the "XM  Agreement")
pursuant to which the LLC will have a strategic  business  relationship  with XM
and shall have the right, so long as the TCM group, in the aggregate,  maintains
a  five  percent  level  of  ownership  of XM  Securities,  to  utilize  certain
"bandwidth"  (as defined in the XM  Agreement")  licensed  to XM for  commercial
purposes;

     NOW,  THEREFORE,  in  consideration  of the  terms  and  conditions  herein
contained  and for  other  good and  valuable  consideration,  the  receipt  and
sufficiency of which is hereby acknowledged, the parties agree as follows:

     1. Defined Terms.  Capitalized  terms used herein and not otherwise defined
shall  have the  respective  meanings  provided  therefor  in the Note  Purchase
Agreement,  the Shareholders Agreement or the Registration Rights Agreement,  as
applicable.

     2. Registration Rights Agreement.

          a) Actions Requiring  Majority  Approval.  The Parties shall each make
     good faith efforts to reach unanimous decisions relating to the exercise by
     the  TCM  Group  (or any of the  Parties)  of any of the  following  rights
     granted   to  the  TCM  Group  in  the   Registration   Rights   Agreement.
     Notwithstanding the immediately  preceding  sentence,  the exercise of such
     rights, in the absence of such a unanimous  decision by the Parties,  shall
     only  require the prior  written  consent of Parties  holding a majority in
     interest of XM Securities:

               (i) the exercise of the Demand  Registration  rights provided for
          in Section 2.1 of the Registration Rights Agreement; or

               (ii) except as set forth in Section 2(c) below, the taking of any
          material actions or decisions (e.g.  selection of underwriters)  under
          the Registration Rights Agreement.

          a) Expenses. Any expenses to be borne by the TCM Group pursuant to the
     Registration  Rights  Agreement  shall  be  shared  equally  by each of the
     Parties.

          b)  Discretionary  Actions.  Any Party may,  on its own and in its own
     discretion,  take  any of the  following  actions  or  exercise  any of the
     following  rights  granted  to it as a member  of the TCM  Group  under the
     Registration Rights Agreement:

               (i) register any of its  Registrable  Securities  pursuant to the
          Shelf  Registration  provisions  set  forth  in  Section  2.2  of  the
          Registration Rights Agreement; or

               (ii) register any of its Registrable  Securities  pursuant to the
          Piggyback  Registration  rights provisions set forth in Section 2.3 of
          the Registration Rights Agreement.

     3. Shareholders Agreement.

          a) XM Board Member  Selection.  The Parties shall each make good faith
     efforts to select,  by a unanimous  written  consent,  one individual to be
     their  representative on the XM Board of Directors  pursuant to Section 5.1
     of the Shareholders  Agreement (the "TCM Group Director").  Notwithstanding
     the preceding sentence,  in the absence of such a unanimous  decision,  the
     Parties  holding a majority in interest  of XM  Securities  may, by written
     consent, select the TCM Group Director.

          b) Initial  Director.  The Parties hereby select Dr. Rajendra Singh as
     the initial TCM Group Director. Removal/Successor Directors. Removal of the
     TCM Group Director and  appointment of successor TCM Group  Directors shall
     require  the  approval  of Parties  holding a majority  in  interest  of XM
     Securities.

     4.  Transfers  of XM  Securities.  In each case  subject to the  applicable
provisions of the Shareholders Agreement, each Party may transfer all or part of
its holdings of XM Securities, provided, however, that:

          a) any transfer or  assignment to an affiliate is permitted so long as
     such affiliate agrees to join this Agreement as a Party;

          b) subject to clause (a) above,  each transferee,  successor or assign
     of any XM  Securities  shall  agree to be bound by and to  comply  with the
     terms of this TCM Group  Agreement  and shall  document  such  agreement by
     executing a counterpart of this Agreement prior to such transfer  (however,
     the failure of any such  transferee to so execute this Agreement  shall not
     act as a waiver of the effects of this Section 4);

          c) in the  event  any  Party (a  "Selling  Party")  intends  to make a
     transfer or assignment  of XM Securities  which would bring the TCM Group's
     (in the aggregate)  ownership of XM Securities  below a 6% equity  interest
     level (on a fully diluted and as-converted basis) such Selling Party shall,
     prior to effecting any such transfer,  deliver or mail by certified mail or
     overnight  courier a written notice ("Right of First Offer Notice") to each
     other Party  stating its bona fide  intention  to sell,  transfer or assign
     some or all of its XM Securities (the "Offered  Securities")  and agrees to
     negotiate  in good  faith  with  each  other  Party for a period of 30 days
     following  the date of such Right of First Offer  Notice (the  "Exclusivity
     Period"),  whereby each other Party (each a "Buying  Party") shall be given
     the first  exclusive and  irrevocable  option (but not the  obligation)  to
     purchase any or all of the Offered  Securities;  provided  that if there is
     more than one Buying  Party,  no Buying  Party may  purchase  more than its
     proportionate  share  (based on the  number  (or  principal  amount)  of XM
     Securities  held by all Buying  Parties)  of the XM  Securities  so offered
     unless one or more or the other Buying Parties elects to purchase less than
     its proportionate share of the Offered Securities;

          d) if the Selling  Party does not agree to accept any offers (or there
     are not offers made with respect to all of the Offered  Securities) made by
     the Buying Parties (each and any such offer,  a "Purchase  Offer") prior to
     the expiration of the Exclusivity  Period,  the Selling Party shall,  for a
     period of 60 days from the expiration of the Exclusivity  Period (the "Sale
     Period"),  be  permitted  to sell any  Offered  Securities  not  subject an
     accepted  Purchase  Offer to a  third-party  buyer for a purchase  price or
     other  consideration not equal to or lower than the highest Purchaser Offer
     for any of the  Offered  Securities  and on terms  and  conditions  no more
     favorable  to such  third-party  buyer than those set forth in the  highest
     Purchaser Offer;

          e) if Purchase  Offers for all of the Offered  Securities are accepted
     by the Selling Party,  the sale of such Offered  Securities shall be closed
     at a time and location  mutually  acceptable  to the Selling  Party and the
     Buying  Parties,  but in no event  later than  thirty  days  following  the
     expiration of the Exclusivity Period;

          f) the Selling Party shall,  at the earliest of (x) the closing of any
     sale of Offered  Securities to a third party and (y) the  expiration of the
     Sale  Period,  sell to each Buying  Party from which it accepted a Purchase
     Offer the Offered Securities subject to such Purchase Offer;

          g) any Offered  Securities  not subject to an accepted  Purchase Offer
     and not sold to a third party or a Buying Purchaser prior to the expiration
     of the Sale Period shall become subject again to the provisions of Sections
     4(c)-(f)  hereof and any future  offer of such  Offered  Securities  or any
     other XM  Securities  held by the Selling  Party shall be made  pursuant to
     such provisions;

          h) each Party shall,  upon any  attempted  transfer or  assignment  by
     another Party of any of its holdings of XM Securities in  contravention  of
     this Agreement, have the right to take appropriate legal action, including,
     but not  limited  to  seeking  an  injunction  or the  imposition  of other
     equitable remedies, in order to enforce the terms of this Agreement.

     4.  Notices.  Notices  hereunder  shall be sent by certified  mail,  return
receipt requested, hand delivery or facsimile transmission (promptly followed by
certified mail) or overnight courier as follows:

         To:      Telcom-XM Investors, L.L.C.
                  211 N. Union Street, Suite 300
                  Alexandria, VA 22314
                  Fax:  703-706-3837
                  Attn: President and General Counsel

                  with a copy to:

                  Dewey Ballantine LLP
                  1301 Avenue of the Americas
                  New York, NY  10019
                  Fax:  212-259-6333
                  Attn: William J. Phillips, Esq.

                  To:   Columbia XM Radio Partners, LLC
                  201 North Union Street, Suite 300
                  Alexandria, VA 22314
                  Fax:  703-519-3904
                  Attn: James B. Fleming

                  with a copy to:

                  Edwards & Angell, LLP
                  101 Federal Street
                  Boston, MA 02110
                  Fax:  617-439-4170
                  Attn: Stephen O. Meredith, Esq.

          To :    Madison Dearborn Capital Partners III, L.P.
                  Madison Dearborn Special Equity III, L.P.
                  Special Advisors Fund I, LLP
                  Three First National Plaza
                  Chicago, IL 60602
                  Fax:  312-895-1225
                  Attn: James M. Perry, Jr.

                  with a copy to:

                  Edwards & Angell, LLP
                  101 Federal Street
                  Boston, MA 02110
                  Fax:  617-439-4170
                  Attn: Stephen O. Meredith, Esq.

     5. Cumulative Remedies.  The rights and remedies provided by this Agreement
are  cumulative  and the use of any one right or  remedy by any party  shall not
preclude  or waive its right to use any or all other  remedies.  Said rights and
remedies  are given in addition to any other rights the parties may have by law,
statute, ordinance or otherwise.

     6. Binding  Effect.  This Agreement  shall be binding upon and inure to the
benefit of all of the Parties and, to the extent  permitted  by this  Agreement,
their successors, legal representatives and assigns.

     7.  Interpretation.  Throughout this Agreement,  nouns,  pronouns and verbs
shall be construed as masculine, feminine, neuter, singular or plural, whichever
shall be applicable. All references herein to "Sections" and clauses shall refer
to corresponding  provisions of this Agreement  unless specified  otherwise in a
particular instance.

     8.  Severability.  The  invalidity or  unenforceability  of any  particular
provision of this Agreement shall not affect the other  provisions  hereof,  and
this  Agreement  shall  be  construed  in all  respects  as if such  invalid  or
unenforceable  provision were omitted.  If any provision of this Agreement shall
be  declared by a court of  competent  jurisdiction  to be  invalid,  illegal or
incapable  of  being  enforced  in whole or in  part,  such  provision  shall be
interpreted  so as to  remain  enforceable  to the  maximum  extent  permissible
consistent  with  applicable law and the remaining  conditions and provisions or
portions  thereof  shall  nevertheless  remain  in full  force  and  effect  and
enforceable  to the  extent  they  are  valid,  legal  and  enforceable,  and no
provisions shall be deemed dependent upon any other covenant or provision unless
so expressed herein.

     9.  Counterparts.   This  Agreement  may  be  executed  in  any  number  of
counterparts  with the same effect as if all parties  hereto had signed the same
document.  All counterparts shall be construed together and shall constitute one
instrument.

     10. Entire Agreement. This Agreement, along with the Shareholders Agreement
and the Registration  Rights  Agreement,  constitutes the entire agreement among
the parties  hereto  pertaining to the subject  matter hereof and supersedes all
prior agreements and understandings pertaining thereto.

     11.  Governing Law. This Agreement and the rights of the parties  hereunder
shall be interpreted  in accordance  with the laws of the State of New York, and
all rights and remedies shall be governed by such laws.

     12.  Amendments and Waivers. Any term of this Agreement may be amended, and
the observance of any term of this Agreement may be waived (either  generally or
in a particular  instance and either  retroactively or prospectively)  only with
the written consent of each of the Parties.

     13.  Specific  Performance.  Each Party,  in addition to being  entitled to
exercise  all rights  provided  herein or granted by law,  will be  entitled  to
specific performance of its rights under this Agreement.  Each Party agrees that
monetary  damages  would not be adequate  compensation  for any loss incurred by
reason of a breach by it of the  provisions of this  Agreement and hereby agrees
to waive the defense in any action for specific performance that a remedy at law
would be adequate.

     14.  Choice of Forum;  Jury  Trial  Waiver.  IN THE EVENT  THAT A  JUDICIAL
PROCEEDING IS NECESSARY, THE SOLE FORUM FOR RESOLVING DISPUTES ARISING OUT OF OR
RELATING TO THIS  AGREEMENT IS THE SUPREME COURT OF THE STATE OF NEW YORK IN AND
FOR THE  COUNTY OF NEW YORK OR THE  FEDERAL  COURTS  LOCATED  IN SUCH  STATE AND
COUNTY, AND RELATED APPELLATE COURTS. THE PARTIES HEREBY IRREVOCABLY  CONSENT TO
THE JURISDICTION OF SUCH COURTS AND AGREE TO SAID VENUE.

     THE PARTIES  HEREBY  IRREVOCABLY  WAIVE ALL RIGHT TO A TRIAL BY JURY IN ANY
ACTION,  PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT
OR ANY OTHER DOCUMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.



<PAGE>



     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed on the date first above written.



                                 TELCOM-XM INVESTORS, L.L.C.


                                 By:
                                    --------------------------------------------
                                     Name:
                                     Title:

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


                                 By:
                                    --------------------------------------------
                                     Name:
                                     Title:

                                 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:
                                    --------------------------------------------
                                     Name:
                                     Title:

                                 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:
                                    --------------------------------------------
                                     Name:
                                     Title:

                                 SPECIAL ADVISORS FUND I, LLC
                                 By: Madison Dearborn Partners III, L.P., its
                                        manager
                                 By: Madison Dearborn Partners LLC, its general
                                        partner


                                 By:
                                    --------------------------------------------
                                     Name:
                                     Title:


<PAGE>


                                    EXHIBIT A

                      ATTACH FORM OF SHAREHOLDERS AGREEMENT






<PAGE>


                                    EXHIBIT B

                  ATTACH FORM OF REGISTRATION RIGHTS AGREEMENT




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