MOTIENT CORP
SC 13D/A, 2000-08-18
COMMUNICATIONS SERVICES, NEC
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*

                        XM Satellite Radio Holdings Inc.
                                (Name of Issuer)

                 Class A Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                                  983759 10 1
                                 (CUSIP Number)

           Randy S. Segal, Senior Vice President and General Counsel
        Motient Corporation, 10802 Parkridge Boulevard, Reston, VA 20191
            (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 ss.ss. 240.13d-1(e),  240.13(d)-1(f) or 240.13d-1(g),  check
the following box 9.

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule,  including all  exhibits.  See ss. 240.13d-7 for other
parties to whom copies are to be sent.

*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 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

Potential persons who are to respond to the collection of information  contained
in this form are not  required to respond  unless the form  displays a currently
valid OMB control number.



<PAGE>


                                  SCHEDULE 13D
<TABLE>
<CAPTION>

--------------------------------------------------------------------------------
CUSIP No.  983759 10 1                              13D Amendment No. 2 - Page 2
--------------------------------------------------------------------------------

<S>        <C>



1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Motient Corporation
           93-0976127
--------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) |_|
                                                                         (b) |_|
--------------------------------------------------------------------------------

3          SEC USE ONLY
--------------------------------------------------------------------------------
4          SOURCE OF FUNDS           WC, 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
--------------------------------------------------------------------------------
                           7            SOLE VOTING POWER:       16,757,262
        NUMBER OF
          SHARES        --------------------------------------------------------
       BENEFICIALLY
         OWNED BY          8            SHARED VOTING POWER:              0
           EACH
        REPORTING       --------------------------------------------------------
          PERSON
           WITH            9            SOLE DISPOSITIVE POWER:  16,757,262

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

                          10            SHARED DISPOSITIVE POWER:         0
                        --------------------------------------------------------
11
           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           16,757,262
--------------------------------------------------------------------------------

12         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
--------------------------------------------------------------------------------

13         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           34.3%
--------------------------------------------------------------------------------

14         TYPE OF REPORTING PERSON*
           CO
--------------------------------------------------------------------------------
</TABLE>
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF TEH SCHEDULE, AND THE SIGNATURE ATTESTATION.


<PAGE>
                             AMENDED SCHEDULE 13D1


Item 5.         Interest in Securities of the Issuer


Item 5 is amended and restated in its entirety as follows:

Based on information  provided to Motient by the Issuer (the "Available  Data"),
there were 32,312,358  shares of Class A common stock,  per value $0.1 per share
(the "Class A Stock") of the Issuer outstanding on August 8, 2000.

As of August 8,  2000,  Motient  beneficially  owned  200,000  shares of Class A
Stock,  which represents  approximately  0.62% of the Class A Stock outstanding.
Subject to the  restrictions and agreements  described in Item 4 above,  Motient
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.

Motient also  beneficially  owns 16,557,262  shares of Class B common stock, par
value $.01 per share (the "Class B Stock") of the Issuer.  The Issuer's  Class B
Stock is convertible into Class A Stock on a one-for-one basis. Class B Stock is
entitled  to three  votes for each  share,  and Class A Stock is entitled to one
vote per share. Because the Class B Stock is currently  convertible into Class A
Stock,   under  Rule  13d-3  under  the  Exchange  Act,  Motient  is  deemed  to
beneficially  own the  shares  of  Class  A  Stock  that  can be  acquired  upon
conversion  of the Class B Stock.  Subject to the  restrictions  and  agreements
described in Item 4 above,  Motient 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.

On a fully converted basis, as of the date of this Statement,  Motient is deemed
to beneficially  own an aggregate of 16,757,262  shares of Class A Stock,  which
represents  approximately  34.3% of the Issuer's Class A Stock outstanding after
issuance of the 16,557,262  shares of Class A Stock upon conversion of the Class
B Stock owned by Motient.


As  described  above in Item 4,  all of the  shares  of  Class B Stock  owned by
Motient,  and all of the 200,000  shares of Class A Stock owned by Motient,  are
pledged  to  Motient's  bank  lenders  and  guarantors,   to  secure   Motient's
obligations under its term and revolving credit facilities.
----------
1 Amending the Amended and Restated Schedule 13D dated October 18, 1999
<PAGE>

To the best  knowledge of Motient,  only the  following  executive  officers and
directors of Motient beneficially own shares of Class A Stock of the Issuer:

<TABLE>
<S>                                                            <C>
         Dennis W. Matheson                                    700 shares
         Billy J. Parrott                                    6,000 shares
         Gary M. Parsons                                   190,258 shares
         Walter V. Purnell, Jr.                             10,000 shares
         Andrew A. Quartner                                 15,000 shares
         Randy S. Segal                                     26,757 shares
         Jack A. Shaw                                       26,757 shares
         W. Bartlett Snell                                     665 shares

</TABLE>

In each case,  the number of shares of Class A Stock owned by the persons listed
above  constitutes less than 1% of the outstanding  Class A Stock of the Issuer.
Of the shares set forth above, all such shares are  beneficially  owned directly
or indirectly by the persons named,  except that all of the shares indicated for
each of Ms.  Segal and Mr.  Shaw,  and 160,542 of the shares  indicated  for Mr.
Parsons,  represent shares of Class A Stock which such persons have the right to
acquire  pursuant  to options  which are  exercisable  currently,  10,000 of the
shares of Class A Stock  indicated for Mr. Parsons are owned by his wife and for
which Mr. Parsons disclaims beneficial ownership,  and 45 of the shares of Class
A Stock indicated for Mr. Snell are held in trust for the benefit of Mr. Snell's
child and for which Mr. Snell disclaims beneficial ownership.  In addition,  the
shares  indicated for Mr.  Parsons do not include 5,393 shares held in trust for
which  Mr.  Parson's  wife  is  trustee  and for  which  Mr.  Parsons  disclaims
beneficial  ownership.  Except  as set forth  above,  to the best  knowledge  of
Motient,  no  executive  officer or  director of Motient  beneficially  owns any
shares of Class A Stock of the Issuer or has the right to acquire  such  shares.
Motient expressly disclaims  beneficial ownership of the shares of Class A Stock
shown as owned by the persons identified in the above table.


Motient  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) Columbia XM Radio Partners, LLC
("Columbia  XM  Radio"),   Columbia  Capital  Equity  Partners  III  (QP),  L.P.
("Columbia  Capital   Equity")and   Columbia  XM  Satellite  Partners  III,  LLC
("Columbia XM Satellite and together with Columbia XM Radio and Columbia Capital
Equity,  "Columbia");  (9) AEA XM  Investors I LLC and AEA XM  Investors  II LLC
(collectively,  "AEA");  and  (10) American  Honda  Motor Co.,  Inc.  ("Honda").
Motient expressly disclaims  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 Motient  shall not be construed as an admission by Motient that it
is, 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,  Motient  believes  that, as of August 8,
2000, the 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 Issuer's  Series C
Preferred  Stock is  convertible  into  shares  of Class A Stock at the  current
conversion price of $26.50.

<TABLE>
<S>                               <C>                             <C>

Name of Beneficial Owner          Number of Shares                Percentage

Motient                              16,757,262                      34.3%
General Motors                       11,861,221                      27.0%
Clear Channel                         8,329,877                      25.8%
DIRECTV                               6,307,969                      16.4%
Madison Dearborn                      4,663,418                      14.4%
Columbia                              3,531,343                      10.9%
Telcom                                2,661,211                       8.2%
AEA                                   2,264,151                       7.0%
Baron                                 2,253,314                       7.0%
Honda                                 1,886,792                       5.8%

</TABLE>

Except for the transactions reported in this Statement,  Motient has not engaged
in any other transactions in the Issuer's Class A Stock within the past 60 days.

Motient has reported the following  transactions:  (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 Stock and as a result,  Motient  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 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 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 Motient
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  Motient  converted  into  11,182,926  shares of Class B 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 Stock,  (6) on October 8, 1999,  Motient  acquired
200,000  shares of the  Issuer's  Class A Stock in the  Offering,  at a purchase
price of $12.00 per share,  the  initial  public  offering  price of the Class A
Stock, and (7) on January 17, 2000, Motient transferred  1,314,914 shares of the
Issuer's  Class A Stock to Baron  Asset  Fund  pursuant  to the  terms of a note
issued by Motient to Baron Asset Fund.

Based  solely  upon  the  information  set  forth in the  Issuer's  Registration
Statement,  filed June 13, 2000,  and on the Available  Data,  Motient  believes
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  Issuer's  Series C
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,  Motient  believes
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,  Motient  believes
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,  Motient  believes
that:  (1) on  October 8, 1999  Columbia  acquired  from the Issuer in a private
placement  2,696,626  shares of Class A Stock  upon  conversion  of  $25,000,000
principal  amount (plus  accrued  interest) of  convertible  subordinated  notes
previously   issued  to  Telcom  by  the  Issuer,   at  a  conversion  price  of
approximately  $9.52 per share,  (2) on October 8, 1999 Columbia acquired 80,000
shares of the 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, (3) on
August 8, 2000, Columbia XM Radio acquired 4,500 shares of the Issuer's Series C
Preferred Stock at a purchase price of $1,000 per share,  (4) on August 8, 2000,
Columbia  XM  Satellite  acquired  8,203.313  shares  of the  Issuer's  Series C
Preferred  Stock at a purchase  price of $1,000 per share,  and (5) on August 8,
2000,  Columbia Capita Equity acquired 7,296.687 acquired shares of the Issuer's
Series C 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,  Motient  believes
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,  (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 and  (3) on  August 8, 2000,  M-D  Capital  Partners  acquired
48,914 shares of the Issuer's  Series C 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,  Motient  believes
that:  (1) 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 and (2) on  August 8, 2000,  M-D  Special  Equity
acquired  1,086  shares of the Issuer's  Series C 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, Motient believes 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 in the Available  Data,  Motient  believes
that: (1) on August 8, 2000, AEA XM Investors I LLC acquired 6,869 shares of the
Issuer's Series C 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
Issuer's Series C 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, Motient believes that
on August 8,  2000,  Honda  acquired  50,000  shares  of the  Issuer's  Series C
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,  Motient  believes
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 Issuer's  Series C 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 Issuer's  Series C 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 Issuer's  Series C Preferred  Stock at a purchase  price of $1,000
per share.

Motient is not aware of any other transactions in shares of Class A Stock of the
Issuer  that were  effected  within the past 60 days by any of  General  Motors,
DIRECTV, Clear Channel, Columbia, Telcom, Madison Dearborn, AEA, Honda or Baron.

Motient  does 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 Motient.


<PAGE>

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 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.

Restrictions on Transfer of Securities. As described in Item 4 above, except for
affiliated  transactions,  Motient may not  transfer any of its Class A Stock or
Class  B Stock  until  the  earlier  of the  date on  which  the  Issuer  begins
commercial  operations,  or  October  8,  2000.  Shares  of  Class B  Stock  are
transferable only upon conversion into shares of Class A Stock.

Registratiion Rights Agreement

In addition to the contracts and agreements described above and in Item 4 above,
Motient 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, Motient 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.


<PAGE>

Item 7.  Material to be Filed as Exhibits

Exhibit 1. Amended and Restated Shareholders'  Agreement,  dated as of August 8,
2000, by and among XM Satellite Radio Holdings Inc., Motient Corporation,  Baron
Asset Fund,  Baron  iOpportunity  Fund,  Baron Capital Asset Fund, Clear Channel
Investments,  Inc.,  Columbia XM Radio Partners,  LLC,  Columbia  Capital Equity
Partners  III (QP),  L.P.,  Columbia XM Satellite  Partners  III,  LLC,  DIRECTV
Enterprises, Inc., General Motors Corporation, 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 XM Radio Partners, LLC, Columbia
Capital Equity Partners III (QP), L.P., Columbia XM Satellite Partners III, LLC,
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>

                                   SIGNATURE


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.

                                MOTIENT CORPORATION




                                By: /s/ Randy S. Segal
                                    -------------------------
                                Name:    Randy S. Segal
                                Title:   Senior Vice President and
                                             General Counsel

Date:    August 18, 2000

<PAGE>




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