AMERICAN MOBILE SATELLITE CORP
SC 13D/A, 1999-12-20
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. 9)*

                      American Mobile Satellite Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock $.01 Par Value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   02755R 10 3
              ----------------------------------------------------
                                 (CUSIP Number)

    Ms. Chan Su Shan, Company Secretary, Singapore Telecommunications Limited
       31 Exeter Road, Comcentre, Singapore 239732, Republic of Singapore
                             (011) (65) 838-2201 */
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                December 9, 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 [ ].

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) 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).

*/       With a copy to: Richard S. Elliott, Esq., Paul, Weiss, Rifkind, Wharton
         & Garrison, 1615 L Street, N.W., Suite 1300, Washington, DC  20036,
         (202) 223-7324.
<PAGE>

                                  SCHEDULE 13D

CUSIP No.  02755R 10 3                                        Page 2 of    Pages
         -----------------

1       NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Singapore Telecommunications Limited

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a) [ ]
                                                                         (b) [X]

3       SEC USE ONLY


4       SOURCE OF FUNDS

        WC

5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]

6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Republic of Singapore

                          7        SOLE VOTING POWER

       NUMBER OF                   3,057,595 shares
         SHARES
   BENEFICIALLY OWNED     8        SHARED VOTING POWER
    BY EACH REPORTING
         PERSON                    0 shares
          WITH
                          9        SOLE DISPOSITIVE POWER

                                   3,057,595 shares

                          10       SHARED DISPOSITIVE POWER

                                   0 shares

11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        3,057,595 shares

12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                       [X]

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

        6.2%

14      TYPE OF REPORTING PERSON

        CO
<PAGE>

                                  SCHEDULE 13D

CUSIP No.  02755R 10 3                                        Page 3 of    Pages
         -----------------

1       NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Temasek Holdings (Private) Limited

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a) [ ]
                                                                         (b) [X]

3       SEC USE ONLY


4       SOURCE OF FUNDS

        AF

5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) or 2(e)                                       [ ]

6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Republic of Singapore

                          7        SOLE VOTING POWER

       NUMBER OF                   0 shares
         SHARES
   BENEFICIALLY OWNED     8        SHARED VOTING POWER
    BY EACH REPORTING
         PERSON                    3,057,595 shares
          WITH
                          9        SOLE DISPOSITIVE POWER

                                   0 shares

                          10       SHARED DISPOSITIVE POWER

                                   3,057,595 shares

11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        3,057,595 shares

12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                       [X]

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

        6.2%

14      TYPE OF REPORTING PERSON

        HC
<PAGE>

                                                                               4

                             AMENDED SCHEDULE 13D 1/

Item 5.  Interest in Securities of the Issuer

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

(a) Singapore Telecom owns beneficially 3,057,595 shares of Common Stock. Of
this amount, 2,229,314 shares of Common Stock are owned of record by Singapore
Telecom, and 828,281 shares of Common Stock could be obtained by Singapore
Telecom upon exercise in full of the Amended Warrant and Warrant No. 2. As noted
in Item 2 above, Singapore Telecom is approximately 80% owned by Temasek. The
filing of this Statement should not, however, be construed as an admission that
Temasek is, for purposes of Section 13(d) of the Act, the beneficial owner of
any of the Common Stock beneficially owned by Singapore Telecom.

         Based upon the information supplied by the Issuer, the 3,057,595 shares
of Common Stock beneficially owned by Singapore Telecom constitute approximately
6.2% of the Common Stock outstanding as of November 30, 1999. 2/

         To the best knowledge of the Reporting Persons, none of the persons
listed in Schedule I or II beneficially own or have the right to acquire shares
of Common Stock.

         The Reporting Persons may be deemed to comprise a group (within the
meaning of Section 13(d)(3) of the Act) with the following entities by virtue of
certain agreements described in Item 6 below: (1) Hughes Electronics Corporation
("Hughes Electronics") and Hughes Communications Satellite Services, Inc.
("Hughes" and, together with Hughes Electronics, the "Hughes Entities"), an
indirect wholly-owned subsidiary of Hughes Electronics; and (2) Space
Technologies Investments, Inc. ("Investments") and the following affiliates of
Investments: Transit Communications, Inc. and Satellite Communications
Investments Corporation (collectively with Investments, the "AT&T Entities"). 3/

- --------

1/       Amending the Amended and Restated Schedule 13D dated December 28, 1995.

2/       For the purpose of computing this percentage, the Amended Warrant and
         Warrant No. 2 were deemed to be exercised in full and the shares of
         Common Stock issuable upon such exercise were deemed to be outstanding.

3/       Prior to the conversion of the remaining Mtel Convertible Debentures in
         December 1995, and the resulting transfer of the 760,869 shares of
         Common Stock from Mtel L.P. to Singapore Telecom, the following
         entities might also have been deemed to be part of such group: Mtel
         L.P., Mtel Space Technologies Corporation ("Mtel Corp.") (Mtel L.P.'s
         general partner), and Mtel Technologies, Inc. ("Mtel Corp. Affiliate")
         (Mtel L.P.'s limited partner) (collectively, the "Mtel Group").
<PAGE>

                                                                               5

         The Reporting Persons expressly disclaim beneficial ownership of shares
of Common Stock beneficially owned by the Hughes Entities and the AT&T Entities,
and the filing of this statement by the Reporting Persons shall not be construed
as an admission by the Reporting Persons that either of them is, for purposes of
Section 13(d) of the Act, the beneficial owner of any of the shares of Common
Stock held by the Hughes Entities or the AT&T Entities.

         Based upon information supplied by the Issuer, the Reporting Persons
believe that the Hughes Entities and the AT&T Entities beneficially own the
number of shares of Common Stock set forth in the table below as of November 30,
1999, constituting in each case that percentage of the outstanding Common Stock
set forth in the table:

Name of Beneficial Owner                  Number of Shares       Percentage
- ------------------------                  ----------------       ----------
Hughes Communications
  Satellite Services, Inc. 4/                 6,692,108              --

Hughes Electronics Corporation 5/             4,969,688              --
                                              ---------             ---

         Hughes Entities as a Group          11,661,796            21.8 6/

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

Space Technologies
  Investments, Inc.                           1,206,192              --

Transit Communications, Inc.                    681,818              --

Satellite Communications
  Investments Corporation                     1,113,135              --
                                              ---------             ---

         AT&T Entities as a Group             3,001,145             6.2

- --------

4/       Includes 25,486 shares of Common Stock issuable to Hughes upon the
         exercise of certain warrants previously issued by the Issuer. These
         warrants are exercisable through January 19, 2001 at an exercise price
         of $.01 per share.

5/       Consists of 4,205,121 shares of Common Stock issuable upon the exercise
         of a warrant that Hughes Electronics received as part of the
         consideration for a guaranty that it provided in connection with
         long-term bank financing for the Issuer's subsidiary, and 764,567
         shares of Common Stock issuable upon the exercise of another warrant
         that Hughes Electronics received as part of the consideration for a
         guaranty that it provided in connection with the restructuring of the
         long-term financing. Each warrant is exercisable through March 31, 2005
         at an exercise price of $7.3571 per share.

6/       For the purpose of computing this percentage, warrants held by the
         Hughes Entities were deemed to be exercised in full and the shares of
         Common Stock issuable upon such exercise were deemed to be outstanding.
<PAGE>

                                                                               6

(b) Singapore Telecom has sole power to vote or to direct the vote, and sole
power to dispose or to direct the disposition of, the shares of Common Stock
beneficially owned by it, subject to the effect of the agreements referred to in
Item 6. As noted in Item 2 above, Singapore Telecom is approximately 80% owned
by Temasek. The filing of this statement should not, however, be construed as an
admission that Temasek is, for purposes of Section 13(d) of the Act, the
beneficial owner of any of the Common Stock beneficially owned by Singapore
Telecom.

(c) Since the Reporting Person's most recent Schedule 13D amendment was filed,
Singapore Telecom has engaged in certain open market sales of Common Stock,
which, in the aggregate, amount to over 1% of the shares of Common Stock
outstanding as of November 30, 1999 (based on information supplied by the
Issuer). Those sales were as follows:

Date of Transaction           Number of Shares       Average Price Per Share
- -------------------           ----------------       -----------------------
     11/22/99                      19,000                    $19.28
     11/23/99                      17,600                    $18.61
     11/29/99                       5,000                    $18.00
     12/02/99                      82,500                    $15.41
     12/03/99                      65,000                    $15.07
     12/06/99                      10,000                    $14.19
     12/08/99                     250,000                    $14.00
     12/09/99                     311,769                    $16.06

         The Reporting Persons are not aware of any transactions in shares of
Common Stock that were effectuated during the past 60 days by the Hughes
Entities or the AT&T Entities, or by any of the persons listed in Schedule I or
II.

(d) 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 Common Stock beneficially owned by the Reporting
Persons.

(e) Not applicable.

Item 7.  Material to be Filed as Exhibits

         Exhibit I in Item 7 is amended as follows:

         Exhibit I -- Joint Filing Agreement dated December 20, 1999
<PAGE>

                                                                               7

                                   SIGNATURES


         After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.

                                      SINGAPORE TELECOMMUNICATIONS LIMITED

                                      By: /s/ Hoh Wing Chee
                                          -----------------
                                          Name:  Hoh Wing Chee
                                          Title: VP (International Network)

Dated:  December 20, 1999


                                      TEMASEK HOLDINGS (PRIVATE) LIMITED

                                      By: /s/ Ong Wen Wendy
                                          -----------------
                                          Name:  Ong Wen Wendy (Ms.)
                                          Title: Vice President/
                                                 Company Secretary

Dated:  December 20, 1999
<PAGE>

                                                                               8

                                  EXHIBIT INDEX

              Exhibit I in the Exhibit Index is amended as follows:


          Exhibit I    Joint Filing Agreement dated December 20, 1999


                                    EXHIBIT I

                             JOINT FILING AGREEMENT


         In accordance with Rule 13d-1(k) under the Securities Exchange Act of
1934, as amended, the persons named below agree to the joint filing on behalf of
each of them of a statement on Schedule 13D dated December 20, 1999 with respect
to the Common Stock, par value $.01 per share, of American Mobile Satellite
Corporation, a Delaware corporation. This Joint Filing Agreement shall be
included as an Exhibit to such joint filing. In evidence thereof each of the
undersigned, being duly authorized, hereby executes this Agreement this 20th day
of December 1999.

                                      SINGAPORE TELECOMMUNICATIONS LIMITED

                                      By: /s/ Hoh Wing Chee
                                          -----------------
                                          Name:  Hoh Wing Chee
                                          Title: VP (International Network)


                                      TEMASEK HOLDINGS (PRIVATE) LIMITED

                                      By: /s/ Ong Wen Wendy
                                          -----------------
                                          Name:  Ong Wen Wendy (Ms.)
                                          Title: Vice President/
                                                 Company Secretary


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