GLOBAL TELESYSTEMS GROUP INC
S-1/A, 1998-02-11
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 11, 1998
    
 
   
                                                      REGISTRATION NO. 333-45915
    
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
   
                                AMENDMENT NO. 1
    
 
   
                                       TO
    
 
                                    FORM S-1
 
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                         GLOBAL TELESYSTEMS GROUP, INC.
               (Exact name of registrant as specified in charter)
 
   
<TABLE>
<S>                              <C>                              <C>
            DELAWARE                           4813                          94-3068423
  (State or other jurisdiction
      of incorporation or          (Primary Standard Industrial           (I.R.S. Employer
         organization)             Classification Code Number)         Identification Number)
</TABLE>
    
 
                             ---------------------
 
   
<TABLE>
<C>                                              <C>
              1751 PINNACLE DRIVE                               WILLIAM H. SEIPPEL
           NORTH TOWER -- 12TH FLOOR                           1751 PINNACLE DRIVE
                MCLEAN, VA 22102                            NORTH TOWER -- 12TH FLOOR
                 (703) 918-4500                                  MCLEAN, VA 22102
                                                                  (703) 918-4558
  (Address, including zip code, and telephone        (Name, address, including zip code, and
   number, including area code, of registrant's  telephone number, including area code, of agent
          principal executive offices)                             for service)
</TABLE>
    
 
                             ---------------------
                                   Copies to:
                            DAVID J. BEVERIDGE, ESQ.
                              SHEARMAN & STERLING
                              599 LEXINGTON AVENUE
                            NEW YORK, NEW YORK 10022
                             ---------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
 
     If the securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box.  [ ]
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [X]
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
- ---------------------.
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier registration statement for the same
offering.  [ ]
- ---------------------.
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434
under the Securities Act, please check the following box.  [ ]
 
   
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SUCH
SECTION 8(a), MAY DETERMINE.
    
 
================================================================================
<PAGE>   2
 
   
                                EXPLANATORY NOTE
    
 
   
     This Amendment No. 1 is being filed solely for the purpose of amending Item
16 of Part II of the Registration Statement (Registration No. 333-45915) and the
filing of an additional exhibit. This Amendment No. 1 does not contain a copy of
the Prospectus included in the Registration Statement, which is unchanged from
the Registration Statement filed on February 9, 1998.
    
<PAGE>   3
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the estimated expenses, other than
underwriting discounts and commissions, to be borne by the Company in connection
with the offering of the securities being hereby registered.
 
<TABLE>
<CAPTION>
                            ITEM
                            ----
<S>                                                           <C>
SEC Registration Fee........................................  $   42,712
Accounting Fees and Expenses................................      10,000
Legal Fees and Expenses.....................................      15,000
Printing Expenses...........................................      10,000
Miscellaneous...............................................      10,000
                                                              ----------
          TOTAL.............................................  $   87,712
                                                              ==========
</TABLE>
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law ("DGCL") provides that
a corporation may indemnify any person who was or is a party or is threatened to
be made a party to any threatened, pending or completed action, suit or
proceeding whether civil, criminal or investigative (other than an action by or
in the right of the corporation) by reason of the fact that he is or was a
director, officer, employee or agent of the corporation, or is or was serving at
the request of the corporation as a director, officer, employee or agent of
another corporation, partnership, joint venture, trust or other enterprise,
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. Section 145 further
provides that a corporation similarly may indemnify any such person serving in
any such capacity who was or is a party or is threatened to be made a party to
any threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor, against expenses (including
attorneys' fees) actually and reasonably incurred in connection with the defense
or settlement of such action or suit if he acted in good faith and in a manner
he reasonably believed to be in or not opposed to the best interests of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the corporation unless and only to the extent that the Delaware Court
of Chancery or such other court in which such action or suit was brought shall
determine upon application that, despite the adjudication of liability but in
view of all the circumstances of the case, such person is fairly and reasonably
entitled to indemnity for such expenses which the Court of Chancery or such
other court shall deem proper.
 
     Section 102(b)(7) of the DGCL permits a corporation to include in its
certificate of incorporation a provision eliminating or limiting the personal
liability of a director to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, provided that such provision
shall not eliminate or limit the liability of a director (i) for any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) for
acts or omission not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) under Section 174 of the DGCL (relating to
unlawful payment of dividends and unlawful stock purchase and redemption) or
(iv) for any transaction from which the director derived an improper personal
benefit.
 
     The Company's Certificate of Incorporation (the "Certificate") provides
that the Company's Directors shall not be liable to the Company or its
stockholders for monetary damages for breach of fiduciary duty as a director
provided, however, that such exculpation from liabilities is not permitted with
respect to liability arising from items described in clauses (i) through (iv) in
the preceding paragraph. The Certificate and the Company's By-Laws further
provide that the Company shall indemnify its directors and officers to the
fullest extent permitted by the DGCL.
 
                                      II-1
<PAGE>   4
 
     The directors and officers of the Company are covered under directors' and
officers' liability insurance policies maintained by the Company.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
     The foregoing reflects a 3-for-2 common stock split and an increase in the
par value per share of common stock to $0.10 effective December 1997.
 
     Within the past three years the Company issued securities which were not
registered under the Securities Act of 1933, as amended (the "Securities Act")
as follows:
 
     On March 13, 1995, the Company issued 400,000 shares of common stock, par
value $0.10 per share, pursuant to a stock purchase agreement. The shares were
issued to CIBV Liquidating B.V., a closed company with limited liability
organized under the laws of the Netherlands in exchange for the Company's
interest in PrimTelefone. No underwriter or underwriting discount was involved
in the offering. Exemption from registration was claimed under Section 4(2) of
the Securities Act regarding transactions by an issuer not involving any public
offering.
 
     On June 21, 1995, the Company issued 5,090,876 shares of common stock, par
value $0.10 per share, at a purchase price of $9.00 per share, for an aggregate
offering price of $45.8 million, pursuant to a stock purchase agreement. In
addition to (i) certain investment funds and (ii) certain individual private
investors, these shares were issued to certain members of management and various
entities affiliated with certain members of management. No underwriter or
underwriting discount was involved in the offering. Exemption from registration
was claimed under Section 4(2) of the Securities Act regarding transactions by
an issuer not involving any public offering.
 
     On January 19, 1996, and June 6, 1996, the Company granted affiliates of
George Soros an aggregate of 4,444,443 warrants, each warrant to purchase one
share of common stock, par value $0.10 per share, at an exercise price of $10.27
per share. The exercise price of the warrants was automatically reduced to $9.33
per share as of December 31, 1996 because the debt obligations remained
outstanding. The warrants were issued in connection with the Company's issuance
for cash of $40 million of notes to affiliates of George Soros, which notes bear
interest at a rate of 10% per annum and mature on March 3, 2001. No underwriter
or underwriting discount was involved in the offering. Exemption from
registration was claimed under Section 4(2) of the Securities Act regarding
transactions by an issuer not involving any public offering.
 
     On February 2, 1996, the Company granted affiliates of Capital Research
International an aggregate of 3,333,333 warrants, each warrant to purchase one
share of common stock, par value $0.10 per share, at an exercise price of $10.27
per share. The exercise price of the warrants was automatically reduced to $9.33
per share as of December 31, 1996 because the debt obligations remained
outstanding. The warrants were issued in connection with the Company's issuance
for cash of $30 million of notes to affiliates of Capital Research
International, which notes bear interest at a rate of 10% per annum and mature
on March 31, 2001. No underwriter or underwriting discount was involved in the
offering. Exemption from registration was claimed under Section 4(2) of the
Securities Act regarding transactions by an issuer not involving any public
offering.
 
     On July 23, 1996, July 31, 1996, August 8, 1996, August 22, 1996 and
September 12, 1996 the Company issued an aggregate of 8,348,532 shares of common
stock, par value $0.10 per share, at a purchase price of $13.33 per share, for
an aggregate offering price of $111 million, pursuant to a stock purchase
agreement. In addition to (i) certain investment funds and (ii) certain
individual private investors, these shares were issued to certain members of
management and various entities affiliated with certain members of management.
Exemption from registration was claimed under Section 4(2) of the Securities Act
regarding transactions by an issuer not involving any public offering.
 
     On July 14, 1997 and July 31, 1997, the Company issued an aggregate
$141,295,000 of its Senior Subordinated Convertible Bonds due 2000, convertible
into the common stock, par value $0.10 per share, at a purchase price of 100%,
pursuant to a subscription agreement. UBS Securities LLC, Donaldson, Lufkin &
Jenrette Securities Corporation and Merrill Lynch & Co. acted as managers in the
offering and the aggregate discount was $5,651,800. The securities were sold to
a limited number of qualified institutional buyers as
                                      II-2
<PAGE>   5
 
defined in Rule 144A under the Securities Act and to non-U.S. persons outside
the United States. Exemption from registration was claimed under Rule 144A and
Regulation S of the Securities Act.
 
     On August 15, 1997, August 29, 1997 and September 5, 1997, the Company
issued an aggregate 2,502,686 shares of common stock, par value $0.10 per share,
at a purchase price of $15.67 per share, for an aggregate offering price of
$39.2 million, pursuant to a stock purchase agreement. In addition to (i)
certain investment funds and (ii) certain individual private investors, these
shares were issued to certain members of management and various entities
affiliated with certain members of management. Exemption from registration was
claimed under Section 4(2) of the Securities Act regarding transactions by an
issuer not involving any public offering.
 
     On August 29, 1997, the Company issued $3.5 million of its Senior
Subordinated Convertible Bonds due 2000, convertible into the common stock, par
value $0.10 per share, at a purchase price of 100%. In addition to (i) certain
investment funds and (ii) certain individual private investors, these shares
were issued to certain members of management and various entities affiliated
with certain members of management. Exemption from registration was claimed
under Section 4(2) of the Securities Act regarding transactions by an issuer not
involving any public offering.
 
ITEM 16. EXHIBITS
 
     (a) Exhibits:
 
     The following is a list of exhibits filed as a part of this registration
statement.
 
   
<TABLE>
<CAPTION>
  <C>         <C>  <S>
  3.1**       --   Certificate of Incorporation of SFMT, Inc.
  3.2**       --   Certificate of Correction to the Certificate of
                   Incorporation of SFMT, Inc., filed with the Delaware
                   Secretary of State on October 8, 1993
  3.3**       --   Certificate of Ownership and Merger Merging San
                   Francisco/Moscow Teleport, Inc. into SFMT, Inc., filed with
                   the Delaware Secretary of State on November 3, 1993
  3.4**       --   Certificate of Amendment to the Certificate of Incorporation
                   of SFMT, Inc., filed with the Delaware Secretary of State on
                   January 12, 1995
  3.5**       --   Certificate of Amendment to the Certificate of Incorporation
                   of SFMT, Inc., filed with the Delaware Secretary of State on
                   February 22, 1995
  3.6**       --   Certificate of Amendment to the Certificate of Incorporation
                   of Global TeleSystems Group, Inc., filed with the Delaware
                   Secretary of State on October 16, 1996
  3.7**       --   By-laws of SFMT, Inc.
  3.8**       --   Certificate of Amendment to the Certificate of Incorporation
                   of Global TeleSystems Group, Inc., filed with the Delaware
                   Secretary of State on December 1, 1997
  3.9**       --   Form of Amended and Restated By-laws of Global TeleSystems
                   Group, Inc. (supersedes By-laws of SFMT, Inc. filed as
                   Exhibit 3.7)
  4.1**       --   Form of Specimen Stock Certificate for Common Stock of the
                   Registrant
  4.2**       --   Indenture dated as of July 14, 1997 between the Company and
                   The Bank of New York (including the form of Senior
                   Subordinated Convertible Bond due 2000 as an exhibit
                   thereto)
  4.3**       --   Registration Rights Agreement, dated as of July 14, 1997,
                   between Global TeleSystems Group, Inc. and UBS Securities
                   LLC.
  4.4**       --   Indenture dated as of August 19, 1997 between Hermes Europe
                   Railtel B.V. and The Bank of New York (including the form of
                   11 1/2% Senior Note due 2007 as an exhibit thereto)
  4.5**       --   Registration Rights Agreement dated as of August 19, 1997
                   between Hermes Europe Railtel B.V. and Donaldson, Lufkin &
                   Jenrette Securities Corporation, UBS Securities LLC, and
                   Lehman Brothers, Inc.
  4.6**       --   Form of Rights Agreement between Global TeleSystems Group,
                   Inc. and The Bank of New York, as Rights Agent
  5.1*        --   Opinion of Shearman & Sterling respecting the Bonds and
                   Common Stock registered hereby
</TABLE>
    
 
                                      II-3
<PAGE>   6
<TABLE>
<CAPTION>
  <C>         <C>  <S>
  10.1**      --   Senior Note Purchase Agreement, dated as of January 19,
                   1996, among Global TeleSystems Group, Inc., The Open Society
                   Institute and Chatterjee Fund Management, L.P.
  10.1(a)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated June 6, 1996
  10.1(b)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated June 6, 1996
  10.1(c)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated July 23, 1996
  10.1(d)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated September 16, 1996
  10.1(e)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated July 11, 1997
  10.1(f)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated July 29, 1997
  10.1(g)**   --   Amendment to Senior Note Purchase Agreement dated January
                   19, 1996 among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.,
                   dated September 29, 1997
  10.2**      --   Registration Rights Letter Agreement, dated as of January
                   19, 1996, among Global TeleSystems Group, Inc., The Open
                   Society Institute and Chatterjee Fund Management, L.P.
  10.3**      --   Warrant Agreement, dated as of January 19, 1996, among
                   Global TeleSystems Group, Inc., The Open Society Institute
                   and Chatterjee Fund Management, L.P.
  10.4**      --   Joint Venture Letter Agreement, dated January 19, 1996,
                   among Global TeleSystems Group, Inc., The Open Society
                   Institute and Chatterjee Fund Management, L.P.
  10.5        --   Intentionally Omitted
  10.6**      --   Registration Rights Letter Agreement, dated June 6, 1996,
                   among the Company, The Open Society Institute, Winston
                   Partners II LDC and Winston Partners II LLC
  10.7**      --   Warrant Agreement, dated as of June 6, 1996, between Global
                   TeleSystems Group, Inc., The Open Society Institute, Winston
                   Partners II LDC and Winston Partners II LLC
  10.8**      --   Senior Note Purchase Agreement, dated as of February 2,
                   1996, between Global TeleSystems Group, Inc. and Emerging
                   Markets Growth Fund, Inc.
  10.8(a)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated June 6, 1996 (see
                   Exhibit No. 10.1(b))
  10.8(b)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated June 6, 1996
  10.8(c)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated July 25, 1996
  10.8(d)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated September 10, 1996
  10.8(e)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated September 16, 1996
</TABLE>
 
                                      II-4
<PAGE>   7
<TABLE>
<CAPTION>
  <C>         <C>  <S>
  10.8(f)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated December 30, 1996
  10.8(g)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated May 13, 1997
  10.8(h)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated June 20, 1997
  10.8(i)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated July 11, 1997
  10.8(j)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated July 21, 1997
  10.8(k)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated August 14, 1997
  10.8(l)**   --   Amendment to Senior Note Purchase Agreement, dated as of
                   February 2, 1996, between Global TeleSystems Group, Inc. and
                   Emerging Markets Growth Fund, Inc., dated September 29, 1997
  10.9**      --   Registration Rights Letter Agreement, dated as February 2,
                   1996, between Global TeleSystems Group, Inc. and Emerging
                   Markets Growth Fund, Inc.
  10.10**     --   Warrant Agreement, dated as of February 2, 1996, between
                   Global TeleSystems Group, Inc. and Emerging Markets Growth
                   Fund, Inc.
  10.11       --   Intentionally Omitted
  10.12**     --   Registration Rights Letter Agreement, dated as February 2,
                   1996, between Global TeleSystems Group, Inc. and Capital
                   International Emerging Markets Funds
  10.13**     --   Warrant Agreement, dated as of February 2, 1996, between
                   Global TeleSystems Group, Inc. and Capital International
                   Emerging Markets Funds
  10.14**     --   Global TeleSystems Group, Inc. Non-Employee Directors' Stock
                   Option Plan
  10.15**     --   GTS-Hermes, Inc. 1994 Stock Option Plan
  10.16**     --   Restricted Stock Grant letter, dated as of January 1, 1995
  10.17**     --   Employment Agreement dated as of January 1995 between SFMT,
                   Inc. and Jan Loeber
  10.18**     --   Employment Agreement dated as of April 1996 between GTS
                   Group, Inc. and Louis Toth
  10.19**     --   Employment Agreement dated as of April 1996 between GTS
                   Group, Inc. and Gerald W. Thames
  10.20**     --   Employment Agreement dated as of April 1996 between GTS
                   Group, Inc. and Raymond J. Marks
  10.21**     --   Employment Agreement dated as of April 1996 between GTS
                   Group, Inc. and Henry Radzikowski
  10.22**     --   SFMT, Inc. Equity Compensation Plan
  10.23**     --   Form of Non-Statutory Stock Option Agreement
  10.24**     --   Amended and Restated 1992 Stock Option Plan of Global
                   TeleSystems Group Inc. dated as of January 16, 1997
  10.25**     --   GTS-Hermes 1994 Stock Option Grant, Non-Qualified Stock
                   Option Grant
  10.26**     --   Agreement on the Creation and Functions of the Joint Venture
                   of EDN Sovintel, dated June 18, 1990
  10.27**     --   Stock Purchase Agreement among Global Telesystems Group,
                   Inc, Kompaniya "Invest-Project," Swinton Limited, GTS-Vox
                   Limited, and MTU-Inform, dated September 6, 1995
</TABLE>
 
                                      II-5
<PAGE>   8
   
<TABLE>
<CAPTION>
  <C>         <C>  <S>
  10.28**     --   Certificate of Registration of Revised and Amended
                   Foundation Document in the State Registration of Commercial
                   Organizations, dated May 30, 1996
  10.29**     --   Agreement on the Creation and Functions of the Joint Venture
                   Sovam Teleport, dated May 26, 1992
  10.30**     --   Amended and Restated Joint Venture Agreement between GTS
                   Cellular, Tricor B.V., Gerard Essing, Ivan Laska, and Erik
                   Jennes, dated July 6, 1995
  10.31**     --   Amended and Restated Shareholders' Agreement between HIT
                   Rail B.V., GTS-Hermes, Inc., Nationale Maatschappu Der
                   Belgische Spoorwegen, Teleport B.V., AB Swed Carrier, and
                   Hermes Europe Railtel B.V., dated July, 1997
  10.31(a)**  --   Shareholders' Agreement among the Hermes Europe Railtel
                   B.V., GTS-Hermes Inc., HIT Rail B.V., SNCB/NMBS and AB Swed
                   Carrier (incorporated by reference to Exhibit 10.1 to the
                   Hermes Europe Railtel B.V.'s Registration Statement on Form
                   S-4 (File No. 333-37719) filed on December 11, 1997)
                   (supersedes the Amended and Restated Shareholders' Agreement
                   incorporated by reference as Exhibit 10.31 to this
                   Registration Statement)
  10.32**     --   Company Agreement between The Societe National de
                   Financement, GTS S.A.M. and The Principality of Monaco,
                   dated September 27, 1995
  10.33**     --   Joint Venture Agreement between SFMT-Hungaro Inc. and
                   Montana Holding Vagyonkezelo Kft., dated December 23, 1993
  10.34**     --   Joint Venture and Shareholders' Agreement among Gerard
                   Aircraft Sales and Leasing Company, SFMT-Hungaro Inc., and
                   Microsystem Telecom Rt., dated August 5, 1994
  10.35**     --   Agreement on the Establishment of Limited Liability Company
                   between SFMT-Czech, Inc. and B&H s.r.o., dated July 12, 1994
  10.36**     --   Formation of the Equity Joint Venture between GTS and SSTIC,
                   dated April 12, 1995
  10.37**     --   Contract to Establish the Sino-foreign Cooperative Joint
                   Venture Beijing Tianmu Satellite Communications Technology
                   Co., Ltd, amended, by and between China International Travel
                   Service Telecom Co., Ltd. and American China Investment
                   Corporation, dated March 27, 1996
  10.38**     --   Joint Venture Contract between GTS TransPacific Ventures
                   Limited and Shanghai Intelligence Engineering, Inc., dated
                   March 28, 1996
  10.39**     --   Agreement between Global TeleSystems Group, Inc. and Cesia
                   S.A., dated June 21, 1997
  10.40**     --   Consulting Agreement between SFMT, Inc. and Alan B. Slifka,
                   dated March 1, 1994
  10.41**     --   Consulting Agreement between Global TeleSystems Group, Inc.
                   and Bernard J. McFadden, dated August 15, 1996
  10.42**     --   Consulting Agreement between CESIA S.A. and Hermes Europe
                   Railtel B.V., dated June 20, 1997
  11.1**      --   Statement regarding computation of per share earnings
  21.1**      --   List of Subsidiaries of the Registrant
  23.1*       --   Consent of Shearman & Sterling (included in its opinion
                   delivered under Exhibit No. 5.1)
  23.2***     --   Consent of Ernst & Young LLP, Ernst & Young (CIS) Ltd., and
                   Ernst & Young Reviseurs d'Entreprises S.C.C.
  23.3***     --   Report of Ernst & Young LLP
  24.1***     --   Powers of Attorney (included on signature page to this
                   registration statement)
  27.1**      --   Financial Data Schedule extracted from 12/31/96 audited
                   financial statements
  27.2**      --   Financial Data Schedule extracted from 9/30/97 audited
                   financial statements
</TABLE>
    
 
- ---------------
 
     * Filed herewith.
 
   ** Incorporated by reference to the corresponding exhibit to the Company's
      Registration Statement on Form S-1 (File No. 333-36555) filed on September
      26, 1997.
 
   
  *** Filed previously.
    
 
                                      II-6
<PAGE>   9
 
(b) Financial Statements and Schedules:
 
     (1) Financial Statements
 
     The financial statements filed as part of this Registration Statement are
listed in the Index to Financial Statements on page F-1.
 
     (2) Schedules
 
     The Company has furnished Schedule II -- Valuation and Qualifying Accounts
on page S-1 of the Registration Statement. The other financial statement
schedules of the Company have been omitted because the information required to
be set forth therein is not applicable or is shown in the Financial Statements
or Notes thereto.
 
ITEM 17. UNDERTAKINGS
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provisions described under "Item
14 -- Indemnification of Directors and Officers" hereof, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
     The undersigned registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the forms of prospectus filed as part
     of this registration statement in reliance upon Rule 430A and contained in
     forms of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
     The undersigned registrant hereby undertakes to provide to the underwriters
at the closing specified in the underwriting agreements certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.
 
                                      II-7
<PAGE>   10
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant certifies that it has duly caused this Amendment No. 1 to the
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of McLean, Commonwealth of Virginia, on this 10th
day of February, 1998.
    
 
                                            GLOBAL TELESYSTEMS GROUP, INC.
 
                                            By:     /s/ GRIER C. RACLIN
                                              ----------------------------------
                                              Name: Grier C. Raclin
                                              Title: Senior Vice President and
                                                 General Counsel
 
   
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 1 to the Registration Statement has been signed below by the following
persons in the capacities indicated on the 10th day of February, 1998.
    
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                       DATE
                      ---------                                      -----                       ----
<C>                                                    <S>                                 <C>
 
                /s/ GERALD W. THAMES*                  President, Chief Executive Officer  February 10, 1998
- -----------------------------------------------------    and Director (principal
                  Gerald W. Thames                       executive officer)
 
               /s/ WILLIAM H. SEIPPEL                  Executive Vice President of         February 10, 1998
- -----------------------------------------------------    Finance and Chief Financial
                 William H. Seippel                      Officer (principal financial and
                                                         accounting officer)
 
                 /s/ ALAN B. SLIFKA*                   Chairman of the Board of Directors  February 10, 1998
- -----------------------------------------------------
                   Alan B. Slifka
 
                 /s/ GARY GLADSTEIN*                   Director                            February 10, 1998
- -----------------------------------------------------
                   Gary Gladstein
 
                /s/ MICHAEL GREELEY*                   Director                            February 10, 1998
- -----------------------------------------------------
                   Michael Greeley
 
                /s/ BERNARD MCFADDEN*                  Director                            February 10, 1998
- -----------------------------------------------------
                  Bernard McFadden
 
               /s/ STEWART J. PAPERIN*                 Director                            February 10, 1998
- -----------------------------------------------------
                 Stewart J. Paperin
 
                 /s/ W. JAMES PEET*                    Director                            February 10, 1998
- -----------------------------------------------------
                    W. James Peet
 
                  /s/ JEAN SALMONA*                    Director                            February 10, 1998
- -----------------------------------------------------
                    Jean Salmona
</TABLE>
    
 
                                      II-8
<PAGE>   11
   
<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                       DATE
                      ---------                                      -----                       ----
<C>                                                    <S>                                 <C>
 
               /s/ MORRIS A. SANDLER*                  Director                            February 10, 1998
- -----------------------------------------------------
                  Morris A. Sandler
 
                  /s/ JOEL SCHATZ*                     Director                            February 10, 1998
- -----------------------------------------------------
                     Joel Schatz
 
                  /s/ ADAM SOLOMON*                    Director                            February 10, 1998
- -----------------------------------------------------
                    Adam Solomon
 
             *By: /s/ WILLIAM H. SEIPPEL
  -------------------------------------------------
                 William H. Seippel
                  Attorney-in-fact
</TABLE>
    
 
                                      II-9
<PAGE>   12
 
                SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS
 
<TABLE>
<CAPTION>
========================================================================================================
                 COL. A                     COL. B             COL. C              COL. D       COL. E
- --------------------------------------------------------------------------------------------------------
                                                              ADDITIONS
                                                       -----------------------
                                          BALANCE AT   CHARGED TO   CHARGED TO                BALANCE AT
                                          BEGINNING    COSTS AND      OTHER                      END
              DESCRIPTION                 OF PERIOD     EXPENSES     ACCOUNTS    DEDUCTIONS   OF PERIOD
- --------------------------------------------------------------------------------------------------------
<S>                                       <C>          <C>          <C>          <C>          <C>
Allowance for doubtful accounts at
  12/31/94..............................       0                                                    0
Allowance for doubtful accounts at
  12/31/95..............................       0            30                                     30
Allowance for doubtful accounts at
  12/31/96..............................      30           752                                    782
Allowance for doubtful accounts at
  9/30/97...............................     782         1,806                                  2,588
</TABLE>
 
                                       S-1
<PAGE>   13
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                  DESCRIPTION
  -------                                 -----------
<S>         <C>   <C>                                                           <C>
 3.1**       --   Certificate of Incorporation of SFMT, Inc. .................
 3.2**       --   Certificate of Correction to the Certificate of
                  Incorporation of SFMT, Inc., filed with the Delaware
                  Secretary of State on October 8, 1993.......................
 3.3**       --   Certificate of Ownership and Merger Merging San
                  Francisco/Moscow Teleport, Inc. into SFMT, Inc., filed with
                  the Delaware Secretary of State on November 3, 1993.........
 3.4**       --   Certificate of Amendment to the Certificate of Incorporation
                  of SFMT, Inc., filed with the Delaware Secretary of State on
                  January 12, 1995 ...........................................
 3.5**       --   Certificate of Amendment to the Certificate of Incorporation
                  of SFMT, Inc., filed with the Delaware Secretary of State on
                  February 22, 1995 ..........................................
 3.6**       --   Certificate of Amendment to the Certificate of Incorporation
                  of Global TeleSystems Group, Inc., filed with the Delaware
                  Secretary of State on October 16, 1996......................
 3.7**       --   By-laws of SFMT, Inc. ......................................
 3.8**       --   Certificate of Amendment to the Certificate of Incorporation
                  of Global TeleSystems Group, Inc., filed with the Delaware
                  Secretary of State on December 1, 1997......................
 3.9**       --   Form of Amended and Restated By-laws of Global TeleSystems
                  Group, Inc. (supersedes By-laws of SFMT, Inc. filed as
                  Exhibit 3.7)................................................
 4.1**       --   Form of Specimen Stock Certificate for Common Stock of the
                  Registrant .................................................
 4.2**       --   Indenture dated as of July 14, 1997 between the Company and
                  The Bank of New York (including the form of Senior
                  Subordinated Convertible Bond due 2000 as an exhibit
                  thereto) ...................................................
 4.3**       --   Registration Rights Agreement, dated as of July 14, 1997,
                  between Global TeleSystems Group, Inc. and UBS Securities
                  LLC. .......................................................
 4.4**       --   Indenture dated as of August 19, 1997 between Hermes Europe
                  Railtel B.V. and The Bank of New York (including the form of
                  11 1/2% Senior Note due 2007 as an exhibit thereto) ........
 4.5**       --   Registration Rights Agreement dated as of August 19, 1997
                  between Hermes Europe Railtel B.V. and Donaldson, Lufkin &
                  Jenrette Securities Corporation, UBS Securities LLC, and
                  Lehman Brothers, Inc. ......................................
 4.6**       --   Form of Rights Agreement between Global TeleSystems Group,
                  Inc. and The Bank of New York, as Rights Agent..............
 5.1*        --   Opinion of Shearman & Sterling respecting the Bonds and
                  Common Stock registered hereby..............................
10.1**       --   Senior Note Purchase Agreement, dated as of January 19,
                  1996, among Global TeleSystems Group, Inc., The Open Society
                  Institute and Chatterjee Fund Management, L.P. .............
10.1(a)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated June 6, 1996..........................................
10.1(b)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated June 6, 1996..........................................
10.1(c)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated July 23, 1996.........................................
10.1(d)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated September 16, 1996 ...................................
10.1(e)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated July 11, 1997.........................................
</TABLE>
    
<PAGE>   14
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                  DESCRIPTION
  -------                                 -----------
<S>         <C>   <C>                                                           <C>
10.1(f)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated July 29, 1997.........................................
10.1(g)**    --   Amendment to Senior Note Purchase Agreement dated January
                  19, 1996 among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P.,
                  dated September 29, 1997....................................
10.2**       --   Registration Rights Letter Agreement, dated as of January
                  19, 1996, among Global TeleSystems Group, Inc., The Open
                  Society Institute and Chatterjee Fund Management, L.P. .....
10.3**       --   Warrant Agreement, dated as of January 19, 1996, among
                  Global TeleSystems Group, Inc., The Open Society Institute
                  and Chatterjee Fund Management, L.P. .......................
10.4**       --   Joint Venture Letter Agreement, dated January 19, 1996,
                  among Global TeleSystems Group, Inc., The Open Society
                  Institute and Chatterjee Fund Management, L.P. .............
10.5         --   Intentionally Omitted
10.6**       --   Registration Rights Letter Agreement, dated June 6, 1996,
                  among the Company, The Open Society Institute, Winston
                  Partners II LDC and Winston Partners II LLC.................
10.7**       --   Warrant Agreement, dated as of June 6, 1996, between Global
                  TeleSystems Group, Inc., The Open Society Institute, Winston
                  Partners II LDC and Winston Partners II LLC.................
10.8**       --   Senior Note Purchase Agreement, dated as of February 2,
                  1996, between Global TeleSystems Group, Inc. and Emerging
                  Markets Growth Fund, Inc. ..................................
10.8(a)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated June 6, 1996 (see
                  Exhibit No. 10.1(b))........................................
10.8(b)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated June 6, 1996......
10.8(c)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated July 25, 1996.....
10.8(d)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated September 10,
                  1996........................................................
10.8(e)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated September 16,
                  1996........................................................
10.8(f)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated December 30,
                  1996........................................................
10.8(g)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated May 13, 1997......
10.8(h)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated June 20, 1997.....
10.8(i)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated July 11, 1997.....
10.8(j)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated July 21, 1997.....
10.8(k)**    --   Amendment to Senior Note Purchase Agreement, dated as of
                  February 2, 1996, between Global TeleSystems Group, Inc. and
                  Emerging Markets Growth Fund, Inc., dated August 14, 1997...
</TABLE>
<PAGE>   15
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                                      DESCRIPTION
- -----------             ---------------------------------------------------------------------------------------
<S>          <C>        <C>                                                                                      <C>
10.8(l)**           --  Amendment to Senior Note Purchase Agreement, dated as of February 2, 1996, between
                        Global TeleSystems Group, Inc. and Emerging Markets Growth Fund, Inc., dated September
                        29, 1997...............................................................................
10.9**              --  Registration Rights Letter Agreement, dated as February 2, 1996, between Global
                        TeleSystems Group, Inc. and Emerging Markets Growth Fund, Inc. ........................
10.10**             --  Warrant Agreement, dated as of February 2, 1996, between Global TeleSystems Group, Inc.
                        and Emerging Markets Growth Fund, Inc. ................................................
10.11               --  Intentionally Omitted
10.12**             --  Registration Rights Letter Agreement, dated as February 2, 1996, between Global
                        TeleSystems Group, Inc. and Capital International Emerging Markets Funds...............
10.13**             --  Warrant Agreement, dated as of February 2, 1996, between Global TeleSystems Group, Inc.
                        and Capital International Emerging Markets Funds.......................................
10.14**             --  Global TeleSystems Group, Inc. Non-Employee Directors' Stock Option Plan...............
10.15**             --  GTS-Hermes, Inc. 1994 Stock Option Plan................................................
10.16**             --  Restricted Stock Grant letter, dated as of January 1, 1995.............................
10.17**             --  Employment Agreement dated as of January 1995 between SFMT, Inc. and Jan Loeber........
10.18**             --  Employment Agreement dated as of April 1996 between GTS Group, Inc. and Louis Toth.....
10.19**             --  Employment Agreement dated as of April 1996 between GTS Group, Inc. and Gerald W.
                        Thames.................................................................................
10.20**             --  Employment Agreement dated as of April 1996 between GTS Group, Inc. and Raymond J.
                        Marks..................................................................................
10.21**             --  Employment Agreement dated as of April 1996 between GTS Group, Inc. and Henry
                        Radzikowski............................................................................
10.22**             --  SFMT, Inc. Equity Compensation Plan....................................................
10.23**             --  Form of Non-Statutory Stock Option Agreement...........................................
10.24**             --  Amended and Restated 1992 Stock Option Plan of Global TeleSystems Group Inc. dated as
                        of January 16, 1997....................................................................
10.25**             --  GTS-Hermes 1994 Stock Option Grant, Non-Qualified Stock Option Grant...................
10.26**             --  Agreement on the Creation and Functions of the Joint Venture of EDN Sovintel, dated
                        June 18, 1990..........................................................................
10.27**             --  Stock Purchase Agreement among Global Telesystems Group, Inc, Kompaniya
                        "Invest-Project," Swinton Limited, GTS-Vox Limited, and MTU-Inform, dated September 6,
                        1995...................................................................................
10.28**             --  Certificate of Registration of Revised and Amended Foundation Document in the State
                        Registration of Commercial Organizations, dated May 30, 1996...........................
10.29**             --  Agreement on the Creation and Functions of the Joint Venture Sovam Teleport, dated May
                        26, 1992...............................................................................
10.30**             --  Amended and Restated Joint Venture Agreement between GTS Cellular, Tricor B.V., Gerard
                        Essing, Ivan Laska, and Erik Jennes, dated July 6, 1995................................
10.31**             --  Amended and Restated Shareholders' Agreement between HIT Rail B.V., GTS-Hermes, Inc.,
                        Nationale Maatschappij Der Belgische Spoorwegen, Teleport B.V., AB Swed Carrier, and
                        Hermes Europe Railtel B.V., dated July, 1997...........................................
10.31(a)**          --  Shareholders' Agreement among the Hermes Europe Railtel, B.V., GTS-Hermes Inc., HIT
                        Rail B.V., SNCB/NMBS and AB Swed Carrier (incorporated by reference to Exhibit 10.1 to
                        the Hermes Europe Railtel B.V.'s Registration Statement on Form S-4 (File No.
                        333-37719) filed on December 11, 1997) (supersedes the Amended and Restated
                        Shareholders' Agreement incorporated by reference as Exhibit 10.31 to this Registration
                        Statement).............................................................................
10.32**             --  Company Agreement between The Societe National de Financement, GTS S.A.M. and The
                        Principality of Monaco, dated September 27, 1995.......................................
10.33**             --  Joint Venture Agreement between SFMT-Hungaro Inc. and Montana Holding Vagyonkezelo
                        Kft., dated December 23, 1993..........................................................
</TABLE>
<PAGE>   16
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                  DESCRIPTION
  -------                                 -----------
<S>         <C>   <C>                                                           <C>
10.34**             --  Joint Venture and Shareholders' Agreement among Gerard Aircraft Sales and Leasing
                        Company, SFMT-Hungaro Inc., and Microsystem Telecom Rt., dated August 5, 1994..........
10.35**             --  Agreement on the Establishment of Limited Liability Company between SFMT-Czech, Inc.
                        and B&H s.r.o., dated July 12, 1994....................................................
10.36**             --  Formation of the Equity Joint Venture between GTS and SSTIC, dated April 12, 1995......
10.37**             --  Contract to Establish the Sino-foreign Cooperative Joint Venture Beijing Tianmu
                        Satellite Communications Technology Co., Ltd, amended, by and between China
                        International Travel Service Telecom Co., Ltd. and American China Investment
                        Corporation, dated March 27, 1996......................................................
10.38**             --  Joint Venture Contract between GTS TransPacific Ventures Limited and Shanghai
                        Intelligence Engineering, Inc., dated March 28, 1996...................................
10.39**             --  Agreement between Global TeleSystems Group, Inc. and Cesia S.A., dated June 21, 1997...
10.40**             --  Consulting Agreement between SFMT, Inc. and Alan B. Slifka, dated March 1, 1994........
10.41**             --  Consulting Agreement between Global TeleSystems Group, Inc. and Bernard J. McFadden,
                        dated August 15, 1996..................................................................
10.42**             --  Consulting Agreement between CESIA S.A. and Hermes Europe Railtel B.V., dated June 20,
                        1997...................................................................................
11.1**              --  Statement regarding computation of per share earnings..................................
21.1**              --  List of Subsidiaries of the Registrant ................................................
23.1*               --  Consent of Shearman & Sterling (included in its opinion delivered under Exhibit No.
                        5.1) ..................................................................................
23.2***             --  Consent of Ernst & Young LLP, Ernst & Young (CIS) Ltd., and Ernst & Young Reviseurs
                        d'Entreprises S.C.C. ..................................................................
23.3***             --  Report of Ernst & Young LLP
24.1***             --  Powers of Attorney (included on signature page to this registration statement).........
27.1**              --  Financial Data Schedule extracted from 12/31/96 audited financial statements...........
27.2**              --  Financial Data Schedule extracted from 9/30/97 audited financial statements............
</TABLE>
    
 
- ---------------
 
  * Filed herewith.
 
 ** Incorporated by reference to the corresponding exhibit to the Company's
    Registration Statement on Form S-1 (File No. 333-36555) filed on September
    26, 1997.
 
   
*** Filed previously.
    

<PAGE>   1


                                                                     Exhibit 5.1
                                                                      



                                February 10, 1998




Global TeleSystems Group, Inc.
1751 Pinnacle Drive
North Tower - 12th Floor
McLean, VA  22102


                         Global TeleSystems Group, Inc.

Ladies and Gentlemen:

                 We have acted as counsel to Global TeleSystems Group, Inc., a
Delaware corporation (the "Company"), in connection with the preparation and
filing by the Company with the Securities and Exchange Commission under the
Securities Act of 1933, as amended, of a Registration Statement on Form S-1
(Registration No. 333-45915), as it has been and may be amended (the
"Registration Statement"), including the prospectus included therein at the
time the Registration Statement is declared effective relating to the proposed
resale of $144,787,000 aggregate principal amount of the Company's Senior 
Subordinated Convertible Bonds due 2000 (the "Bonds") and 7,239,350 shares of
the Company's common stock, par value $.10 per share (the "Conversion Shares"),
issuable upon conversion of the Bonds, plus such additional indeterminate
number of Conversion Shares as may become issuable upon conversion of the Bonds
as a result of adjustments to the conversion price.

                 In this capacity, we have examined the Registration Statement,
the Indenture (the "Indenture") under which the Bonds were issued and 
originals, or copies identified to our satisfaction, of such corporate records 
of the Company, certificates and statements of public officials, officers of the
Company and others and such other documents, agreements and instruments as we
have deemed necessary as a basis for the opinions hereinafter expressed.  In
our examinations, we have assumed the genuineness of all signatures, the
authenticity of all documents submitted to us as originals and the conformity
with the originals of all documents submitted to us as copies.
<PAGE>   2

                                      2



                 Our opinions expressed below are limited to the law of the
State of New York, the General Corporation Law of the State of Delaware and the
Federal law of the United States, and we do not express any opinion herein
concerning any other law.

                 Based on the foregoing, and having regard for such legal
considerations as we deem relevant, we are of the opinion that:

                 (i) the Bonds constitute valid and binding obligations 
of the Company entitled to the benefits of the Indenture and enforceable 
against the Company in accordance with their terms, except as enforcement 
thereof may be limited by bankruptcy, insolvency (including, without 
limitation, all laws relating to fraudulent transfers), reorganization, 
moratorium or similar laws affecting enforcement of creditors' rights 
generally and except as enforcement thereof is subject to general principles 
of equity (regardless of whether enforcement is considered in a proceeding in 
equity or at law); and

                 (ii) the Conversion Shares to be issued by the Company from
time to time upon the conversion of the Bonds in accordance with the terms of
the Bonds, will be validly issued, fully paid and non-assessable.

                 We hereby consent to the filing of this opinion as an exhibit
to the Registration Statement and to the reference to our firm in the
Prospectus under the heading "Legal Matters".

                                                     Very truly yours,




                                                     Shearman & Sterling


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