VULCAN VENTURES INC
SC 13D/A, 1999-11-05
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13D/A

                    Under the Securities Exchange Act of 1934

                                (Amendment No.1)*

                            ALLEGIANCE TELECOM, INC.
                                (Name of Issuer)


                                  COMMON STOCK
                         (Title of Class of Securities)


                                    01747T102
                                 (CUSIP Number)

     William D. Savoy                            Gail J. Gordon
     Vulcan Ventures Incorporated                Foster Pepper & Shefelman PLLC
     110-110th Avenue N.E., Suite 550            1111 Third Avenue, Suite 3400
     Bellevue, WA  98004                         Seattle, WA  98101
     (206) 453-1940                              (206) 447-4400

           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)


                               November 1, 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 ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box.

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>



- - ------------------------------------------------------------------------------
CUSIP NO. 01747T102             13D                           Page 2 of 8 Pages

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

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

         Vulcan Ventures Incorporated
- - -------- ---------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) |_|
                                                                   (b) |_|

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

         State of Washington
- - -------- ---------------------------------------------------------------------
                                         ----- --------------------------------
NUMBER OF SHARES BENEFICIALLY OWNED BY    7    SOLE VOTING POWER
      EACH REPORTING PERSON WITH
                                               -0- shares
                                         ----- --------------------------------
                                          8    SHARED VOTING POWER

                                               4,000,000 shares (1)
                                         ----- --------------------------------
                                          9    SOLE DISPOSITIVE POWER

                                               -0- shares
                                         ----- --------------------------------
                                          10   SHARED DISPOSITIVE POWER

                                               4,000,000 shares (1)
- - ---------------------------------------- ----- -------------------------------
  11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         4,000,000 shares (1)
- - -------- ---------------------------------------------------------------------
  12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


- - -------- ---------------------------------------------------------------------
  13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

         6.2%
- - ------- ----------------------------------------------------------------------
  14     TYPE OF REPORTING PERSON*

         CO
- - -------- ---------------------------------------------------------------------
(1) Directly owned by Vulcan  Ventures  Incorporated.  Paul G. Allen is the sole
shareholder  of Vulcan  Ventures  Incorporated  and may be deemed to have shared
voting and  dispositive  power with respect to such shares.

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>

- - ------------------------------------------------------------------------------
CUSIP NO. 01747T102             13D                           Page 3 of 8 Pages

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

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

         Paul G. Allen
- - -------- ---------------------------------------------------------------------
   2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a) |_|
                                                                (b) |_|

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

         United States of America
- - -------- ---------------------------------------------------------------------
                                         ------ -------------------------------
 NUMBER OF SHARES BENEFICIALLY OWNED BY     7    SOLE VOTING POWER
       EACH REPORTING PERSON WITH
                                   -0- shares
                                         ------ -------------------------------
                                            8    SHARED VOTING POWER

                                                 4,000,000 shares (2)
                                         ------ -------------------------------
                                            9    SOLE DISPOSITIVE POWER

                                                  -0- shares
                                         ------ -------------------------------
                                           10    SHARED DISPOSITIVE POWER

                                                 4,000,000 shares(2)
- - ------------------------------------------------------------------------------
  11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         4,000,000 shares(2)
- - -------- ---------------------------------------------------------------------
  12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*


- - -------- ---------------------------------------------------------------------
  13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

          6.2%
- - -------- ---------------------------------------------------------------------
  14     TYPE OF REPORTING PERSON*

         IN
- - -------- ---------------------------------------------------------------------
(2) Directly owned by Vulcan  Ventures  Incorporated.  Paul G. Allen is the sole
shareholder  of Vulcan  Ventures  Incorporated  and may be deemed to have shared
voting and  dispositive  power with respect to such shares.

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

                                  SCHEDULE 13D


Item 1.  Security and Issuer.

         This statement  relates to the Common Stock,  $.01 Par value per share,
of Allegiance Telecom, Inc., a Delaware corporation (the "Issuer"). The Issuer's
principal  executive officers are located at 1950 Stemmons Freeway,  Suite 3026,
Dallas, Texas 75207. The Issuer's telephone number is (214) 261-7100.

Item 2. Identity and Background.

        The  persons  filing this  statement  are Vulcan  Ventures  Incorporated
("Vulcan  Ventures")  and  Paul  G.  Allen.  Vulcan  Ventures  is  a  Washington
corporation whose principal business is investing in various companies.  Paul G.
Allen is its sole  shareholder.  The  principal  office  of Vulcan  Ventures  is
located at 110-110th Avenue N.E., Suite 550, Bellevue,  Washington 98004. All of
Vulcan  Ventures'  executive  officers and  directors are U.S.  citizens.  Their
names, business addresses and principal occupations are as follows:

                  Paul  G.  Allen,  Vulcan  Ventures  Incorporated,  110 - 110th
         Avenue  N.E.,  Suite 550,  Bellevue,  Washington  98004.  Mr.  Allen is
         Chairman,  President  and sole  shareholder  of Vulcan  Ventures  and a
         Director and sole shareholder of Vulcan Northwest Inc.

                  William D. Savoy,  Vulcan  Northwest  Inc.,  110-110th  Avenue
         N.E.,  Suite  550,  Bellevue,  Washington  98004.  Mr.  Savoy  is  Vice
         President and a Director of Vulcan  Ventures and Chairman and President
         of Vulcan Northwest Inc.

                  Bert E. Kolde, Vulcan Ventures Incorporated, 110-110th Avenue
         N.E., Suite 550, Bellevue, Washington 98004. Mr. Kolde is a Vice
         President, Secretary, Treasurer and a Director of Vulcan Ventures and a
         Vice President of Vulcan Northwest Inc.

                  Jo Allen Patton, Vulcan Northwest Inc., 110-110th Avenue N.E.,
         Suite 550, Bellevue,  Washington 98004. Ms. Patton is Vice Chairman and
         a Vice President of Vulcan Ventures and Vulcan Northwest Inc.

         During the last five years,  Mr.  Allen and Vulcan  Ventures  have not,
nor, to the best  knowledge  of Vulcan  Ventures,  has any other person named in
this  Item  2,  been  convicted  in a  criminal  proceeding  (excluding  traffic
violations or similar  misdemeanors)  or been a party to a civil proceeding of a
judicial or administrative  body of competent  jurisdiction as a result of which
he is or was  subject to a  judgment,  decree or final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

Item 3:  Source and Amount of Funds or Other Consideration.

     On September 13, 1999,  Vulcan Ventures  purchased  1,500,000 shares of the
Issuer's   common  stock,   $.01  par  value  ("Common   Stock")  from  existing
stockholders  in a private  transaction  pursuant to a Common Stock Purchase and
Option  Agreement  dated  August  3,  1999  (the  "Purchase  Agreement")  and  a
Counterpart  Agreement  dated as of September  13, 1999.  Vulcan  Ventures  paid
$50.00 per share for aggregate cash  consideration of $75,000,000.  The Purchase
Agreement  also  granted  Vulcan  Ventures an option to purchase up to 5,000,000
shares of the  Issuer's  Common  Stock at an exercise  price of $56.00 per share
(the "Option") from existing stockholders.  Vulcan Ventures exercised the Option
for 2,500,000  shares on November 1, 1999, for aggregate cash  consideration  of
$140,000,000. The balance of the Option expired unexercised.

         Vulcan  Ventures  funded its  purchase of the Common Stock from its own
working  capital.  None of the funds used to purchase the shares of Common Stock
consisted of funds or other consideration borrowed or otherwise obtained for the
purpose of acquiring, holding, trading or voting the shares of Common Stock.

Item 4:  Purpose of Transaction.

     Vulcan  Ventures  purchased  the  1,500,000  shares of Common  Stock in the
transaction described in Item 3 above from Madison Dearborn Capital Partners II.
L.P.,  Frontenac  VII  Limited   Partnership,   Frontenac  Masters  VII  Limited
Partnership,  Battery  Ventures IV, L.P.,  Battery  Investment  Partners IV, LLC
(collectively,  the  "Sellers"),  Reed E. Hundt (a  director  of the Issuer) and
Gregory E.  Lawler.  The Option  entitled  Vulcan  Ventures to purchase up to an
additional 5,000,000 shares of Common Stock, consisting of 4,147,001 shares from
the Sellers and 852,999 shares (the "Management Shares") from certain management
stockholders  other than the  Issuer's  Chairman  and Chief  Executive  Officer.
Vulcan Ventures  exercised the Option on November 1, 1999, for 2,500,000 shares,
and the balance of the Option expired unexercised.

                           Page 4 of 8
<PAGE>

     As consideration  for the Option,  the Issuer and Go2Net,  Inc., a Delaware
corporation  ("Go2Net")  agreed to enter  good  faith  negotiations  with a view
toward  establishing a mutually acceptable  strategic alliance.  Vulcan Ventures
and Mr.  Allen share  beneficial  ownership of  11,922,406  shares of the common
stock, $.01 par value of Go2Net, Inc.,  representing  approximately 33.7% of the
total  number of  outstanding  shares of  Go2Net's  common  stock as reported by
Go2Net in its Quarterly Report on Form 10-Q filed on August 16, 1999.

     Vulcan  Ventures and Mr. Allen  acquired  the  securities  reported in this
statement for  investment  purposes.  Vulcan  Ventures and Mr. Allen may acquire
additional shares of Common Stock, except as otherwise  agreed in the  Investors
Agreement or Registration  Agreement  described in Item 6 below, Vulcan Ventures
and/or Mr. Allen may acquire  additional shares from time to time in open market
or private  transactions,  depending  on  various  factors,  including,  without
limitation,  the price of the Common  Stock,  stock  market  conditions  and the
business  prospects of the Issuer.  Except as otherwise  agreed in the Investors
Agreement or Registration Agreement,  Vulcan Ventures or Mr. Allen may determine
to  dispose  of  some  or all  of  their  beneficial  holdings  of the  Issuer's
securities.  Each reserves the right to increase or decrease its or his holdings
on such  terms and at such  times as each may  decide,  subject to the terms and
conditions of the Investors Agreement and the Registration Agreement.

         Except as set forth in this  statement,  Vulcan  Ventures and Mr. Allen
have no present  plan or  proposal  that  relates to or would  result in (i) the
acquisition  of additional  securities or the  disposition  of securities of the
Issuer by any person,  (ii) an extraordinary  corporate  transaction,  such as a
merger, reorganization, liquidation, or sale or transfer of a material amount of
assets involving the Issuer or any of its subsidiaries,  (iii) any change in the
Issuer's present Board of Directors or, (iv) any material change in the Issuer's
present  capitalization  or dividend  policy or any other material change in the
Issuer's business or corporate structure, (v) any change in the Issuer's charter
or by-laws or other  actions that may impede the  acquisition  of control of the
Issuer by any  person,  (vi) any change  that  would  result in any class of the
Issuer's equity securities becoming eligible for termination of its registration
pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934, as amended,
or to cease to be  authorized  to be quoted  in  Nasdaq,  or (vii)  any  similar
action.  However,  Vulcan  Ventures and Mr. Allen reserve the right to formulate
plans or  proposals  specified  in clauses (a) through (j) of Item 4 of Schedule
13D, subject to the Investors Agreement and the Registration Agreement.

         Item 5.  Interest in Securities of the Issuer.

     Vulcan Ventures and Mr. Allen each  beneficially  owns 4,000,000  shares of
the Issuer's  Common  Stock.  Vulcan  Ventures'  and Mr.  Allen's  stockholdings
represent  approximately  6.2% of the shares of the class outstanding based upon
64,811,690 shares  outstanding as of June 30, 1999, as reported by the Issuer in
its Quarterly Report, on Form 10-Q filed on August 10, 1999. Vulcan Ventures and
Mr. Allen have shared  voting and  dispositive  power with respect to the Common
Stock.

         To the best  knowledge of Vulcan  Ventures and Mr.  Allen,  none of the
other parties named in Item 2 owns any of the Issuer's Common Stock.

         Except as set forth in Item 4 of this  statement,  Vulcan  Ventures and
Mr. Allen have not,  nor to the  knowledge  of Vulcan  Ventures,  has any of its
executive  officers,  directors or controlling persons named in Item 2, effected
any transactions in the Issuer's Common Stock during the past sixty days.

         Neither  Vulcan  Ventures  nor Mr. Allen knows any other person who has
the right to receive or the power to direct the receipt of dividends from or the
proceeds from the sale of any Common Stock beneficially owned by Vulcan Ventures
or Mr. Allen.


Item 6.  Contracts,  Arrangements,  Understandings  or  Relationships  with
         Respect to Securities of the Issuer.

     Concurrently  with the Purchase  Agreement,  the Issuer and Vulcan Ventures
entered into an Investors  Agreement  (the  "Investors  Agreement")  pursuant to
which the Issuer has  agreed to use its best  efforts to cause (a) one  designee
nominated  by  Vulcan  Ventures  to be  appointed  to the  Issuer's  board  (the
"Board"),  for so long as Vulcan  Ventures  continues to hold at least 1,200,000
shares   (as   adjusted   for   stock   dividends,   stock   splits   and  other
recapitalizations)  of Common Stock,  and (b) two designees  nominated by Vulcan
Ventures to be  appointed  to the Board,  if Vulcan  Ventures  acquires at least
2,500,000  or more  shares  under the  Option,  and so long as  Vulcan  Ventures
continues to hold at least  4,000,000  shares (as adjusted for stock  dividends,
stock splits and other  recapitalizations).  Vulcan  Ventures may not assign its
right to nominate a director or directors under the Investors Agreement.  At the
closing of its initial purchase of Common Stock,  Vulcan Ventures nominated Dino
Vendetti to the Board.  As a result of its  exercise of the Option for 2,500,000
shares,  Vulcan  Ventures  became  entitled to nominate a second director to the
Board.

         Under the Investors  Agreement,  Vulcan  Ventures has agreed that until
September 13, 2000, neither it nor its affiliates may offer,  sell,  transfer or
otherwise  dispose of any of the shares of Common Stock acquired pursuant to the
Purchase  Agreement  without the prior written  consent of the Board,  except by
pledge or to an affiliate of Vulcan Ventures.

         Under  the  Investors  Agreement,  Vulcan  Ventures  is  subject  to  a
standstill  provision for a period beginning on September 13, 1999 and ending on
the  earlier  of (i) the  closing  of a Sale of the  Company,  as defined in the
Investors Agreement, and (ii) the date

                                   Page 5 of 8
<PAGE>

after September 13, 2002 on which Vulcan  Ventures has not had a  representative
sitting  on the  Board  for 180  days  (the  "Standstill  Period").  During  the
Standstill  Period,  Vulcan  Ventures has agreed that it and its  affiliates and
associates will not, directly or indirectly, among other things: (i) acquire any
of the voting  securities (or securities  convertible  or  exchangeable  into or
exercisable  for any voting  securities) of the Issuer or any of its affiliates,
(ii)  acquire  any  assets  of the  Issuer  or any of its  affiliates,  or (iii)
participate in any tender offer,  exchange offer, merger, or other extraordinary
transaction  involving the Issuer or any of its  affiliates;  provided that with
respect to the foregoing clauses (i) through (iii), Vulcan Ventures may take any
of such actions  within 60 days after another person that is not an affiliate or
associate of Vulcan Ventures has made a publicly  announced proposal to take any
such  action  that  would  result  in a Sale of the  Issuer,  so long as  Vulcan
Venture's actions are not in concert with such other person. In addition, during
the Standstill Period, Vulcan Ventures has agreed that it and its affiliates and
associates will not,  directly or indirectly,  among other things:  (i) become a
member of a group with respect to the Common Stock or other equity securities or
assets  of the  Issuer;  (ii)  call or seek to call any  special  meeting  of or
initiate  a  stockholder  vote or  action by  written  consent  of the  Issuer's
stockholders;  (iii) participate in any solicitation of proxies to vote, or seek
to influence  any person or entity with respect to the Issuer,  in opposition to
any  matter  which has been  recommended  by the Board or in favor of any matter
which has not been  approved by the Board;  or (iv) enter into any  discussions,
negotiations,  arrangements or understandings  with any third party with respect
to any of the foregoing.  Notwithstanding the foregoing, Vulcan Ventures and its
affiliates and associates may acquire  additional shares of Common Stock as long
as their aggregate  beneficial  ownership does not exceed 20% of the outstanding
securities  of  the  Issuer  entitled  to  vote  generally  in the  election  of
directors.  Under the  Investors  Agreement,  if the Issuer adopts a stockholder
rights  plan,  the  percentage  of  beneficial  ownership  of  Common  Stock the
acquisition  of which will trigger the  provisions of the plan shall not be less
than 20% for Vulcan Ventures.

         Also concurrently with the Purchase Agreement,  Vulcan Ventures entered
into  an  Amended  and  Restated   Registration   Agreement  (the  "Registration
Agreement")  with the Issuer,  the Sellers and certain other  stockholders  with
respect to the registration of the Issuer's  securities under the Securities Act
of 1933,  as amended.  After  September  13, 2000,  the  Registration  Agreement
entitles  Vulcan  Ventures  to  demand  one  long-form  registration,   such  as
registration on Form S-1, and two short-form registrations, such as registration
on Form S-3,  with  respect to the shares of Common  Stock  purchased  by Vulcan
Ventures  under  the  Purchase  Agreement.  In  addition,  Vulcan  Ventures  may
"piggyback" on primary or secondary  registered public offerings of the Issuer's
securities. The Issuer has agreed to pay the registration expenses in connection
with these demand and "piggyback" registrations.

         Vulcan Ventures has agreed not to make a public sale or distribution of
any of the Issuer's  equity  securities or any  securities  convertible  into or
exchangeable  or exercisable for the Issuer's equity during the seven days prior
to,  and  the  90-day  period  following,   the  effective  date  of  any  other
underwritten demand registration or underwritten piggyback registration,  unless
the managing underwriters otherwise agree.


         Item 7.  Material to be Filed as Exhibits.

         Exhibit           Description

             99.1          Common  Stock  Purchase  and Option  Agreement  dated
                           August  3,  1999  among  Madison   Dearborn   Capital
                           Partners II L.P.,  Frontenac VII Limited Partnership,
                           Frontenac  Masters VII Limited  Partnership,  Battery
                           Ventures IV L.P.,  Battery  Investment  Partners  IV,
                           LLC,  Allegiance  Telecom,  Inc. and Vulcan  Ventures
                           Incorporated.  (Incorporated  by reference to Exhibit
                           99.1 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.2          Counterpart  Agreement,  dated  as of  September  13,
                           1999,  among Madison  Dearborn  Capital  Partners II,
                           L.P.,  Frontenac VII Limited  Partnership,  Frontenac
                           Masters VII Limited Partnership, Battery Ventures IV,
                           L.P.,  Battery  Investment  Partners IV, LLC, Reed E.
                           Hundt  and  Gregory  E.  Lawler.   (Incorporated   by
                           reference  to Exhibit  99.2 to the  Issuer's  Current
                           Report on Form 8-K filed on September 22, 1999,  File
                           No. 0-24509.)

             99.3          Investors Agreement dated September 13, 1999 between
                           Allegiance Telecom, Inc. and Vulcan Ventures
                           Incorporated. (Incorporated by reference to Exhibit
                           99.3 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.4          Amended and  Restated  Registration  Agreement  dated
                           September 13, 1999 among  Allegiance  Telecom,  Inc.,
                           Battery Ventures IV L.P., Battery Investment Partners
                           IV, LLC, Frontenac VII Limited Partnership, Frontenac
                           Masters VII  Limited  Partnership,  Madison  Dearborn
                           Capital  Partners  II L.P.,  Morgan  Stanley  Capital
                           Partners III,  L.P.,  MSCP III 892  Investors,  L.P.,
                           Morgan  Stanley  Capital   Investors,   L.P.,  Vulcan
                           Ventures  Incorporated and certain other stockholders
                           listed therein. (Incorporated by reference to Exhibit
                           99.4 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.5          Joint Filing Statement filed on September 23, 1999.

             99.6          Power of Attorney (Incorporated   by reference to the
                           Reporting   Persons'  Schedule  13G for  Pathogenesis
                           Corporation filed August 30, 1999.)

                                  Page 6 of 8
<PAGE>




                                   SIGNATURES

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

                                       VULCAN VENTURES INCORPORATED


November 4, 1999                      By: /s/ William D. Savoy
                                            ----------------------------------
                                            William D. Savoy, Vice President



November 4, 1999                        *
                                      ----------------------------------------
                                      Paul G. Allen

                                     *By: /s/ Paul G. Allen by William D. Savoy
                                            ----------------------------------
                                            William D. Savoy, Attorney-in-Fact


                                  Page 7 of 8

<PAGE>





                                  EXHIBIT INDEX

           Exhibit         Description

             99.1          Common  Stock  Purchase  and Option  Agreement  dated
                           August  3,  1999  among  Madison   Dearborn   Capital
                           Partners II L.P.,  Frontenac VII Limited Partnership,
                           Frontenac  Masters VII Limited  Partnership,  Battery
                           Ventures IV L.P., and Battery Investment Partners IV,
                           LLC,  Allegiance  Telecom,  Inc. and Vulcan  Ventures
                           Incorporated.  (Incorporated  by reference to Exhibit
                           99.1 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.2          Counterpart  Agreement,  dated  as of  September  13,
                           1999,  among Madison  Dearborn  Capital  Partners II,
                           L.P.,  Frontenac VII Limited  Partnership,  Frontenac
                           Masters VII Limited Partnership, Battery Ventures IV,
                           L.P.,  Battery  Investment  Partners IV, LLC, Reed E.
                           Hundt  and  Gregory  E.  Lawler.   (Incorporated   by
                           reference  to Exhibit  99.2 to the  Issuer's  Current
                           Report on Form 8-K filed on September 22, 1999,  File
                           No. 0-24509.)

             99.3          Investors Agreement dated September 13, 1999 between
                           Allegiance   Telecom,   Inc.  and   Vulcan   Ventures
                           Incorporated. (Incorporated  by  reference to Exhibit
                           99.3 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.4          Amended and  Restated  Registration  Agreement  dated
                           September 13, 1999 among  Allegiance  Telecom,  Inc.,
                           Battery Ventures IV L.P., Battery Investment Partners
                           IV, LLC, Frontenac VII Limited Partnership, Frontenac
                           Masters VII  Limited  Partnership,  Madison  Dearborn
                           Capital  Partners  II L.P.,  Morgan  Stanley  Capital
                           Partners III,  L.P.,  MSCP III 892  Investors,  L.P.,
                           Morgan  Stanley  Capital   Investors,   L.P.,  Vulcan
                           Ventures  Incorporated and certain other stockholders
                           listed therein. (Incorporated by reference to Exhibit
                           99.4 to the Issuer's Current Report on Form 8-K filed
                           on September 22, 1999, File No. 0-24509.)

             99.5          Joint Filing Statement (Previously filed on September
                           23, 1999.)

             99.6          Power of  Attorney (Incorporated by  reference to the
                           Reporting  Persons'  Schedule  13G  for  Pathogenesis
                           Corporation filed August 30, 1999.)

                                   Page 8 of 8




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