HICKS THOMAS O
SC 13D/A, 2000-07-25
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                 SCHEDULE 13D/A
                    Under the Securities Exchange Act of 1934
                                (Amendment No. 1)

                            ICG Communications, Inc.

                                (Name of Issuer)


                     Common Stock, par value $0.01 per share

                         (Title of Class of Securities)


                                    449246107

                                 (CUSIP Number)


                                 Thomas O. Hicks
                   c/o Hicks, Muse, Tate & Furst Incorporated
                               200 Crescent Court
                                   Suite 1600
                               Dallas, Texas 75201
                                 (214) 740-7300

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


                                   Copies to:

                                  Eric S. Shube
                             Vinson & Elkins, L.L.P.
                           1325 Avenue of the Americas
                            New York, New York 10019
                                 (917) 206-8005

                                 June 29, 2000

             (Date of Event which Requires Filing of this Statement)

     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box. [ ]




                         (Continued on following pages)


<PAGE>   2
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    Mr. Thomas O. Hicks
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY
                                                                             N/A
--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                           United States

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                              11,428,810
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                         11,428,810


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                      11,428,810
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          19.03%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              IN
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   3
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM4 ICG Qualified Fund, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION
                                                                        Delaware
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                               5,199,664
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                          5,199,664


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,199,664
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           9.66%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   4
                                  SCHEDULE 13D

CUSIP NO.449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HMTF Equity Fund IV (1999), L.P.
------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*(SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)
                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                   Texas

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                               5,199,664
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                          5,199,664


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,199,664
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           9.66%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   5
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM4 ICG Private Fund, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*(SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e) [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                Delaware

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                                  36,789
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                             36,789


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                          36,789
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.08%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   6
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HMTF Private Equity Fund IV (1999), L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                   Texas

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                                  36,789
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                             36,789


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                          36,789
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.08%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   7
                                  SCHEDULE 13D

CUSIP NO.

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM4/GP (1999) Partners, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                   Texas

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                               5,236,454
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
10   SHARED DISPOSITIVE POWER*                                         5,236,646


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,236,454
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           9.72%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   8
                                  SCHEDULE 13D

CUSIP NO.

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM 4-EQ ICG Coinvesters, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                Delaware

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                                  76,492
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                             76,492


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                          76,492
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.16%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   9
                                  SCHEDULE 13D

CUSIP NO.
          449246107
--------------------------------------------------------------------------------

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM 4-EQ (1999) Coinvesters, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                   Texas

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                                  76,492
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                             76,492


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                          76,492
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.16%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   10
                                  SCHEDULE 13D

CUSIP NO.
          449246107
--------------------------------------------------------------------------------

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM 4- SBS ICG Coinvestors, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION                                Delaware

--------------------------------------------------------------------------------
                7   SOLE VOTING POWER                                          0
  NUMBER OF
   SHARES
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*                                 124,668
   EACH
 REPORTING
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER                                     0


               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*                            124,668


--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         124,668
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.26%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   11
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM 4-SBS (1999) Coinvestors, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                           Texas
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                               124,668
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         124,668
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         124,668
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)  [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.26%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   12
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    Hicks, Muse GP (1999) Partners IV, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                           Texas
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                             5,437,614
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                       5,437,614
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,437,614
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          10.06%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   13
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    Hicks, Muse (1999) Fund IV, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                           Texas
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                             5,437,614
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                       5,437,614
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,437,614
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          10.06%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   14
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM PG-IV ICG, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                        Delaware
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
 REPORTING
   EACH                                                                  276,790
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         276,790
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         276,790
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.57%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   15
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    Hicks, Muse PG-IV (1999), C.V.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                     Netherlands
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                               276,790
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         276,790
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         276,790
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.57%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   16
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM Equity Fund IV/GP Partners (1999), C.V.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                     Netherlands
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                               276,790
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         276,790
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         276,790
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.57%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   17
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM GP Partners IV Cayman, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                  Cayman Islands
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                               276,790
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         276,790
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         276,790
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.57%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   18
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM Fund IV Cayman LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)*

                                                                        (a)  [ ]
                                                                        (b)  [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              00
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                  Cayman Islands
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                               276,790
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                         276,790
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                         276,790
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                           0.57%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              00
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   19
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HMTF Bridge ICG, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                        Delaware
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                             5,714,405
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                       5,714,405
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,714,405
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          10.51%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   20
                                  SCHEDULE 13D

CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HMTF Bridge Partners, L.P.
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [X]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                        Delaware
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                             5,714,405
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                       5,714,405
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,714,405
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          10.51%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              PN
--------------------------------------------------------------------------------
*    The Reporting Person expressly disclaims (a) the existence of any group
     and (b) beneficial ownership with respect to any shares other than the
     shares owned of record by such reporting person.

**   Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
     beneficially owned by such reporting person, but without giving effect to
     the conversion into Common Stock of (a) any 8% Series A Convertible
     Preferred Stock held by other holders or (b) any capital stock held by
     other holders and (2) exercise of all five-year Common Stock warrants
     beneficially owned by such reporting person, but without giving effect to
     the exercise of any warrants held by other holders.

<PAGE>   21
CUSIP NO. 449246107

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

1   NAME OF REPORTING PERSONS.
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

    HM Bridge Partners, LLC
--------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                                         (a) [ ]

                                                                         (b) [x]
--------------------------------------------------------------------------------
3   SEC USE ONLY

--------------------------------------------------------------------------------
4   SOURCE OF FUNDS (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------
5   CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d)
    OR 2(e)                                                                  [ ]
--------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                                                           Texas
--------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES                                                                      0
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER*
   EACH
 REPORTING                                                             5,714,405
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                                                                               0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER*

                                                                       5,714,405
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON**

                                                                       5,714,405
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
     (SEE INSTRUCTIONS)                                                      [ ]
--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                                                          10.51%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                                                                              OO
--------------------------------------------------------------------------------

*        The Reporting Person expressly disclaims (a) the existence of any group
         and (b) beneficial ownership with respect to any shares other than the
         shares owned of record by such reporting person.

**       Assuming (1) conversion of all 8% Series A Convertible Preferred Stock
         beneficially owned by such reporting person, but without giving effect
         to the conversion into Common Stock of (a) any 8% Series A Convertible
         Preferred Stock held by other holders or (b) any capital stock held by
         other holders and (2) exercise of all five-year Common Stock warrants
         beneficially owned by such reporting person, but without giving effect
         to the exercise of any warrants held by other holders.
<PAGE>   22

                                  SCHEDULE 13D

         This Statement constitutes Amendment No. 1 to the Schedule 13D
originally filed with the Securities and Exchange Commission on April 20, 2000
(the "Schedule 13D"). The Schedule 13D relates to the Common Stock, par value
$0.01 per share ("Common Stock") of ICG Communications, Inc., a Delaware
corporation (the "Issuer"). The item numbers and responses thereto below are in
accordance with the requirements of Schedule 13D.

         Capitalized terms used herein and not defined have the meaning set
forth in the Schedule 13D.

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

         Item 3 of the Schedule 13D is hereby amended and restated in its
entirety to read as follows:

         As more fully described in Item 6 below, on April 10, 2000, Bridge LLC,
Qualified LLC, Private LLC, PG-IV LLC, 4-SBS LLC and 4-EQ LLC each purchased
from the Issuer the number of shares of Preferred Stock and the number of
Warrants set forth opposite their respective names below at the purchase price
set forth opposite their respective names below.

<TABLE>
<CAPTION>
--------------------     ---------------     ---------------     ---------------
                         Number of shares      Number of
                         of Preferred           Warrants            Purchase
Name of entity           Stock purchased       purchased              Price
--------------------     ---------------     ---------------     ---------------
<S>                      <C>                 <C>                 <C>
Qualified LLC                     10,464           1,395,253     $   104,644,000
Private LLC                           74               9,885     $       741,000
4-EQ LLC                             154              20,502     $     1,538,000
4-SBS LLC                            251              33,412     $     2,506,000
PG-IV LLC                            557              74,281     $     5,571,000
Bridge LLC                        11,500           1,533,334     $   115,000,000
--------------------     ---------------     ---------------     ---------------
</TABLE>



<PAGE>   23

         Qualified LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by Equity
L.P.; Equity L.P. obtained such funds from capital contributions provided by its
limited partners and HM4/GP Partners; HM4/GP Partners obtained such funds from
capital contributions provided by its limited partners and Hicks GP Partners;
and Hicks GP Partners obtained such funds from capital contributions provided by
its limited partners and Fund IV LLC. Fund IV LLC obtained such funds from
capital contributions provided by Mr. Thomas O. Hicks, who obtained such funds
from personal funds.

         Private LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by Private
L.P.; Private L.P. obtained such funds from capital contributions provided by
its limited partners and HM4/GP Partners; HM4/GP Partners obtained such funds
from capital contributions provided by its limited partners and Hicks GP
Partners; and Hicks GP Partners obtained such funds from capital contributions
provided by its limited partners and Fund IV LLC. Fund IV LLC obtained such
funds from capital contributions provided by Mr. Thomas O. Hicks, who obtained
such funds from personal funds.

         4-EQ LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by 4-EQ
L.P.; 4-EQ L.P. obtained such funds from capital contributions provided by its
limited partners and Hicks GP Partners, and Hicks GP Partners obtained such
funds from capital contributions provided by its limited partners and Fund IV
LLC. Fund IV LLC obtained such funds from capital contributions provided by Mr.
Thomas O. Hicks, who obtained such funds from personal funds.

         4-SBS LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by 4-SBS
L.P.; 4-SBS L.P. obtained such funds from capital contributions provided by its
limited partners and Hicks GP Partners, and Hicks GP Partners obtained such
funds from capital contributions provided by its limited partners and Fund IV
LLC. Fund IV LLC obtained such funds from capital contributions provided by Mr.
Thomas O. Hicks, who obtained such funds from personal funds.

         PG-IV LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by PG-IV
C.V.; PG-IV C.V. obtained such funds from capital contributions provided by its
limited partners and HM Equity C.V.; HM Equity C.V. obtained such funds from
capital contributions provided by its limited partners and G.P. Cayman L.P.; and
G.P. Cayman L.P. obtained such funds from capital contributions provided by its
limited partners and Fund IV Cayman LLC. Fund IV Cayman LLC obtained such funds
from capital contributions provided by Mr. Thomas O. Hicks, who obtained such
funds from personal funds.


<PAGE>   24


         Bridge LLC obtained funds for the purchase price of its shares of
Preferred Stock and its Warrants from capital contributions provided by Bridge
Partners L.P.; Bridge Partners L.P. obtained $3,489,230.00 of such funds from
capital contributions provided by its general partner, Bridge Partners LLC, and
its limited partners, and it obtained the remainder of the funds,
$114,735,029.39 (including fees), from borrowing under a credit agreement dated
December 28, 1999, among HMTF Partners, L.P. and HM/Europe Coinvestors, C.V., as
Initial Borrowers, and any Future Borrowers from time to time parties thereto,
the Lenders from time to time parties thereto, the Issuing Bank, The Chase
Manhattan Bank, as Administrative Agent, and Bank of America, N.A., as
Syndication Agent ("Credit Agreement"). On June 29, 2000, Bridge Partners L.P.
repaid the borrowing under the Credit Agreement with the proceeds of loans
provided by Qualified LLC, Private LLC, 4-EQ LLC, 4-SBS LLC and PG-IV LLC.
Demand Notes issued by Bridge LLC in connection with such loans are filed
herewith as Exhibit 10.7 and are incorporated herein by reference. Bridge LLC
intends, subject to the expiration of any applicable waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, to sell its shares of
Preferred Stock and Warrants to Qualified LLC, Private LLC, 4-EQ LLC, 4-SBS LLC
and PG-IV LLC, and such entities intend to purchase such securities. Bridge LLC
expects to use the proceeds of such sales to repay such loans.

         Bridge Partners LLC obtained the funds it contributed to Bridge
Partners L.P. from capital contributions provided by Mr. Thomas O. Hicks, who
obtained such funds from personal funds.

Item 4.  Purpose of the Transaction.

         Item 4 of the Schedule 13D is hereby amended and restated in its
entirety to read as follows:

         The Reporting Persons consummated the transactions described herein in
order to acquire an interest in the Issuer for investment purposes. The
Reporting Persons intend to review continuously their position in the Issuer.
Depending upon future evaluations of the business prospects of the Issuer and
upon other developments, including, but not limited to, general economic and
business conditions and stock market conditions, the Reporting Persons may
retain or from time to time increase their holdings or dispose of all or a
portion of their holdings, subject to any applicable legal and contractual
restrictions on their ability to do so.

         In addition, the matters set forth in Item 6 are incorporated in this
Item 4 by reference as if fully set forth herein.


<PAGE>   25

         Subject to the expiration of any applicable waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, Bridge LLC intends to sell
its shares of Preferred Stock and Warrants to Qualified LLC, Private LLC, 4-EQ
LLC, 4-SBS LLC and PG-IV LLC, and such entities intend to purchase such
securities, as set forth below:

<TABLE>
<CAPTION>
Name of entity            Number of shares             Number of
                         of Preferred Stock             Warrants
                          to be purchased            to be purchased
--------------------     ------------------          ---------------
<S>                      <C>                         <C>
Qualified LLC                        10,464                1,395,254
Private LLC                              74                    9,885
4-EQ LLC                                154                   20,502
4-SBS LLC                               251                   33,412
PG-IV LLC                               557                   74,281
--------------------     ------------------          ---------------
</TABLE>

         Except as set forth in this Item 4 (including the matters described in
Item 6 below which are incorporated in this Item 4 by reference), the Reporting
Persons have no present plans or proposals that relate to or that would result
in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule
13D of the Exchange Act.

Item 5.  Interest in Securities of the Issuer.

         Item 5 of the Schedule 13D is hereby amended and restated in its
entirety to read as follows:

         All beneficial ownership amounts set forth below give effect to the
accretion of dividends through June 30, 2000, but do not give effect to the
anticipated transfer by Bridge LLC of its shares of Preferred Stock and
Warrants.

         (a) (1) Qualified LLC is the record and beneficial owner of 10,464
shares of Preferred Stock and 1,395,253 Warrants. Assuming conversion of all
such shares of Preferred Stock and exercise of all such Warrants, Qualified LLC
is the beneficial owner of 5,199,664 shares of Common Stock, which, based on
calculations made in accordance with Rule 13d-3 of the Exchange Act and, as at
May 10, 2000, there being 48,642,985 shares of Common Stock outstanding,
represents approximately 9.66% of the outstanding shares of Common Stock.

             (2) Assuming conversion of all 10,464 shares of Preferred Stock and
exercise of all 1,395,253 Warrants owned of record by Qualified LLC, Equity
L.P., in its capacity as sole member of Qualified LLC, may, pursuant to Rule
13d-3 of the Exchange Act, be deemed to be the beneficial owner of 5,199,664
shares of Common Stock, which, based on calculations made in accordance with
Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there being 48,642,985
shares of Common Stock outstanding, represents approximately 9.66% of the
outstanding shares of Common Stock.


<PAGE>   26

                  (3) Private LLC is the record and beneficial owner of 74
shares of Preferred Stock and 9,885 Warrants. Assuming conversion of all such
shares of Preferred Stock and assuming exercise of all such Warrants, Private
LLC is the beneficial owner of 36,789 shares of Common Stock, which, based on
calculations made in accordance with Rule 13d-3 of the Exchange Act and, as at
May 10, 2000, there being 48,642,985 shares of Common Stock outstanding,
represents approximately 0.08% of the outstanding shares of Common Stock..

                  (4) Assuming conversion of all 74 shares of Preferred Stock
and exercise of all 9,885 Warrants owned of record by Private LLC, Private L.P.,
in its capacity as sole member of Private LLC, may, pursuant to Rule 13d-3 of
the Exchange Act, be deemed to be the beneficial owner of 36,789 shares of
Common Stock, which, based on calculations made in accordance with Rule 13d-3 of
the Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of
Common Stock outstanding, represents approximately 0.08% of the outstanding
shares of Common Stock.

                  (5) Assuming conversion of all 10,538 shares of Preferred
Stock and exercise of all 1,405,138 Warrants owned of record by Qualified LLC
and Private LLC, HM4/GP Partners, in its capacity as the sole general partner of
each of Equity L.P. and Private L.P., may, pursuant to Rule 13d-3 of the
Exchange Act, be deemed to be the beneficial owner of 5,236,454 shares of Common
Stock, which, based on calculations made in accordance with Rule 13d-3 of the
Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of Common
Stock outstanding, represents approximately 9.72% of the outstanding shares of
Common Stock.

                  (6) 4-EQ LLC is the record and beneficial owner of 154 shares
of Preferred Stock and 20,502 Warrants. Assuming conversion of all such shares
of Preferred Stock and assuming exercise of all such Warrants, 4-EQ LLC is the
beneficial owner of 76,492 shares of Common Stock, which, based on calculations
made in accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000,
there being 48,642,985 shares of Common Stock outstanding, represents
approximately 0.16% of the outstanding shares of Common Stock.

                  (7) Assuming conversion of all 154 shares of Preferred Stock
and exercise of all 20,502 Warrants owned of record by 4-EQ LLC, 4-EQ L.P., in
its capacity as sole member of 4-EQ LLC, may, pursuant to Rule 13d-3 of the
Exchange Act, be deemed to be the beneficial owner of 76,492 shares of Common
Stock, which, based on calculations made in accordance with Rule 13d-3 of the
Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of Common
Stock outstanding, represents approximately 0.16% of the outstanding shares of
Common Stock.

                  (8) 4-SBS LLC is the record and beneficial owner of 251 shares
of Preferred Stock and 33,412 Warrants. Assuming conversion of all such shares
of Preferred Stock and exercise of all such Warrants, 4-SBS LLC is the
beneficial owner of 124,668 shares of Common Stock, which, based on calculations
made in accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000,
there being 48,642,985 shares of Common Stock outstanding, represents
approximately 0.26% of the outstanding shares of Common Stock.



<PAGE>   27

                  (9) Assuming conversion of all 251 shares of Preferred Stock
and exercise of all 33,412 Warrants owned of record by 4-SBS LLC, 4-SBS L.P., in
its capacity as sole member of 4-SBS LLC, may, pursuant to Rule 13d-3 of the
Exchange Act, be deemed to be the beneficial owner of 124,668 shares of Common
Stock, which, based on calculations made in accordance with Rule 13d-3 of the
Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of Common
Stock outstanding, represents approximately 0.26% of the outstanding shares of
Common Stock.

                  (10) Assuming conversion of all 10,943 shares of Preferred
Stock and exercise of all 1,459,052 Warrants owned of record by Qualified LLC,
Private LLC, 4-EQ LLC and 4-SBS LLC, Hicks GP Partners, in its capacity as sole
general partner of each of HM4/GP Partners, 4-EQ L.P. and 4-SBS L.P., may,
pursuant to Rule 13d-3 of the Exchange Act, be deemed to be the beneficial owner
of 5,437,614 shares of Common Stock, which, based on calculations made in
accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there
being 48,642,985 shares of Common Stock outstanding, represents approximately
10.06% of the outstanding shares of Common Stock.

                  (11) Assuming conversion of all 10,943 shares of Preferred
Stock and exercise of all 1,459,052 Warrants owned of record by Qualified LLC,
Private LLC, 4-EQ LLC and 4-SBS LLC, Fund IV LLC, in its capacity as the sole
general partner of Hicks GP Partners, may, pursuant to Rule 13d-3 of the
Exchange Act, be deemed to be the beneficial owner of 5,437,614 shares of Common
Stock, which, based on calculations made in accordance with Rule 13d-3 of the
Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of Common
Stock outstanding, represents approximately 10.06% of the outstanding shares of
Common Stock.

                  (12) PG-IV LLC is the record and beneficial owner of 557
shares of Preferred Stock and 74,281 Warrants. Assuming conversion of all such
shares of Preferred Stock and exercise of all such Warrants, PG-IV LLC is the
beneficial owner of 276,790 shares of Common Stock, which, based on calculations
made in accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000,
there being 48,642,985 shares of Common Stock outstanding, represents
approximately 0.57% of the outstanding shares of Common Stock.

                  (13) Assuming conversion of all 557 shares of Preferred Stock
and exercise of all 74,281 Warrants owned of record by PG-IV LLC, PG-IV C.V., in
its capacity as sole member of PG-IV LLC, may, pursuant to Rule 13d-3 of the
Exchange Act, be deemed to be the beneficial owner of 276,790 shares of Common
Stock, which, based on calculations made in accordance with Rule 13d-3 of the
Exchange Act and, as at May 10, 2000, there being 48,642,985 shares of Common
Stock outstanding, represents approximately 0.57% of the outstanding shares of
Common Stock.


<PAGE>   28

                  (14) Assuming conversion of all 557 shares of Preferred Stock
and exercise of all 74,281 Warrants owned of record by PG-IV LLC, HM Equity
C.V., in its capacity as sole general partner of PG-IV C.V., may, pursuant to
Rule 13d-3 of the Exchange Act, be deemed to be the beneficial owner of 276,790
shares of Common Stock, which, based on calculations made in accordance with
Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there being 48,642,985
shares of Common Stock outstanding, represents approximately 0.57% of the
outstanding shares of Common Stock.

                  (15) Assuming conversion of all 557 shares of Preferred Stock
and exercise of all 74,281 Warrants owned of record by PG-IV LLC, GP Cayman
L.P., in its capacity as sole general partner of HM Equity C.V., may, pursuant
to Rule 13d-3 of the Exchange Act, be deemed to be the beneficial owner of
276,790 shares of Common Stock, which, based on calculations made in accordance
with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there being
48,642,985 shares of Common Stock outstanding, represents approximately 0.57% of
the outstanding shares of Common Stock.

                  (16) Assuming conversion of all 557 shares of Preferred Stock
and exercise of all 74,281 Warrants owned of record by PG-IV LLC, Fund IV Cayman
LLC, in its capacity as the sole general partner of GP Cayman L.P. may, pursuant
to Rule 13d-3 of the Exchange Act, be deemed to be the beneficial owner of
276,790 shares of Common Stock, which, based on calculations made in accordance
with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there being
48,642,985 shares of Common Stock outstanding, represents approximately 0.57% of
the outstanding shares of Common Stock.

                  (17) Bridge LLC is the record and beneficial owner of 11,500
shares of Preferred Stock and, 1,533,334 Warrants. Assuming conversion of all
such shares and exercise of all such Warrants, Bridge LLC is the beneficial
owner of 5,714,405 shares of Common Stock, which, based on calculations made in
accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there
being 48,642,985 shares of Common Stock outstanding, represents approximately
10.51% of the outstanding shares of Common Stock.

                  (18) Assuming conversion of all 11,500 shares of Preferred
Stock and exercise of all 1,533,334 Warrants owned of record by Bridge LLC,
Bridge Partners L.P., in its capacity as sole member of Bridge LLC, may,
pursuant to Rule 13d-3 of the Exchange Act, be deemed to be the beneficial owner
of 5,714,405 shares of Common Stock, which, based on calculations made in
accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there
being 48,642,985 shares of Common Stock outstanding, represents approximately
10.51% of the outstanding shares of Common Stock.

                  (19) Assuming conversion of all 11,500 shares of Preferred
Stock and exercise of all 1,533,334 Warrants owned of record by Bridge LLC,
Bridge Partners LLC, in its capacity as general partner of Bridge Partners L.P.,
may, pursuant to Rule 13d-3 of the Exchange Act, be deemed to be the beneficial
owner of 5,714,405 shares of Common Stock, which, based on calculations made in
accordance with Rule 13d-3 of the Exchange Act and, as at May 10, 2000, there
being 48,642,985 shares of Common Stock outstanding, represents approximately
10.51% of the outstanding shares of Common Stock.


<PAGE>   29

                  (20) Assuming conversion of all 23,000 shares of Preferred
Stock and exercise of all 3,066,667 Warrants owned of record by Qualified LLC,
Private LLC, 4-EQ LLC, 4-SBS LLC, PG-IV LLC and Bridge LLC, Mr. Thomas O. Hicks,
in his capacity as sole member of Fund IV LLC, Fund IV Cayman LLC and Bridge
Partners LLC, may, pursuant to Rule 13d-3 of the Exchange Act, be deemed to be
the beneficial owner of 11,428,810 shares of Common Stock, which, based on
calculations made in accordance with Rule 13d-3 of the Exchange Act and, as at
May 10, 2000, there being 48,642,985 shares of Common Stock outstanding,
represents approximately 19.03% of the outstanding shares of Common Stock.

         The Reporting Persons expressly disclaim (a) the existence of any group
and (b) beneficial ownership with respect to any shares other than the shares
owned of record by such Reporting Person.


         (b) The information set forth in Items 7 through 11 of the cover pages
hereto is incorporated herein by reference.

         (c) Except as set forth herein, none of the persons named in response
to paragraph (a) has effected any transactions in shares of Common Stock during
the past 60 days.

         (d) The right to receive dividends on, and proceeds from the sale of,
the shares of Common Stock which may be beneficially owned by the persons
described in (a) and (b) above is governed by the limited liability company
agreements and limited partnership agreements of each such entity, and such
dividends or proceeds may be distributed with respect to numerous member
interests and general and limited partnership interests.

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

         Item 6 of the Schedule 13D is hereby amended and restated in its
entirety to read as follows:

         The matters set forth in Item 2 are incorporated in this Item 6 by
reference as if fully set forth herein.



<PAGE>   30

         Securities Purchase Agreement

         Pursuant to the Preferred Stock and Warrant Purchase Agreement (as
amended by the Amendment Agreement referred to below, the "Securities Purchase
Agreement"), dated as of February 27, 2000 between the Issuer, Liberty Media
Corporation, Gleacher/ICG Investors, LLC and Bridge LLC, the Issuer agreed,
inter alia, to sell to Bridge LLC, and Bridge LLC agreed to purchase from the
Issuer, 230,000 shares of Preferred Stock and 3,066,667 Warrants for a purchase
price of $230,000,000. Prior to the issuance of the shares of Preferred Stock
and Warrants at the Closing (as defined below), pursuant to an Assignment of
Rights Under Preferred Stock and Warrant Purchase Agreement dated February 16,
2000 (the "Assignment Agreement"), Bridge LLC assigned 50% of its rights,
titles, interests and obligations in, to and under the Securities Purchase
Agreement to Qualified LLC, Private LLC, 4-EQ LLC, 4-SBS LLC and PG-IV LLC (the
"Assignees").

         The number of shares of Preferred Stock to be sold to Bridge LLC and
the Assignees was reduced to 23,000 and the Liquidation Preference of each share
was increased from $1,000 to $10,000 (with no change to the aggregate purchase
price) by way of an Amendment, Consent and Waiver dated April 10, 2000
("Amendment Agreement"). The number of shares to be sold to the other purchasers
under the Securities Purchase Agreement was also correspondingly reduced.
Pursuant to the Amendment Agreement, the parties also agreed to redesignate the
Preferred Stock such that Liberty Media Corporation would be issued Series A-1
Preferred Stock, Bridge LLC and the Assignees would be issued Series A-2
Preferred Stock and Gleacher/ICG Investors, LLC would be issued Series A-3
Preferred Stock. Unless the context otherwise requires, references herein to the
"Preferred Stock" shall mean, collectively, the Series A-1 Preferred Stock,
Series A-2 Preferred Stock and Series A-3 Preferred Stock.


<PAGE>   31



         On April 10, 2000 at the closing held pursuant to the Securities
Purchase Agreement (the "Closing"), the Issuer sold to each of the persons
listed below (the "HMTF Holders") the number of shares of Preferred Stock and
the number of Warrants set forth opposite such person's name below in exchange
for the purchase price set forth opposite such person's name below.

<TABLE>
<CAPTION>
                         Number of shares         Number of
                         of Preferred Stock       Warrants                       Purchase
Name of entity           purchased                purchased                       Price
--------------------     --------------------     --------------------     --------------------
<S>                      <C>                      <C>                      <C>
Qualified LLC                          10,464                1,395,253     $        104,644,000
Private LLC                                74                    9,885     $            741,000
4-EQ LLC                                  154                   20,502     $          1,538,000
4-SBS LLC                                 251                   33,412     $          2,506,000
PG-IV LLC                                 557                   74,281     $          5,571,000
Bridge LLC                             11,500                1,533,334     $        115,000,000
</TABLE>

         The foregoing description of the Securities Purchase Agreement is not,
and does not purport to be, complete and is qualified in its entirety by
reference to the Stock Purchase Agreement, a copy of which is filed as Exhibit
10.1 to the Schedule 13D and is incorporated herein by reference and the
Amendment, Consent and Waiver, a copy of which is filed as Exhibit 10.2 to the
Schedule 13D and is incorporated herein by reference.

         Registration Rights Agreement

         At Closing, the Issuer and the holders of Preferred Stock entered into
a Registration Rights Agreement (the "Registration Rights Agreement"), pursuant
to which the Issuer has agreed to effect three "demand" registrations at the
request of the holders of a majority of the Registrable Securities held by the
HMTF Holders and any direct or indirect transferee of any Registrable Securities
held by the HMTF Holders, provided that each such demand registration must be in
respect of Registrable Securities (as defined below) with a fair market value of
at least $50,000,000 and provided that certain other restrictions are met. The
HMTF Holders may make one additional demand for registration upon exercise of
all or a portion of the Warrants held by them. The Registration Rights Agreement
also grants demand registration rights to holders of Registrable Securities
affiliated with Liberty Media Corporation. In addition, the purchasers have
certain piggyback registration rights in connection with registrations of the
Issuer's securities under the Securities Act of 1933 (the "Securities Act") as
well as rights to request a shelf registration of portions of the Registrable
Securities.


<PAGE>   32

         "Registrable Securities" means (a) the shares of Common Stock issued or
issuable upon conversion of the Preferred Stock or upon exercise of the
Warrants, plus any additional shares of Common Stock or Warrants issued in
connection with any stock split, stock dividend or similar event with respect to
the Common Stock and (b) any securities that the Issuer or any successor entity
into which such Common Stock or such Preferred Stock may be converted or
changed.

         The foregoing description of the Registration Rights Agreement is not,
and does not purport to be, complete and is qualified in its entirety by
reference to the Registration Rights Agreement, a copy of which is filed as
Exhibit 10.3 to the Schedule 13D and is incorporated herein by reference.


<PAGE>   33



         Certificate of Designation

         As contemplated by the Securities Purchase Agreement, the Board of
Directors of the Issuer approved and adopted the Certificate of Designation of
the Powers, Preferences and Relative, Participating, Optional and Other Special
Rights of 8% Series A-1 Convertible Preferred Stock, 8% Series A-2 Convertible
Preferred Stock and 8% Series A-3 Convertible Preferred Stock, and
Qualifications, Limitations and Restrictions Thereof (the "Certificate of
Designation") to create three series of Preferred Stock. Except in relation to
director appointment rights, the powers, preferences and relative,
participating, optional and other special rights of each series of Preferred
Stock are identical.

         Under the Certificate of Designation, the shares of Preferred Stock
will, with respect to dividend rights and rights on liquidation, winding-up and
dissolution, rank (i) senior to all shares of Common Stock and to each other
class of capital stock or preferred stock of the Issuer (other than Preferred
Stock Mandatorily Redeemable 2009 of the Issuer), the terms of which do not
expressly provide that it ranks senior to or on a parity with the shares of the
Preferred Stock as to dividend rights and rights on liquidation, winding-up and
dissolution of the Issuer; (ii) on a parity with the Preferred Stock Mandatorily
Redeemable 2009 of the Issuer and with each other class of capital stock or
series of preferred stock of the Issuer issued by Issuer, the terms of which
expressly provide that such class or series will rank on a parity with the
shares of the Preferred Stock as to dividend rights and rights on liquidation,
winding-up and dissolution, if the Issuer, in issuing the shares, complies with
applicable provisions in the Certificate of Designation; and (iii) junior to
each class of capital stock or series of preferred stock of the Issuer issued by
the Issuer, the terms of which expressly provide that such class or series will
rank senior to the shares of Preferred Stock as to dividend rights and rights
upon liquidation, winding-up and dissolution, if the Issuer, in issuing the
shares, complies with applicable provisions in the Certificate of Designation.

         The holders of the shares of Preferred Stock will be entitled to
receive with respect to each share of Preferred Stock, out of funds legally
available for the payment of dividends, dividends at a rate per annum of 8% of
the then-effective Liquidation Preference (as defined below). Such dividends
shall be cumulative from the date of issuance of the Preferred Stock and shall
be payable quarterly in arrears. On each Dividend Payment Date, commencing on
the June 30, 2000 Dividend Payment Date, to and including the June 30, 2005
Dividend Payment Date, accrued dividends on a share of Preferred Stock for the
preceding Dividend Period shall be added cumulatively to and thereafter remain a
part of the Liquidation Preference of such share. Thereafter, accrued dividends
shall be payable quarterly on each Dividend Payment Date, commencing on
September 30, 2005, to the holders of record of Preferred Stock as of the close
of business on the applicable Dividend Record Date. Accrued Dividends that are
not paid in full in cash on any Dividend Payment Date (whether or not declared
and whether or not there are sufficient funds legally available for the payment
thereof) shall be added cumulatively to the Liquidation Preference on the
applicable Dividend Payment Date and thereafter remain a part thereof.




<PAGE>   34


         The holders of shares of Preferred Stock will have the right,
generally, at any time, to convert any or all their shares of Preferred Stock
into a number of fully paid and nonassessable shares of Common Stock equal to
the then effective Liquidation Preference thereof plus accrued and unpaid
dividends to the date of conversion divided by the Conversion Price in effect at
the time of conversion. The initial Conversion Price is $28.00 per share.

         The shares of Preferred Stock may be redeemed at any time commencing on
or after June 30, 2000, in whole or from time to time in part, at the election
of the Issuer, at a redemption price payable in cash equal to 100% of the then
effective Liquidation Preference (after giving effect to the Special Dividend
(as defined in the Certificate of Designation) if applicable) plus accrued and
unpaid dividends from the last Dividend Payment Date to the date fixed for
redemption. Shares of Preferred Stock (if not earlier redeemed or converted)
shall be mandatorily redeemed by the Issuer on June 30, 2015, at a redemption
price per share in cash equal to the then effective Liquidation Preference
(after giving effect to the Special Dividend, if applicable), plus accrued and
unpaid dividends thereon from the last Dividend Payment Date to the date of
mandatory redemption.

         If a "Change of Control" (as defined in the Certificate of Designation)
occurs prior to June 30, 2005, an amount equal to the Special Dividend is to be
added to the Liquidation Preference of each share of Preferred Stock. The
Special Dividend, for each share of Preferred Stock, is the difference between
(i) $14,859.47 (as that number may be adjusted for stock splits, stock dividends
or similar events) and (ii) the amount of the actual Liquidation Preference of
such share immediately prior to the Change of Control.

         Upon occurrence of a Change of Control, the Issuer has the right, but
not the obligation, to offer to repurchase all the shares of Preferred Stock at
a purchase price per share in cash equal to 101% of the Liquidation Preference
of each share of Preferred Stock repurchased (after giving effect to the Special
Dividend, if applicable), plus an amount equal to 101% of all dividends accrued
and unpaid thereon to the date fixed for the repurchase. If the Issuer does not
offer to repurchase all the shares of Preferred Stock in accordance with the
Certificate of Designation, the dividend rate on the Preferred Stock will
increase to 16%. If the dividend rate is so increased, the Issuer will have the
right (but not the obligation) (i) at any time prior to June 30, 2005 to offer
to repurchase all the shares of Preferred Stock at a purchase price per share in
cash equal to 101% of the Liquidation Preference of each share of Preferred
Stock repurchased (after giving effect to the Special Dividend, if applicable),
plus an amount equal to 101% of all dividends accrued and unpaid thereon to the
date fixed for the repurchase and (ii) at any time after June 30, 2005, to offer
to repurchase all the shares of Preferred Stock at a purchase price per share in
cash equal to 100% of the Liquidation Preference of each share of Preferred
Stock repurchased (after giving effect to the Special Dividend, if applicable),
plus an amount equal to 100% of all dividends accrued and unpaid thereon to the
date fixed for the repurchase. If the Issuer makes such an offer, the dividend
rate on the Preferred Stock will be thereafter reduced to 8%.



<PAGE>   35

         The holders of the shares of Preferred Stock will be entitled to vote
on all matters that the holders of the Issuer's Common Stock are entitled to
vote upon. In exercising these voting rights, each share of Preferred Stock
shall be entitled to vote on an as-converted basis with the holders of the
Issuer's Common Stock. The approval of the holders of between 51% and 75% the
then-outstanding shares of Preferred Stock, voting as one class, will be
required for the Issuer to take certain actions. In addition, for so long as
members of the HMTF Group own any combination of the shares of Common Stock (on
an as converted basis) that, taken together, equal at least 4,107,143 shares of
Common Stock (as adjusted for any stock dividends, splits and combinations and
similar events affecting the Common Stock from time to time), the holders of
Series A-2 Preferred Stock, voting as a class, may elect one director, or if
greater, such number (rounded up to the nearest whole number) equal to 10% of
the then authorized number of members of members of the Issuer's board of
directors, to serve on the board of directors of the Issuer. Pursuant to this
right, the holders of the Series A-2 Preferred Stock have elected Thomas O.
Hicks to the board of directors of the Issuer. The Securities Purchase Agreement
contains a parallel provision for the election of a director that is inoperative
for so long as the above described provision is in effect. Pursuant to the
Certificate of Designation, holders of the Series A-1 Preferred Stock have the
right to elect up to two directors under certain circumstances.

         "Liquidation Preference" means an amount equal to $10,000 per share of
Preferred Stock plus accrued and unpaid dividends, subject to change in
accordance with the provisions of the Certificate of Designation.

         The foregoing description is not, and does not purport to be, complete
and is qualified in its entirety by reference to the Certificate of Designation,
a copy of which is filed as Exhibit 10.4 to the Schedule 13D and is incorporated
herein by reference.

         Common Stock Warrant Certificate

         As contemplated by the Securities Purchase Agreement, at the Closing
the Issuer issued the Warrants. The Warrants entitle the HMTF Holders or their
permitted assigns to purchase from the Issuer fully paid and nonassessable
shares of Common Stock at an exercise price of $34.00 per share, as adjusted
from time to time pursuant to the terms of the Warrant Certificate. The Warrants
are void after April 10, 2005. Warrants were also issued to the other
purchasers.

         The foregoing description of the Warrants is not, and does not purport
to be, complete and is qualified in its entirety by reference to the form of
Common Stock Warrant, a copy of which is filed as Exhibit 10.5 to the Schedule
13D and is incorporated herein by reference.



<PAGE>   36

         Borrowings under Credit Agreement

         On June 29, 2000, Bridge Partners L.P. repaid the borrowing under the
Credit Agreement referred to in Item 3 with the proceeds of loans provided by
Qualified LLC, Private LLC, 4-EQ LLC, 4-SBS LLC and PG-IV LLC. Demand Notes
issued by Bridge LLC in connection with such loans are filed herewith as Exhibit
10.7 and are incorporated herein by reference. Bridge LLC intends, subject to
the expiration of any applicable waiting period under the Hart-Scott-Rodino
Antitrust Improvements Act of 1976, to sell its shares of Preferred Stock and
Warrants to Qualified LLC, Private LLC, 4-EQ LLC, 4-SBS LLC and PG-IV LLC and
use the proceeds of such sales to repay such loans.

         Proposed Sale of Shares of Preferred Stock and Warrants by Bridge LLC

         Subject to the expiration of any applicable waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, Bridge LLC intends to sell
its shares of Preferred Stock and Warrants to Qualified LLC, Private LLC, 4-EQ
LLC, 4-SBS LLC and PG-IV LLC, and such entities intend to purchase such
securities, as set forth below:

<TABLE>
<CAPTION>
                         Number of shares         Number of
                         of Preferred Stock       Warrants
Name of entity           to be purchased          to be purchased
--------------------     --------------------     --------------------
<S>                      <C>                      <C>
Qualified LLC                          10,464                1,395,254
Private LLC                                74                    9,885
4-EQ LLC                                  154                   20,502
4-SBS LLC                                 251                   33,412
PG-IV LLC                                 557                   74,281
</TABLE>

         The purchase price for the shares of Preferred Stock and Warrants sold
by Bridge LLC will be equal to the original purchase price paid therefor by
Bridge LLC together with an allocable portion of the interest and other expenses
incurred by Bridge LLC under the Credit Agreement referred to in Item 3.


Item 7.  Material to be Filed as Exhibits.

Exhibit 10.7: Demand Notes issued by Bridge LLC to Qualified LLC, Private LLC,
4-EQ LLC, 4-SBS LLC and PG-IV LLC.



<PAGE>   37
                                    SIGNATURE

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

July 25, 2000                            By: /s/ David W. Knickel*
                                              ----------------------
                                         Name:   Thomas O. Hicks

                                           *By:  David W. Knickel
                                                 Attorney-in-Fact


<PAGE>   38
                                    SIGNATURE

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

July 25, 2000                            HM4 ICG QUALIFIED FUND, LLC


                                         By: /s/ David W. Knickel
                                              ----------------------
                                         Name: David W. Knickel
                                         Title: Vice President


<PAGE>   39
                                    SIGNATURE

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

July 25, 2000                            HMTF EQUITY FUND IV (1999), L.P.


                                           By: HM4/GP (1999) Partners, L.P., its
                                              General Partner

                                           By: Hicks, Muse GP (1999) Partners
                                              IV, L.P., its General Partner

                                           By: Hicks, Muse (1999) Fund IV, LLC,
                                              its General Partner


                                          By: /s/ David W. Knickel
                                             ---------------------
                                          Name: David W. Knickel
                                          Title: Vice President
<PAGE>   40
                                    SIGNATURE

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

July 25, 2000                           HM4 ICG PRIVATE FUND, LLC


                                        By: /s/ David W. Knickel
                                           ----------------------------
                                        Name:   David W. Knickel
                                        Title:  Vice President
<PAGE>   41
                                    SIGNATURE

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

July 25, 2000                             HM4/GP (1999) PARTNERS, L.P.

                                          By: Hicks, Muse GP (1999) Partners
                                             IV, L.P., its General Partner

                                          By: Hicks, Muse (1999) Fund IV, LLC,
                                             its General Partner

                                        By: /s/ David W. Knickel
                                           ----------------------------
                                        Name: David W. Knickel
                                        Title: Vice President
<PAGE>   42
                                    SIGNATURE

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

July 25, 2000                           HMTF PRIVATE EQUITY FUND IV (1999), L.P.

                                          By: HM4/GP (1999) Partners, L.P., its
                                              General Partner

                                          By: Hicks, Muse GP (1999) Partners
                                              IV, L.P., its General Partner

                                          By: Hicks, Muse (1999) Fund IV, LLC,
                                              its General Partner


                                         By: /s/ David W. Knickel
                                           ----------------------------
                                         Name: David W. Knickel
                                         Title: Vice President
<PAGE>   43
                                    SIGNATURE

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

July 25, 2000                           HM 4-EQ ICG COINVESTORS, LLC


                                        By: /s/ David W. Knickel
                                           ----------------------------
                                        Name:   David W. Knickel
                                        Title:  Vice President
<PAGE>   44
                                    SIGNATURE

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

July 25, 2000                           HM 4-EQ (1999) COINVESTORS, L.P.

                                          By: Hicks, Muse GP (1999) Partners
                                             IV, L.P., its General Partner

                                          By: Hicks, Muse (1999) Fund IV, LLC,
                                             its General Partner

                                        By: /s/ David W. Knickel
                                           ----------------------------
                                        Name: David W. Knickel
                                        Title: Vice President
<PAGE>   45
                                    SIGNATURE

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

July 25, 2000                           HM 4-SBS ICG COINVESTORS, LLC

                                        By: /s/ David W. Knickel
                                          ----------------------------
                                        Name: David W. Knickel
                                        Title: Vice President
<PAGE>   46
                                    SIGNATURE

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

July 25, 2000                           HM 4-SBS (1999) COINVESTORS, L.P.


                                          By: Hicks, Muse GP (1999) Partners
                                             IV, L.P., its General Partner

                                          By: Hicks, Muse (1999) Fund IV, LLC,
                                             its General Partner

                                        By: /s/ David W. Knickel
                                           ----------------------------
                                        Name: David W. Knickel
                                        Title: Vice President



<PAGE>   47
                                    SIGNATURE

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

July 25, 2000                           HICKS, MUSE GP (1999) PARTNERS IV, L.P.


                                        By: Hicks, Muse (1999)
                                            Fund IV, LLC., its General Partner

                                        By: /s/ David W. Knickel
                                          ----------------------------
                                        Name:  David W. Knickel
                                        Title: Vice President
<PAGE>   48
                                    SIGNATURE

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

July 25, 2000                           HICKS, MUSE (1999) FUND IV, LLC


                                        By: /s/ David W. Knickel
                                          ----------------------------
                                        Name: David W. Knickel
                                        Title: Vice President

<PAGE>   49
                                    SIGNATURE

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

July 25, 2000                       HM PG4-IV ICG, LLC


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President


<PAGE>   50
                                    SIGNATURE

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

July 25, 2000                       HICKS, MUSE PG-IV (1999), C.V.


                                    By: HM Equity Fund IV/GP Partners (1999),
                                        C.V., its General Partner

                                    By: HM GP Partners IV Cayman, L.P.,
                                        its General Partner


                                    By: HM Fund IV Cayman LLC,
                                        its General Partner


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President


<PAGE>   51
                                    SIGNATURE

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

July 25, 2000                       HM EQUITY FUND IV/GP PARTNERS (1999), C.V.

                                    By: HM GP Partners IV Cayman, L.P., its
                                        General Partner

                                    By: HM IV Cayman LLC, its General Partner

                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President
<PAGE>   52
                                    SIGNATURE

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

July 25, 2000                       HM GP PARTNERS IV CAYMAN, L.P.


                                    By: HM Fund IV Cayman LLC,
                                        its General Partner


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President


<PAGE>   53
                                    SIGNATURE

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

July 25, 2000                       HM FUND IV CAYMAN LLC


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President
<PAGE>   54
                                    SIGNATURE

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

July 25, 2000                       HMTF BRIDGE ICG, LLC

                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President

<PAGE>   55
                                    SIGNATURE

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

July 25, 2000                       HMTF BRIDGE PARTNERS, L.P.


                                    By: HMTF Bridge Partners, LLC,
                                        its General Partner


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President


<PAGE>   56
                                    SIGNATURE

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

July 25, 2000                       HMTF BRIDGE PARTNERS, LLC


                                    By: /s/ David W. Knickel
                                       ----------------------------
                                    Name: David W. Knickel
                                    Title: Vice President
<PAGE>   57
                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
NUMBER            DESCRIPTION
-------           -----------
<S>               <C>
 10.7             Demand Notes issued by Bridge LLC to Qualified LLC,
                  Private LLC, 4-EQ LLC, 4-SBS LLC and PG-IV LLC.
</TABLE>


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