QUAKER CAPITAL MANAGEMENT CORP
SC 13G/A, 1999-07-07
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<PAGE>   1

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 SCHEDULE 13G/A


                   Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


                       Nucentrix Broadband Networks, Inc.
                       ----------------------------------
                                (Name of Issuer)


                         Common Stock, $.001 par value
                         ------------------------------
                         (Title of Class of Securities)


                                  670198 10 0
                                 --------------
                                 (CUSIP Number)


                                 June 24, 1999
                                 -------------
            (Date of Event Which Requires Filing of this Statement)



     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

     [ ] Rule 13d-1(b)

     [X] Rule 13d-1(c)

     [ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

<PAGE>   2

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10

1)       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Quaker Capital Management Corporation

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

3)       SEC USE ONLY
                     ----------------------------------------------------------

4)       CITIZENSHIP OR PLACE OF ORGANIZATION
          Pennsylvania

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5)       SOLE VOTING POWER
          897,637

6)       SHARED VOTING POWER
          94,876

7)       SOLE DISPOSITIVE POWER
          980,683

8)       SHARED DISPOSITIVE POWER
          480,026

9)       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          1,460,709

10)      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
          [ ]

11)      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          14.5%*

12)      TYPE OF REPORTING PERSON
          IA

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

* Based on 10,052,960 shares outstanding as of June 23, 1999


                               Page 2 of 10 Pages

<PAGE>   3

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10

1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         Quaker Capital Partners I, L.P.

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

3)      SEC USE ONLY
                    -----------------------------------------------------------

4)      CITIZENSHIP OR PLACE OF ORGANIZATION
         Pennsylvania

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5)      SOLE VOTING POWER
         897,637(1)

6)      SHARED VOTING POWER
         -0-

7)      SOLE DISPOSITIVE POWER
         897,637(1)

8)      SHARED DISPOSITIVE POWER
         -0-

9)      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         897,637

10)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         [ ]

11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         8.9%*

12)     TYPE OF REPORTING PERSON
         PN

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

(1) Power is exercised by Quaker Capital Management Corporation as the sole
general partner of Quaker Premier, L.P., which is the sole general partner of
Quaker Capital Partners I, L.P.

* Based on 10,052,960 shares outstanding as of June 23, 1999


                               Page 3 of 10 Pages

<PAGE>   4

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10

1)      NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         Quaker Premier, L.P.

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

3)      SEC USE ONLY
                    -----------------------------------------------------------

4)      CITIZENSHIP OR PLACE OF ORGANIZATION
         Pennsylvania

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5)      SOLE VOTING POWER
         897,637(1)

6)      SHARED VOTING POWER
         -0-

7)      SOLE DISPOSITIVE POWER
         897,637(1)

8)      SHARED DISPOSITIVE POWER
         -0-

9)      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         897,637

10)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         [ ]

11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         8.9%*

12)     TYPE OF REPORTING PERSON
         PN

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

(1) In its capacity as sole general partner of Quaker Capital Partners I, L.P.,
which directly owns the shares. Power is exercised by Quaker Capital Management
Corporation, which is the sole general partner of Quaker Premier, L.P.

* Based on 10,052,960 shares outstanding as of June 23, 1999


                               Page 4 of 10 Pages
<PAGE>   5

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10


        This Amendment No. 1 to Schedule 13G (the "Amendment") is being filed by
Quaker Capital Management Corporation ("QCMC"), Quaker Capital Partners I, L.P.
("QCPI"), and Quaker Premier, L.P. ("QP"), to amend the cover page for each of
QCMC, QCPI and QP and items 4 and 6 of the original Schedule 13G dated April
10, 1999 (the "Original Schedule 13G"), to reflect (i) QCMC's ceasing to act as
an investment advisor, effective as of June 24, 1999, with respect to one
client that held 65,599 shares of the class of securities to which the Original
Schedule 13G relates, and (ii) the inadvertent overstatement in the Original
Schedule 13G of shares beneficially owned by each of QCMC, QCPI and QP, which
overstatement was caused by a mathematical error, as well as to supplement the
information in Items 4 and 6 of the Original Schedule 13G regarding the
ownership of certain shares reported in the Original Schedule 13G. The
remaining portions of the Original Schedule 13G remain unchanged.

        The cover page for each of QCMC, QCPI and QP are amended to read as set
forth on page 2, 3 and 4, respectively, of this Amendment.

        Items 4 and 6 of the Original Schedule 13G are amended to read in their
entirety as set forth below.

Item 4. Ownership.

        Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

        (a)  Amount beneficially owned:

             In connection with the corporate restructuring of the issuer under
        Chapter 11 of the United States Bankruptcy Code (the "Restructuring"),
        which became effective as of April 1, 1999, all of the common stock of
        the issuer outstanding as of April 1, 1999, was canceled and newly
        issued shares of common stock of the issuer were distributed to the
        holders of the issuer's old senior notes and convertible notes. Each of
        the reporting persons directly or indirectly acquired its common stock
        in the Restructuring in exchange for the cancellation of the issuer's
        old senior notes held by such reporting person. Quaker Capital Partners
        I, L.P. is the direct beneficial owner of 897,637 shares of common
        stock of the issuer. Quaker Premier, L.P. is the sole general partner
        of Quaker Capital Partners I, L.P., and, as such, may be deemed to
        beneficially own the 897,637 shares of common stock held by Quaker
        Capital Partners I, L.P. Quaker Capital Management Corporation is the
        sole general partner of Quaker Premier, L.P., and, as such, may be
        deemed to beneficially own the 897,637 shares of common stock held by
        Quaker Capital Partners I, L.P. Quaker Capital Management Corporation
        also may be deemed to beneficially own (i) 480,026 shares of common
        stock which are held by a variety of Quaker Capital Management
        Corporation's investment advisory clients and (ii) 83,046 shares of
        common stock held by Ridgeview Partners (41,523 shares) and the Carol
        S. Schoeppner Trust FBO Mark G. Schoeppner (41,523 shares).

        (b)  Percent of class:

             See item 11 of pages 2-4 of this Schedule 13G.

        (c)  Number of shares as to which such person has:


                               Page 5 of 10 Pages

<PAGE>   6

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10

          (i)  sole power to vote or to direct the vote:

               See item 5 of pages 2-4 of this Schedule 13G.

          (ii) shared power to vote or to direct the vote:

               See item 6 of pages 2-4 of this Schedule 13G.

          (iii) sole power to dispose or to direct the disposition of:

               See item 7 of pages 2-4 of this Schedule 13G.

          (iv) shared power to dispose or to direct the disposition of:

               See item 8 of pages 2-4 of this Schedule 13G.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

        480,026 of the shares with respect to which this report is filed are
owned by a variety of investment advisory clients of the Reporting Persons,
which clients are entitled to receive dividends on or the proceeds from the
sale of such shares. No client is known to own more than 5% of the class.

        83,046 of the shares with respect which this report is filed are owned
by other persons as described in clause (ii) of item 4(a) of this Schedule 13G,
which direct owners are entitled to receive dividends from, or the proceeds
from the sale of, such shares. Neither of such direct holders is known to own
more than 5% of the class.


                               Page 6 of 10 Pages

<PAGE>   7

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10


                                   SIGNATURE

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

Date:    June 30, 1999

                                          QUAKER CAPITAL MANAGEMENT CORPORATION



                                          By: /s/ MARK G. SCHOEPPNER
                                              ----------------------------------
                                              Mark G. Schoeppner, President





                               Page 7 of 10 Pages

<PAGE>   8

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10

                                   SIGNATURE

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

Date:    June 30, 1999

                                     QUAKER CAPITAL PARTNERS I, L.P.

                                     By: Quaker Premier, L.P., its general
                                         partner

                                     By: Quaker Capital Management
                                         Corporation, its general partner



                                         By: /s/ MARK G. SCHOEPPNER
                                             -----------------------------------
                                             Mark G. Schoeppner,
                                             President





                               Page 8 of 10 Pages

<PAGE>   9

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10


                                   SIGNATURE

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

Date:    June 30, 1999

                                           QUAKER PREMIER, L.P.

                                           By: Quaker Capital Management
                                               Corporation, its general partner



                                               By: /s/ MARK G. SCHOEPPNER
                                                  -----------------------------
                                                  Mark G. Schoeppner,
                                                  President






                               Page 9 of 10 Pages

<PAGE>   10

                                  SCHEDULE 13G
                              CUSIP NO. 670198 10


                             JOINT FILING AGREEMENT


         Previously filed with the Schedule 13G dated April 10, 1999, filed by
the Reporting Persons.






                              Page 10 of 10 Pages


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