<PAGE>   2

                           TRANSWESTERN HOLDINGS L.P.
                                 FORM 10-Q/A INDEX

<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>      <C>                                                             <C>
PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements

Consolidated Balance Sheets 
   as of September 30, 1998 (unaudited) and April 30, 1998                   3

Consolidated Statements of Income 
   for the Nine Months Ended September 30, 1998 (unaudited) 
   and 1997 (unaudited) and the Two Months Ended June 30, 1998 (unaudited)   4

Consolidated Statements of Cash Flows for the Nine
   Months Ended September 30, 1998  (unaudited) and 1997 (unaudited)         5

Notes to Unaudited Consolidated Financial Statements                         6
</TABLE>



<PAGE>   3
PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements

                           TransWestern Holdings L.P.
                           Consolidated Balance Sheets
                                 (in thousands)

<TABLE>
<CAPTION>
                                                         SEPTEMBER 30,   APRIL 30,
                                                             1998           1998
                                                           ---------     ---------
                                                          (UNAUDITED)
<S>                                                        <C>           <C>      
ASSETS
Current assets:
  Cash                                                     $   2,102     $   1,512
  Trade receivable, (less allowance for doubtful
    accounts of $9,155 in September 1998 and $9,532 in        21,458        26,127
    April 1998)
  Deferred directory costs                                     7,292         6,226
  Other current assets                                           770           950
                                                           ---------     ---------
Total current assets                                          31,622        34,815
Property, equipment and leasehold improvements, net            2,712         2,694
Acquired intangibles, net                                     18,772        14,326
Other assets, primarily debt issuance costs, net               9,748        10,162
                                                           ---------     ---------
Total assets                                               $  62,854     $  61,997
                                                           =========     =========

LIABILITIES AND PARTNERSHIP EQUITY 
Current liabilities:
  Accounts payable                                         $   4,030     $   4,373
  Salaries and benefits payable                                3,424         3,075
  Accrued acquisition costs                                      316           504
  Accrued Equity Compensation Plan contribution                3,004         2,900
  Accrued interest                                             3,996         4,841
  Other accrued liabilities                                      781         1,129
  Customer deposits                                           13,370        10,164
  Current portion, long-term debt                              2,391         2,391
                                                           ---------     ---------
Total current liabilities                                     31,312       433,350
Long-term debt:
  Revolving loan                                               1,500            --
  Senior Credit Facility                                      76,813        77,344
  Series B 9 5/8% Senior Subordinated Notes                  100,000       100,000
  Series B 11 7/8% Senior Subordinated Notes, net             35,998        34,303
Partnership deficit:
  General partner                                             (3,107)       (3,043)
  Limited partner                                           (179,662)     (175,984)
                                                           ---------     ---------
Total partnership equity                                    (182,769)     (179,027)
                                                           ---------     ---------
Total liabilities and partnership deficit                  $  62,854     $  61,997
                                                           =========     =========
</TABLE>

See accompanying notes.



<PAGE>   4

                           TransWestern Holdings L.P.

                        Consolidated Statements of Income

                                   (Unaudited)

                  (in thousands, except per partner unit data)


<TABLE>
<CAPTION>
                                                                                   TWO MONTHS
                                  THREE MONTHS ENDED         NINE MONTHS ENDED        ENDED
                                     SEPTEMBER 30,             SEPTEMBER 30,         JUNE 30,
                                ---------------------     ---------------------     --------
                                  1998         1997         1998         1997         1998
                                --------     --------     --------     --------     --------
<S>                             <C>          <C>          <C>          <C>          <C>
Net revenue                     $ 28,995     $ 25,539     $ 84,545     $ 73,292     $  7,732
Cost of revenues                   5,557        5,606       15,927       15,410        2,134
                                --------     --------     --------     --------     --------
Gross profit                      23,438       19,933       68,618       57,882        5,598

Operating expenses:
  Sales and marketing             12,188       10,442       34,127       30,037        4,501
  General and administrative       4,358        3,893       12,862       12,272        2,506
                                --------     --------     --------     --------     --------
Total operating expenses          16,546       14,335       46,989       42,309        7,007
                                --------     --------     --------     --------     --------
Income (loss) from operations      6,892        5,598       21,629       15,573       (1,409)
Other income, net                     75          104          244          300           64
Interest expense                  (5,622)      (1,479)     (16,695)      (5,197)      (3,704)
                                --------     --------     --------     --------     --------
Net income (loss)               $  1,345     $  4,223     $  5,178     $ 10,676     $ (5,049)
                                ========     ========     ========     ========     ========
Net income (loss) 
     per Partnership unit       $  1,345     $  4,223     $  5,178     $ 10,676     $ (5,049)
                                ========     ========     ========     ========     ========
Net income (loss) allocated 
     to General partner units   $     23     $     43     $     88     $    109     $    (86)
                                ========     ========     ========     ========     ========
Net income (loss) allocated 
     to Limited Partner units   $  1,322     $  4,180     $  5,090     $ 10,567     $ (4,963)
                                ========     ========     ========     ========     ========
Net income (loss) per 
     General Partner unit       $   2.33     $   4.39     $   8.98     $  11.10     $  (8.76)
                                ========     ========     ========     ========     ========
Net income (loss) per 
     Limited Partner unit       $   0.52     $   1.05     $   2.00     $   2.66     $  (1.95)
                                ========     ========     ========     ========     ========
</TABLE>



See accompanying notes.



<PAGE>   5

                           TransWestern Holdings L.P.

                      Consolidated Statements of Cash Flows

                                   (Unaudited)

                                 (in thousands)

<TABLE>
<CAPTION>
                                                                NINE MONTHS ENDED
                                                                   SEPTEMBER 30,
                                                                1998         1997
                                                              --------     --------
<S>                                                           <C>          <C>     
OPERATING ACTIVITIES
Net income                                                    $  5,178     $ 10,676
Adjustments  to reconcile net income to net cash provided
   by operating activities:
   Depreciation and amortization                                 8,068        4,932
   Amortization of deferred debt issuance costs                    950          505
   Provision for doubtful accounts                               8,018        7,195
   Changes in operating assets and liabilities, net of
      effects of purchased directories:
      Trade receivables                                         (5,625)      (2,406)
      Write-off of doubtful accounts                            (7,251)      (5,547)
      Recoveries of doubtful accounts                              402          451
      Deferred directory costs                                   1,533          929
      Other current assets                                        (214)         193
      Accounts payable                                             739         (149)
      Accrued liabilities                                        1,486       (3,823)
      Accrued interest                                           1,740            9
      Customer deposits                                         (1,725)        (501)
                                                              --------     --------
Net cash provided by operating activities                       13,299       12,454

INVESTING ACTIVITIES
Purchase of property, equipment and leasehold improvements        (702)      (1,133)
Payment for purchase of directories                            (15,468)          --
                                                              --------     --------
Net cash used for investing activities                         (16,170)      (1,133)

FINANCING ACTIVITIES
Borrowings under long-term debt agreements:
   Revolving credit facility                                    24,866       14,500
Repayments of long-term debt
   Revolving credit facility                                   (23,175)     (16,200)
   Other long-term debt                                           (430)        (505)
   Senior Term Loan                                             (3,062)      (6,500)
Distributions to member                                            (38)      (3,700)
                                                              --------     --------
Net cash used for financing activities                          (1,839)     (12,405)
                                                              --------     --------

Net (decrease) increase in cash                                 (4,710)      (1,084)
Cash at beginning of period                                      6,812
                                                              --------     --------
Cash at end of period                                         $  2,102     $  1,969
                                                              ========     ========

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest                                        $ 11,029     $  3,977
</TABLE>

See accompanying notes.


<PAGE>   6

                           TRANSWESTERN HOLDINGS L.P.

              NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS
                      (ALL DOLLAR AMOUNTS ARE IN THOUSANDS)

1.   BASIS OF PRESENTATION, ORGANIZATION AND BUSINESS ACTIVITIES

     The accompanying unaudited condensed consolidated financial statements have
been prepared in accordance with generally accepted accounting principles for
interim financial information and the instructions to Form 10-Q and Article 10
of Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements. In the opinion of management, all adjustments (consisting
of normal recurring accruals) considered necessary for a fair presentation have
been included. Operating results for the three and nine-month periods ended
September 30, 1998 are not necessarily indicative of the results that may be
expected for the year ending December 31, 1998. For further information, refer
to the consolidated financial statements and footnotes thereto included in
Holdings' Form 10-K (SEC File No. 333-42117), for the fiscal year ended April
30, 1998.

     In November 1997, TransWestern Publishing Company L.P. (the "Partnership")
changed its name to TransWestern Holdings L.P. ("Holdings") and formed and
contributed substantially all of its assets to TransWestern Publishing Company
LLC ("TransWestern" or the "Company"). TransWestern assumed or guaranteed all of
the liabilities of the Partnership. As a result, Holdings' only assets consist
of TransWestern's Member Units (as defined) and all of Capital's (as defined)
capital stock. All of the operations that were previously conducted by the
Partnership are now being conducted by TransWestern. Holdings has formed TWP
Capital Corp. ("Capital") as a wholly-owned subsidiary and TransWestern has
formed TWP Capital Corp. II ("Capital II") as a wholly-owned subsidiary. Neither
Capital nor Capital II has any significant assets or operations. In October
1997, the Partnership completed a $312 million recapitalization transaction (the
"Recapitalization").

    The membership interests of TransWestern consist of a single class of
authorized common units (the "Member Units"). Holdings is the sole member of
TransWestern and accordingly, holds all 1,000 of the issued and outstanding
Member Units.

    The general partner of Holding's is TransWestern Communications Company,
Inc. ("TCC"), which held approximately 1.0% of Holdings outstanding partnership
units in the period from formation of the Partnership (1993) through September
1997. Upon the consummation of the Recapitalization (as defined) in October
1997, TCC held approximately 1.7% of Holding's outstanding partnership units.

    The accompanying consolidated financial statements give retroactive effect
to the formation of the Company and the contribution of assets and liabilities
by Holdings as if these events had occurred on the date of the Partnership's
formation. The accompanying financial statements present the historical
financial position and results of operations of TransWestern.

    TransWestern publishes and distributes local yellow page directories in
thirteen states.

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    Revenue Recognition, Deferred Directory Costs and Customer Deposits

    Revenues from the sale of advertising placed in each directory are
recognized upon the distribution of directories in their individual market
areas. Advance payments received for directory advertising are shown as customer
deposits in the accompanying balance sheets. Expenditures directly related to
sales, production, printing and distribution of directories are capitalized as
deferred directory costs and matched against related revenues upon directory
distribution.


<PAGE>   7

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

     Concentration of Credit Risk

     Credit is extended based upon customer collection history and generally a
deposit is required. The Company is not subject to a concentration of credit
risk due to the geographic and economic diversity of its customer base, however
credit losses have represented a cost of doing business due to the nature of the
customer base (predominantly small businesses) and the use of extended credit
terms.

     A provision for doubtful accounts based on historical experience is
recorded at the time revenue is recognized for individual directories. Actual
write-offs are taken against the allowance when management determines that an
account is uncollectible. In general, management makes this determination when
an account has declared bankruptcy, has gone out of business or fails to renew
advertising for the following year's directory.

3.   FINANCIAL STATEMENT DETAILS

<TABLE>
<CAPTION>
                                                           SEPTEMBER 30,    APRIL 30,
                                                               1998            1998
                                                              -------        -------
                                                            (UNAUDITED)
<S>                                                           <C>            <C>    
         Computer and office equipment .....................  $ 5,649        $ 5,148
         Furniture and fixtures ............................    1,602          1,508
         Leasehold improvements ............................      291            278
                                                              -------        -------
                                                                7,542          6,934
         Less accumulated depreciation and amortization ....   (4,830)        (4,240)
                                                              -------        -------
                                                              $ 2,712        $ 2,694
                                                              =======        =======
</TABLE>

Acquired Intangibles (in thousands)

<TABLE>
<CAPTION>
                                                            SEPTEMBER 30,     APRIL 30,
                                                                1998            1998
                                                              --------        --------
                                                            (UNAUDITED)
<S>                                                           <C>             <C>     
         Customer Base .....................................  $ 42,176        $ 35,791
         Less accumulated amortization .....................   (23,404)        (21,465)
                                                              --------        --------
                                                              $ 18,772        $ 14,326
                                                              ========        ========
</TABLE>



<PAGE>   8

Other Assets (in thousands)

<TABLE>
<CAPTION>
                                                           SEPTEMBER 30,      APRIL 30,
                                                               1998             1998
                                                             ---------        --------
                                                            (UNAUDITED)
<S>                                                           <C>             <C>     
         Debt issuance costs ...............................  $ 10,373        $ 10,304
         Other .............................................       829             729
                                                              --------        --------
                                                                11,202           9,783
         Less accumulated amortization .....................    (1,454)           (814)
                                                              --------        --------
                                                              $  9,748        $  8,969
                                                              ========        ========
</TABLE>                                             

4.  DIRECTORY ACQUISITION

    On July 16, 1998, the Company purchased all of the outstanding common stock
of Target Directories of Michigan ("Target") for cash of approximately $5.4
million. In connection with the acquisition, the Company also assumed certain
liabilities of Target totaling approximately $1.6 million. The acquisition has
been accounted for as a purchase and accordingly the purchase price has been
allocated to the tangible and intangible assets acquired based on their
respective fair values at the date of acquisition, as follows (in thousands):

<TABLE>
<S>                                                   <C>
          Customer List                               $6,300
          Deferred directory costs                     1,009
          Other current and non-current assets           691
</TABLE>

4.  DIRECTORY ACQUISITION (CONTINUED)

    Assuming that the acquisition of Target had occurred on the first day of the
Company's nine month period ended September 30, 1998 and fiscal year ended April
30, 1997, respectively, the unaudited pro forma results of operations would be
as follows:

<TABLE>
<CAPTION>
                                             September 30,    April 30,
                                                 1998             1998
                                                     (Unaudited)

<S>                                             <C>             
         Net revenues ........................  $85,333        $102,240
         Net income (loss)....................    3,433          (3,665)
</TABLE>

    The above pro forma results give effect to pro forma adjustments for the
amortization of acquired intangibles.



<PAGE>   9

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrants have duly caused this report to be signed on November 14, 1998 on
their behalf by the undersigned thereunto duly authorized.

                                      TRANSWESTERN HOLDINGS L.P.
                                ------------------------------------------
                                              (Registrant)

                            BY:  TransWestern Communications Company, Inc.
                                ------------------------------------------
                                            (General Partner)


                            BY: 
                                ------------------------------------------
                                Name:  Joan M. Fiorito
                                Title:  Vice President, Chief Financial 
                                Officer and Assistant Secretary (Principal 
                                Financial and Accounting Officer)