AU BON PAIN CO INC
SC 13G/A, 1998-02-05
EATING PLACES
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934

                            (Amendment No.     2    )*
                                           ---------
 
                             Au Bon Pain Co. Inc.
- --------------------------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

 
                                   05010310
                            -----------------------
                                (CUSIP Number)


*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 1 of 8 pages
<PAGE>
 
- ---------------------                                        -------------------
 CUSIP No.  05010310                    13G                   Page 2 of 8 Pages
- ---------------------                                        -------------------

- --------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
          Wanger Asset Management, L.P. 36-3820584

- --------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_] 
 
- --------------------------------------------------------------------------------
      SEC USE ONLY
 3


- --------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
          Delaware

- --------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
                             None
     NUMBER OF
                   -------------------------------------------------------------
      SHARES              SHARED VOTING POWER
                     6
   BENEFICIALLY              634,000

     OWNED BY      -------------------------------------------------------------
                          SOLE DISPOSITIVE POWER
       EACH          7
                             None
     REPORTING  
                   -------------------------------------------------------------
      PERSON         8    SHARED DISPOSITIVE POWER   
                      
       WITH                  634,000

- --------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
          634,000

- --------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
 10 
          Not Applicable

- --------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED B AMOUNT IN ROW 9   
 11
          6.23%

- --------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
 12
          IA

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
- ---------------------                                        -------------------
 CUSIP No.  05010310                    13G                   Page 3 of 8 Pages
- ---------------------                                        -------------------

- --------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
          Wanger Asset Management, Ltd.


- --------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_] 
 
- --------------------------------------------------------------------------------
      SEC USE ONLY
 3


- --------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
          Delaware

- --------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
                             None
     NUMBER OF
                   -------------------------------------------------------------
      SHARES              SHARED VOTING POWER
                     6
   BENEFICIALLY              634,000

     OWNED BY      -------------------------------------------------------------
                          SOLE DISPOSITIVE POWER
       EACH          7
                             None
     REPORTING  
                   -------------------------------------------------------------
      PERSON         8    SHARED DISPOSITIVE POWER   
                      
       WITH                  634,000

- --------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
          634,000

- --------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
 10 
          Not Applicable

- --------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED B AMOUNT IN ROW 9   
 11
          6.23%

- --------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
 12
          CO

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
- ---------------------                                        -------------------
 CUSIP No.  05010310                    13G                   Page 4 of 8 Pages
- ---------------------                                        -------------------

- --------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
          Acorn Investment Trust


- --------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_] 
 
- --------------------------------------------------------------------------------
      SEC USE ONLY
 3


- --------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
          Massachusetts

- --------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
                             None
     NUMBER OF
                   -------------------------------------------------------------
      SHARES              SHARED VOTING POWER
                     6
   BENEFICIALLY              634,000

     OWNED BY      -------------------------------------------------------------
                          SOLE DISPOSITIVE POWER
       EACH          7
                             None
     REPORTING  
                   -------------------------------------------------------------
      PERSON         8    SHARED DISPOSITIVE POWER   
                      
       WITH                  634,000

- --------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
          634,000

- --------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
 10 
          Not Applicable

- --------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED B AMOUNT IN ROW 9   
 11
          6.23%

- --------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
 12
          IV

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)      Name of Issuer:

                    Au Bon Pain Co. Inc.


Item 1(b)      Address of Issuer's Principal Executive Offices:

                    19 Fid Kennedy Avenue
                    Boston, MA 02210


Item 2(a)      Name of Person Filing:

                    Wanger Asset Management, L.P. ("WAM");
                    Wanger Asset Management Ltd., the general partner of WAM 
                    ("WAM LTD.");
                    Acorn Investment Trust ("Acorn")


Item 2(b)      Address of Principal Business Office:

                    WAM, WAM LTD. and Acorn are all located at:
                    227 West Monroe Street, Suite 3000
                    Chicago, Illinois 60606


Item 2(c)      Citizenship:

                    WAM is a Delaware limited partnership.
                    WAM LTD. is a Delaware corporation.
                    Acorn is a Massachusetts business trust.


Item 2(d)      Title of Class of Securities:

                    Common Stock


Item 2(e)      CUSIP Number:

                    05010310


Item 3         Type of Person:

                    (d)  Acorn is an investment company registered under section
                         8 of the Investment Company Act of 1940.

                    (e)  WAM is an Investment Adviser registered under section
                         203 of the Investment Advisers Act of 1940; WAM LTD. is
                         the General Partner of the Investment Adviser; Wanger
                         is the principal stockholder of the General Partner.

                               Page 5 of 8 pages
<PAGE>
 
Item 4         Ownership (at December 31, 1997):
                                            --  

                    (a)  Amount owned "beneficially" within the meaning of
                         rule 13d-3:
                         
                         634,000 shares

                    (b)  Percent of class:

                         6.23% (based on 10,180,874 shares outstanding as of 
                         November 12, 1997)
     
                    (c)  Number of shares as to which such person has:

                              (i)    sole power to vote or to direct the vote:
                                     none
                              (ii)   shared power to vote or to direct the vote:
                                     634,000
                              (iii)  sole power to dispose or to direct the
                                     disposition of: none
                              (iv)   shared power to dispose or to direct
                                     disposition of: 634,000

Item 5         Ownership of Five Percent or Less of a Class:

                    Not Applicable


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

                    The shares reported herein have been acquired on behalf of
                    discretionary clients of WAM, including Acorn. Persons other
                    than WAM and WAM LTD are entitled to receive all dividends
                    from, and proceeds from the sale of, those shares. Acorn is
                    the only such person known to be entitled to receive all
                    dividends from, and proceeds from, the sale of those shares
                    reported herein to the extent of more than 5% of the class.

                               Page 6 of 8 pages
<PAGE>
 
Item 7         Identification and Classification of the Subsidiary Which
               Acquired the Security Being Reported on by the Parent Holding    
               Company:

                    Not Applicable


Item 8         Identification and Classification of Members of the Group:

                    Not Applicable


Item 9         Notice of Dissolution of Group:

                    Not Applicable


Item 10        Certification:

                    By signing below I certify that, to the best of my knowledge
               and belief, the securities referred to above were acquired in the
               ordinary course of business and were not acquired for the purpose
               of and do not have the effect of changing or influencing the
               control of the issuer of such securities and were not acquired in
               connection with or as a participant in any transaction having
               such purpose or effect.

                               Page 7 of 8 pages
 
<PAGE>
 
                                   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:  February 5, 1998

               The undersigned corporation, on the date above written, agrees
               and consents to the joint filing on its behalf of this Schedule
               13G in connection with its beneficial ownership of the security
               reported herein.


                                        WANGER ASSET MANAGEMENT, LTD.
                                          for itself and as general partner of
                                          WANGER ASSET MANAGEMENT, L.P.



                                        By:  /s/ Bruce H. Lauer
                                             ----------------------------------
                                                 Bruce H. Lauer
                                                 Vice President


               The undersigned, on the date above written, agrees and consents
               to the joint filing on its behalf of this Schedule 13G in
               connection with its beneficial ownership of the security reported
               herein.

                                        ACORN INVESTMENT TRUST



                                        By: /s/ Bruce H. Lauer
                                        ---------------------------------------
                                                Bruce H. Lauer
                                                Vice President and Treasurer
                               Page 8 of 8 pages


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