ACORN INVESTMENT TRUST
SC 13G/A, 1998-02-06
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 2)*

                          STEVENS INTERNATIONAL, INC.
                               (Name of Issuer)

                    SERIES A COMMON STOCK, $0.10 PAR VALUE
                        (Title of Class of Securities)

                                   86024C20
                                (CUSIP Number)


*  The remainder of this cover page shall be filled out for a reporting person's
initial 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 5 Pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 86024C20                    13G                PAGE 2 OF 5 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON: 

      Acorn Investment Trust, Series Designated Acorn Fund 36-2692100

- ------------------------------------------------------------------------------
      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     
     NUMBER OF              None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                            457,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING               None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                            457,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9    
          457,000

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10      
          Not applicable
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
          6.18%

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

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

                     * SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)     Name of Issuer:  Stevens International, Inc.
                               (formerly Stevens Graphics Corporation)

Item 1(b)     Address of Issuer's Principal Executive Offices:
                   5500 Airport Freeway
                   Fort Worth, Texas 76117

Item 2(a)     Name of Person Filing:
                   Acorn Investment Trust, Series Designated Acorn Fund

Item 2(b)     Address of Principal Business Office:
                   227 West Monroe Street, Suite 3000
                   Chicago, Illinois 60606

Item 2(c)     Citizenship:
                   The filing person is a Massachusetts business trust.

Item 2(d)     Title of Class of Securities:
                   Series A Common Stock, $.10 Par Value

Item 2(e)     CUSIP Number:  86024C20

Item 3        Type of Person:
                   (d)  Investment company registered under section 8
                        of the Investment Company Act

Item 4        Ownership (at December 31, 1997):

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

                        457,000 shares

                   (b)  Percent of class:  6.18% (based on 7,390,899 Class A
                        shares outstanding)

                   (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:
                                457,000
                        (iii)   sole power to dispose or to direct the
                                disposition of:  none
                        (iv)    shared power to dispose or to direct
                                disposition of:  457,000

Power over voting and disposition of the securities is shared with Wanger Asset 
Management, L.P. which is the investment advisor of Acorn Investment Trust, 
Series Designated Fund.

                               Page 3 of 5 Pages
<PAGE>
 
Item 5        Ownership of Five Percent or Less of a Class:
                   If this statement is being filed to report the fact that
                   as of the date hereof the reporting person has ceased to
                   be the beneficial owner of more than five percent of the
                   class of securities, check the following ( ).

Item 6        Ownership of More Than Five Percent on behalf of Another Person:
                   Not applicable

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 4 of 5 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 6, 1998                ACORN INVESTMENT TRUST,
                                          SERIES DESIGNATED ACORN FUND

                                        By: /S/ Bruce H. Lauer
                                           ------------------------------------
                                              Bruce H. Lauer
                                            Vice President and Treasurer

                               Page 5 of 5 Pages


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