NORSTAN INC
SC 13G/A, 1999-05-10
TELEPHONE INTERCONNECT SYSTEMS
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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. 6)*


                                 NORSTAN, INC.
                               (Name of Issuer)


                                 COMMON STOCK
                        (Title of Class of Securities)


                                   656535101
                                (CUSIP Number)

                                April 30, 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)
     [_]  Rule 13d-(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 1 of 5 pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO. 656535101               13G                    PAGE 2 OF 5 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                                                                                
               HEARTLAND ADVISORS, INC.

               #39-1078128
                          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

               WISCONSIN, USA
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF             1,260,600
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                     None 
     OWNED BY            
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING              1,853,400
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                     None
 
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
          1,853,400

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
          17.3%                                                          

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           
      
               1A

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
Item 1(a)      Name of Issuer: Norstan, Inc.


Item 1(b)      Address of Issuer's Principal Executive Offices:
                    5101 Shady Oak Road
                    Minnetonka, MN 55343-4100
             

Item 2(a)      Name of Person Filing: Heartland Advisors, Inc.

             
Item 2(b)      Address of Principal Business Office:
                         Heartland Advisors, Inc.
                         790 North Milwaukee Street
                         Milwaukee, WI 53202

             
Item 2(c)      Citizenship: Heartland Advisors is a Wisconsin corporation.

             
Item 2(d)      Title of Class of Securities: Common Stock

             
Item 2(e)      CUSIP Number: 656535101

             
Item 3.        This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b)
               and the person filing is an investment adviser registered under
               section 203 of the Investment Advisers Act of 1940.

  (a)____           Broker or Dealer registered under Section 15 of the Act (15
                    U.S.C. 78o).

  (b)____           Bank as defined in Section 3(a)(6) of the Act (15 U.S.C.
                    78c).

  (c)____           Insurance company as defined in Section 3(a)(19) of the Act
                    (15 U.S.C. 78c).

  (d)____           Investment company registered under section 8 of the
                    Investment Company Act of 1940 (15 U.S.C. 80a-8).

  (e)  X            An investment adviser in accordance with (S)240,13d-
      ---           1(b)(1)(ii)(E).

  (f)____           An employee benefit plan or endowment fund in accordance
                    with (S)240.13d-1(b)(1)(ii)(F).
<PAGE>
 
  (g)____           A parent holding company or control person in accordance
                    with (S)240.13d-1(b)(11)(G);

  (h)____           A savings association as defined in Section 3(b) of the
                    Federal Deposit Insurance Act (12 U.S.C. 1813;

  (i)____           A church plan that is excluded from the definition of an
                    investment company under section 3(c)(14) of the Investment
                    Company Act of 1940 (15 U.S.C. 80a-3);

  (j)____           Group, in accordance with (S)240.13d-1(b)(1)(ii)(J).

If this statement is filed pursuant to (S)240.13d-1(c), check this box [_].

Item 4.        Ownership.

               (a) Amount Beneficially Owned:  

                   1,853,400 shares may be deemed beneficially owned within the 
meaning of Rule 13d-3 of the Securities Exchange Act of 1934 by Heartland 
Advisors, Inc.

               (b)  Percent of Class:  
                    17.3%

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

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

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

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

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

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.

               The shares of common stock to which this Schedule relates are
               held in investment advisory accounts of Heartland Advisors, Inc.
               As a result, various persons have the right to receive or the
               power to direct the receipt of dividends from, or the proceeds
               from the sale of, the securities. No such account is known to
               have such an interest relating to more than 5% of the class.

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.
<PAGE>
 
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 and are held in the
ordinary course of business and were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.

                                   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:  May 5, 1999

                         HEARTLAND ADVISORS, INC.

                         By:  PATRICK J. RETZER
                               Patrick J. Retzer
                               Senior Vice President


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