POLYMEDICA CORP
SC 13G/A, 1998-08-10
PHARMACEUTICAL PREPARATIONS
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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. 4)*

                             POLYMEDICA CORPORATION
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                   731738100
                                 (CUSIP Number)

                                 July 31, 1998
            (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. 731738100                  13G                    Page  2  of  5 Pages

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS

                HEARTLAND ADVISORS, INC.
 
                #39-1078128

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                        (a)  [ ]
                                                                        (b)  [ ]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                WISCONSIN, U.S.A.

      NUMBER OF             5.  SOLE VOTING POWER
SHARES BENEFICIALLY 
      OWNED BY                  110,800
        EACH
     REPORTING              6.  SHARED VOTING POWER
      PERSON                None
       WITH 
                            7.  SOLE DISPOSITIVE POWER
 
                                115,800
 
                            8.  SHARED DISPOSITIVE POWER
                            None

9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       115,800

10. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       1.3%

12. TYPE OF REPORTING PERSON

             IA
 
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CUSIP NUMBER 731738100                                         Page 3 Of 5 Pages

Item 1.

    (a) Name of Issuer: PolyMedica Corporation
        --------------                          

    (b) Address of Issuer's Principal Executive Offices:
        ----------------------------------------------- 
 
         11 State Street
         Woburn,  MA   01801

Item 2.

    (a) Name of Person Filing: Heartland Advisors, Inc.
        ---------------------                             
 
    (b) Address of Principal Business Office:
        ------------------------------------ 

               Heartland Advisors, Inc.
               790 North Milwaukee Street
               Milwaukee, WI 53202
 
    (c) Citizenship: Heartland Advisors is a Wisconsin corporation.
        -----------                                                      
 
    (d) Title of Class of Securities:  Common Stock
        ----------------------------               

    (e)  CUSIP Number: 731738100
         ------------           

Item 3. If this statement is filed pursuant to (S)(S) 240.13d-1(b) or 
        -------------------------------------------------------------
        240.13d-2(b) or (c), check whether the person filing is a:
        ---------------------------------------------------------

    (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)(ii)(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.
        --------- 

        For information on ownership, voting and dispositive power with respect
to the above listed shares, see Items 5-9 of the Cover 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: [X]


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 9. Notice of Dissolution of Group.
        ------------------------------ 

        Not Applicable.
<PAGE>
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:  August 6, 1998

                  HEARTLAND ADVISORS, INC.

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


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