CMAC INVESTMENT CORP
SC 13G, 1997-02-14
SURETY INSURANCE
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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.   )*


                         CMAC INVESTMENT CORPORATION
                              (Name of Issuer)


                                COMMON STOCK
                       (Title of Class of Securities)


                                  125662106
                               (CUSIP Number)


Check the following box if a fee is being paid with this statement [    ].  (A
fee is not required only if the filing person:  (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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 purposed 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

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CUSIP NO.  125662106                  13G                 Page  2  of  7  Pages

1.   NAME OF REPORTING PERSON
     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                 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              601,500   
             OWNED BY  
               EACH            6.  SHARED VOTING POWER
            REPORTING          None                                
              PERSON 
               WITH            7.  SOLE DISPOSITIVE POWER
                  
                                     602,500  
                  
                               8.  SHARED DISPOSITIVE POWER
                               None                              
                        
               

9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                 
         602,500                                                 


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



11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          5.4%    


12.  TYPE OF REPORTING PERSON*
          
              IA


<PAGE>   3


CUSIP NUMBER  125662106                                      Page 3 Of 5 Pages

Item 1.
     (a) Name of Issuer:   CMAC Investment Corporation


     (b) Address of Issuer's Principal Executive Offices:
           1601 Market Street, 12th Floor
           Philadelphia,  PA   19103     

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: 125662106

Item 3. If this statement is filed pursuant to Rule 13d-1(b),
        or 13d-2(b), check whether the person filing is a:

     (a)_____    Broker or Dealer registered under Section 15 of the Act.

     (b)_____    Bank as defined in Section 3(a)(6) of the Act.

     (c)_____    Insurance company as defined in Section 3(a)(19) of the 
                 Act.

     (d)_____    Investment company registered under Section 8 of
                 the Investment Company Act of 1940.

     (e)__X__    Investment adviser registered under Section 203 of
                 the Investment Advisers Act of 1940.

     (f)_____    Employee Benefit Plan, Pension Fund which is subject to 
                 the provisions of the Employee Retirement Income Security 
                 Act of 1974 or Endowment Fund;  see
                 Sec 240.13d-1(b)(1)(ii)(F).


<PAGE>   4



     (g)_____     Parent Holding Company, in accordance with
                  Sec 240.13d-1(b)(ii)(G) (Note:  See Item 1).


     (h)_____     Group, in accordance with
                  Sec 240.13d-1(b)(1)(ii)(H).

Item 4. Ownership.

     (a) Amount beneficially owned:
         602,500 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:
         5.4%

     (c) For information on voting and dispositive power with respect to the
above listed shares, see Items 5-8 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:[  ]


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.  The
interests of one such account, Heartland Value Fund, a series of Heartland
Group, Inc., a registered investment company,  relates 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.

Item 9. Notice of Dissolution of Group.

        Not Applicable.



<PAGE>   5


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 purposes 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:  February 12, 1997

                          HEARTLAND ADVISORS, INC.

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





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