AMERICAN INTERNATIONAL GROUP INC
SC 13D/A, 1999-05-03
FIRE, MARINE & CASUALTY INSURANCE
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<PAGE>   1



                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                (Amendment No. 20)
                             20th Century Industries

                                (Name of Issuer)

                        Common Stock, Without Par Value

                         (Title of Class of Securities)

                                   901272 20 3

                                 (CUSIP Number)

                              Kathleen E. Shannon
                          Vice President and Secretary
                       American International Group, Inc.
               70 Pine Street, New York, NY 10270 (212) 770-7000



            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)
                                 April 30, 1999
             (Date of Event which Requires Filing of this Statement)           

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box: [ ].

NOTE:  Six copies of this statement, including all exhibits, should be
filed with the Commission.  See Rule 13d-1(a) for other parties to whom
copies are to be sent.








<PAGE>   2
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

American International Group, Inc.
(I.R.S. Identification No. 13-2592361)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            WC, OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Delaware

NUMBER OF               (7)  SOLE VOTING POWER
SHARES                          
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                     53,013,920                        
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                             53,013,920                        

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                            53,013,920

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      60.5%
                
(14)  TYPE OF REPORTING PERSON

      HC, CO


                                 -2-
<PAGE>   3
CUSIP NO. 901272 20 3



 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

American Home Assurance Company
(I.R.S. Identification No. 13-5124990)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of New York


NUMBER OF               (7)  SOLE VOTING POWER
SHARES                         
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                       14,395,665           
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                               14,395,665          

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                              14,395,665

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          16.4     

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -3-
<PAGE>   4
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

Commerce & Industry Insurance Company
(I.R.S. Identification No. 31-1938623)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of New York


NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                        5,414,827
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                                5,414,827

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                5,414,827

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      6.2%

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -4-



<PAGE>   5
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

New Hampshire Insurance Company
(I.R.S. Identification No. 02-0172170)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Pennsylvania


NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                        5,414,827
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                                5,414,827

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                5,414,827

(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      6.2%

(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -5-
<PAGE>   6
CUSIP NO. 901272 20 3


 (1)  NAME OF REPORTING PERSON/S.S. OR I.R.S.
      IDENTIFICATION NO. OF ABOVE PERSON

National Union Fire Insurance Company of Pittsburgh, Pa.
(I.R.S. Identification No. 25-0687550)

 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                              (a)  / /
                              (b)  / /

 (3)  SEC USE ONLY


 (4)  SOURCES OF FUNDS

            WC, OO

 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) OR 2(e)
                                   / /

 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION

      Incorporated in the State of Pennsylvania


NUMBER OF               (7)  SOLE VOTING POWER
SHARES
BENEFICIALLY            (8)  SHARED VOTING POWER
OWNED BY                     27,788,601
EACH                    (9)  SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH            (10)  SHARED DISPOSITIVE POWER
                             27,788,601

(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                             27,788,601
 
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES
                                   / /

(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      31.7%
(14)  TYPE OF REPORTING PERSON

      IC, CO


                                 -6-
<PAGE>   7
ITEM 1.  SECURITY AND ISSUER.

            This Amendment No. 20 amends and supplements Item 5 of the Statement
on Schedule 13D dated December 16, 1994, as amended and supplemented by
Amendment No. 1 to Schedule 13D dated March 23, 1995, Amendment No. 2 to
Schedule 13D dated January 20, 1998, Amendment No. 3 to Schedule 13D dated April
9, 1998, Amendment No. 4 to Schedule 13D dated May 12, 1998, Amendment No. 5 to
Schedule 13D dated June 4, 1998, Amendment No. 6 to Schedule 13D dated June 15,
1998, Amendment No. 7 to Schedule 13D dated June 25, 1998, Amendment No. 8 to
Schedule 13D dated July 14, 1998, Amendment No. 9 to Schedule 13D dated July 23,
1998, Amendment No. 10 to Schedule 13D dated July 27, 1998, Amendment No. 11 to
Schedule 13D dated August 10, 1998, Amendment No. 12 to Schedule 13D dated
August 19, 1998, Amendment No. 13 to Schedule 13D dated August 24, 1998,
Amendment No. 14 to Schedule 13D dated September 3, 1998, Amendment No. 15 to
Schedule 13D dated September 11, 1998, Amendment No. 16 to Schedule 13D filed on
November 10, 1998, Amendment No. 17 to Schedule 13D filed on December 16, 1998,
Amendment No. 18 to Schedule 13D filed on February 5, 1999 and Amendment No. 19
to Schedule 13D filed on April 1, 1999 ("Schedule 13D") previously filed by 
American International Group, Inc., a Delaware corporation ("AIG"), relating 
to the common stock, without par value ("Common Stock"), of 20th Century 
Industries, a California corporation (the "Company"). The principal executive 
offices of the Company are located at Suite 700, 6301 Owensmouth Avenue, 
Woodland Hills, California 91367.

            Each capitalized term used in this statement which is defined in the
Schedule 13D shall have the meaning ascribed thereto in the Schedule 13D.
            
ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

            (a) Between April 1, 1999 and April 30, 1999 AIG, through its
subsidiary National Union, purchased 928,900 shares of Common Stock in open
market transactions effected on the New York Stock Exchange at prices ranging
from $16.0625 to $18.0000 per share as follows:



<TABLE>
<CAPTION>



        DATE                       SHARES          PRICE
        ----                       ------          -----
<S>                              <C>             <C>
April 1, 1999                        4,000         16.8125
        "                            2,100         16.8750
        "                            2,900         16.9375
        "                            2,500         17.0000
April 5, 1999                       10,300         16.6250
        "                           17,800         16.6875
        "                            3,700         16.7500
April 6, 1999                      221,000         16.5000
        "                            5,900         16.3125
        "                            1,000         16.2500
April 7, 1999                        3,400         16.0625
        "                          218,100         16.1250
        "                              500         16.2500
        "                              700         16.3125
        "                            1,500         16.3750
        "                            1,000         16.4375
        "                            3,200         16.5000
April 8, 1999                       11,600         16.4375
        "                            6,100         16.5000
April 9, 1999                       50,000         16.7500
        "                           10,900         16.6250
April 12, 1999                      96,600         16.7500
        "                            3,500         16.6875
        "                            1,900         16.8125
        "                           11,900         16.6250
April 13, 1999                      37,900         16.7500
        "                            1,600         16.6250
        "                              200         16.5625
April 14, 1999                      69,300         16.8125
        "                              500         16.6875
        "                            1,600         16.8750
April 15, 1999                       5,100         16.9375
        "                              100         16.8125
April 16, 1999                       5,800         16.9375
        "                              600         16.8750
April 23, 1999                         500         16.9375
April 26, 1999                         600         17.6875
        "                            8,300         17.7500
        "                           16,100         17.8125
        "                            5,700         17.8750
        "                            4,400         17.9375
        "                            4,300         18.0000
April 28, 1999                       2,100         17.8750
        "                            5,900         17.9375
April 29, 1999                       1,300         17.8750
        "                            5,000         17.9375
April 30, 1999                      10,400         17.8750
        "                           49,500         17.9375
</TABLE>





            National Union's and each other AIG Sub's current ownership
interests in the Company and the Common Stock is set forth on the cover pages to
this Amendment No. 20 to Schedule 13D. The ownership percentages appearing on
such pages have been calculated based on the number of shares of Common Stock
outstanding as of April 7, 1999 (87,635,364 shares) as reported by the Company
in the Company's Proxy Statement on Schedule 14A dated April 20, 1999.
        

                                      -7-
<PAGE>   8

      (b). AIG and each AIG Sub share voting and dispositive power as to the
securities owned by such AIG Sub.

      (c). AIG, American Home, Commerce & Industry, National Union, New
Hampshire, SICO, The Starr Foundation and Starr, and, to the best of each of
their knowledge, the Covered Persons, have not engaged in any transactions in
the Common Stock since the filing of Amendment No. 19 to Schedule 13D, except
for the purchase by  National Union between April 1, 1999 and April 30, 1999
of 928,900 shares of Common Stock as described in (a) above.

                                 -8-
<PAGE>   9
                               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.

Dated:  May 3, 1999

                                 AMERICAN INTERNATIONAL GROUP, INC.


                                 By:  /s/ Kathleen E. Shannon
                                 ---------------------------------------
                                 Kathleen E. Shannon, 
                                 Vice President and Secretary


                                 AMERICAN HOME ASSURANCE COMPANY


                                 By:  /s/ Edward E. Matthews
                                 ---------------------------------------
                                 Edward E. Matthews,
                                 Senior Vice President



                                 COMMERCE AND INDUSTRY INSURANCE COMPANY


                                 By:  /s/ Edward E. Matthews
                                 ---------------------------------------
                                 Edward E. Matthews,
                                 Senior Vice President



                                 NATIONAL UNION FIRE INSURANCE COMPANY
                                 OF PITTSBURGH, PA.


                                 By:  /s/ Edward E. Matthews
                                 ---------------------------------------
                                 Edward E. Matthews,
                                 Senior Vice President


                                 NEW HAMPSHIRE INSURANCE COMPANY



                                 By:  /s/ Edward E. Matthews
                                 ---------------------------------------
                                 Edward E. Matthews, 
                                 Vice President


                                      -9-


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