VALHI INC /DE/
SC 13D/A, 2000-10-24
SUGAR & CONFECTIONERY PRODUCTS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 15)*

                               TREMONT CORPORATION
                                (Name of Issuer)

                          Common Stock, $1.00 par value
                         (Title of Class of Securities)

                                   894745 20 7
                                 (CUSIP Number)

                                STEVEN L. WATSON
                              THREE LINCOLN CENTRE
                                   SUITE 1700
                                5430 LBJ FREEWAY
                            DALLAS, TEXAS 75240-2694
                                 (972) 233-1700
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                October 10, 2000
                      (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  that is the  subject of this  Schedule  13D,  and is
filing  this  schedule  because  of  sections   240.13d-1(e),   240.13d-1(f)  or
240.13d-1(g), check the following box. [ ]

         *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 disclosures provided in a prior cover page.

         The information  required on 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).

                         (Continued on following pages)



<PAGE>


CUSIP No.  894745 20 7

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

                      Tremont Holdings, LLC

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                       500,000
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                        500,000

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      500,000

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      7.8%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      OO



<PAGE>


CUSIP No.  894745 20 7

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

                      NL Industries, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      New Jersey

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     1,036,167
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      1,036,167

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      1,036,167

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      16.2%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Valhi, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      WC and BK

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Valhi Group, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Nevada

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      National City Lines, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      NOA, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Dixie Holding Company

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Dixie Rice Agricultural Corporation, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Louisiana

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Southwest Louisiana Land Company, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Louisiana

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Contran Corporation

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Delaware

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      Harold Simmons Foundation, Inc.

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,044,588
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,044,588

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,044,588

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      78.9%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO



<PAGE>


CUSIP No.  894745 20 7

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

                      The Combined Master Retirement Trust

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)

             (a)  [   ]

             (b)  [   ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not Applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      Texas

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,048,094
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,048,094

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,048,094

    12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [  ]

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

                      79.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      EP



<PAGE>


CUSIP No.  894745 20 7

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

                      Harold C. Simmons

     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

             (a)  [  ]

             (b)  [  ]

     3       SEC USE ONLY



     4       SOURCE OF FUNDS (SEE INSTRUCTIONS)

                      Not applicable

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


     6       CITIZENSHIP OR PLACE OF ORGANIZATION

                      USA

                               7      SOLE VOTING POWER

                                                            -0-
        NUMBER OF
          SHARES               8      SHARED VOTING POWER
       BENEFICIALLY
         OWNED BY                                     5,051,841
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,051,841

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      -0-

    12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
             CERTAIN SHARES (SEE INSTRUCTIONS)  [ X ]

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

                      0.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      IN



<PAGE>


                                AMENDMENT NO. 15
                                 TO SCHEDULE 13D

         This  statement on Schedule  13D is hereby  amended and restated in its
entirety as set forth  below,  except for Items 3 and 4, which are only  amended
(collectively, this "Statement").

Item 1.  Security and Issuer.

         This Statement  relates to shares of the common stock,  $1.00 par value
per share (the "Shares"), of Tremont Corporation (the "Company").  The principal
executive  offices of the  Company  are  located at 1999  Broadway,  Suite 4300,
Denver, Colorado 80202.

Item 2.  Identity and Background.

         (a)  This  Statement  is  filed  by (i)  Tremont  Holdings,  LLC  ("TRE
Holdings"),  NL Industries,  Inc. ("NL") and Valhi, Inc. ("Valhi") as the direct
holders  of  Shares,  (ii) by virtue of the direct  and  indirect  ownership  of
securities of NL and Valhi (as described below in this Statement),  Valhi Group,
Inc. ("VGI"),  National City Lines, Inc. ("National"),  NOA, Inc. ("NOA"), Dixie
Holding Company ("Dixie  Holding"),  Dixie Rice Agricultural  Corporation,  Inc.
("Dixie Rice"),  Southwest Louisiana Land Company, Inc.  ("Southwest"),  Contran
Corporation ("Contran"),  the Harold Simmons Foundation, Inc. (the "Foundation")
and the Combined Master Retirement Trust (the "CMRT") and (iii) by virtue of his
positions  with Contran and certain of the other  entities (as described in this
Statement),  Harold C.  Simmons  (collectively,  the  "Reporting  Persons").  By
signing this  Statement,  each  Reporting  Person agrees that this  Statement is
filed on its or his behalf.

         Valhi,  NL,  TRE  Holdings  and the  CMRT  are the  direct  holders  of
approximately 62.7%, 8.4%, 7.8% and 0.1%, respectively,  of the 6,393,258 Shares
outstanding as of July 31, 2000 according to the Company's  Quarterly  Report on
Form  10-Q for the  quarter  ended  June 30,  2000 (the  "Outstanding  Shares").
Together, Valhi, NL and TRE Holdings may be deemed to control the Company. NL is
the sole member of TRE Holdings and may be deemed to control TRE Holdings. Valhi
and the  Company  are the  direct  holders  of  approximately  60.1% and  20.4%,
respectively,  of the outstanding  common stock of NL and together may be deemed
to control NL. VGI,  National,  Contran,  the Foundation,  the Contran  Deferred
Compensation  Trust No. 2 (the "CDCT No. 2") and the CMRT are the direct holders
of 81.7%, 9.5%, 1.7%, 0.5%, 0.4% and 0.1%, respectively,  of the common stock of
Valhi.  Together,  VGI,  National  and Contran  may be deemed to control  Valhi.
National,  NOA and Dixie Holding are the direct holders of approximately  73.3%,
11.4% and 15.3%, respectively, of the outstanding common stock of VGI. Together,
National,  NOA and Dixie  Holding may be deemed to control VGI.  Contran and NOA
are the direct holders of approximately  85.7% and 14.3%,  respectively,  of the
outstanding  common  stock of  National  and  together  may be deemed to control
National.  Contran and Southwest are the direct holders of  approximately  49.9%
and 50.1%, respectively, of the outstanding common stock of NOA and together may
be  deemed  to  control  NOA.  Dixie  Rice is the  direct  holder of 100% of the
outstanding  common  stock of Dixie  Holding and may be deemed to control  Dixie
Holding.  Contran is the holder of 100% of the outstanding common stock of Dixie
Rice  and may be  deemed  to  control  Dixie  Rice.  Contran  is the  holder  of
approximately  88.9% of the  outstanding  common stock of  Southwest  and may be
deemed to control Southwest.

         Substantially all of Contran's  outstanding voting stock is held either
by trusts  established for the benefit of certain children and  grandchildren of
Harold C. Simmons (the "Trusts"),  of which Mr. Simmons is the sole trustee,  or
by Mr. Simmons directly.  As sole trustee of each of the Trusts, Mr. Simmons has
the power to vote and direct the disposition of the shares of Contran stock held
by each of the Trusts. Mr. Simmons,  however,  disclaims beneficial ownership of
any shares of Contran stock that the Trusts hold.

         The  Combined  Master  Retirement  Trust (the  "CMRT")  directly  holds
approximately  0.1% of each of the Outstanding Shares and the outstanding shares
of Valhi  common  stock.  Valhi  established  the CMRT as a trust to permit  the
collective  investment  by master  trusts  that  maintain  the assets of certain
employee  benefit plans Valhi and related  companies  adopt.  Mr. Simmons is the
sole trustee of the CMRT and a member of the trust investment  committee for the
CMRT. Mr. Simmons is a participant in one or more of the employee  benefit plans
that invest through the CMRT.

         The Foundation  directly holds  approximately  0.5% of the  outstanding
Valhi common  stock.  The  Foundation is a tax-exempt  foundation  organized for
charitable  purposes.  Harold C.  Simmons is the chairman of the board and chief
executive officer of the Foundation and may be deemed to control the Foundation.

         Valmont Insurance  Company  ("Valmont") and a subsidiary of NL directly
own 1,000,000 shares and 1,186,200 shares, respectively,  of Valhi common stock.
Valhi is the direct  holder of 100% of the  outstanding  common stock of Valmont
and may be deemed to control Valmont. Pursuant to Delaware law, Valhi treats the
shares of Valhi  common  stock  that  Valmont  and the  subsidiary  of NL own as
treasury  stock for voting  purposes and for the purposes of this  Statement are
not deemed outstanding.

         Mr.  Harold C.  Simmons is  chairman  of the board and chief  executive
officer of Valhi, VGI, National,  NOA, Dixie Holding,  Dixie Rice, Southwest and
Contran.  Mr.  Simmons is also chairman of the board of NL and a director of the
Company.

         By virtue of the holding of the offices,  the stock  ownership  and his
service as trustee,  all as described  above,  (a) Mr.  Simmons may be deemed to
control the  entities  described  above and (b) Mr.  Simmons and certain of such
entities  may be deemed  to  possess  indirect  beneficial  ownership  of Shares
directly held by certain of such other entities.  However, Mr. Simmons disclaims
beneficial  ownership of the Shares beneficially owned,  directly or indirectly,
by any of such entities,  except to the extent of his vested beneficial interest
in the Shares held by the CMRT.

         Harold C. Simmons'  spouse is the direct owner of 3,747 Shares,  69,475
shares of NL common stock and 77,000 shares of Valhi common stock.  Mr.  Simmons
may be deemed to share indirect beneficial ownership of such shares. Mr. Simmons
disclaims all such beneficial ownership.

         Certain information  concerning the directors and executive officers of
the Reporting  Persons,  including  offices held by Mr.  Simmons is set forth on
Schedule B attached hereto and incorporated herein by reference.

         (b) The  principal  offices of TRE Holdings and NL are located at 16825
Northchase  Drive,  Suite 1200,  Houston,  Texas 77060. The principal offices of
Valhi,  VGI,  National,  NOA,  Dixie Holding and Contran are located at, and the
business  address  of Harold C.  Simmons  is,  Three  Lincoln  Centre,  5430 LBJ
Freeway, Suite 1700, Dallas, Texas 75240-2697. The principal business address of
Dixie Rice is 600 Pasquiere  Street,  Gueydan,  Louisiana  70542.  The principal
business address of Southwest is 402 Canal Street,  Houma,  Louisiana 70360. The
business  addresses of the remaining  directors  and  executive  officers of the
Reporting Persons are set forth on Schedule B to this Statement and incorporated
herein by reference.

         (c)      TRE Holdings is engaged in holding Shares.

         NL is engaged  through its  subsidiaries  in the production of titanium
dioxide pigments.

         In  addition  to  the   activities   engaged  in  through  NL  and  its
subsidiaries,  Valhi is primarily engaged through its other  subsidiaries in the
titanium metals,  ergonomic  computer  support  systems,  precision ball bearing
slides, security products and waste management industries.

         In  addition  to  activities  engaged  in  through  Valhi and the other
companies Valhi may be deemed to control, as described above, and in addition to
holding the  securities  described  above,  (i) VGI is engaged in holding  notes
receivable;  (ii) National is engaged in holding notes receivable and,  directly
or through  other  companies,  in real estate,  oil and gas  activities  and the
rental and sales of  compressors  and related  products;  (iii) Dixie Holding is
engaged  in  holding  preferred  stock of  Contran;  (iv) NOA is engaged in real
estate  and  holding  notes  receivable;  (v)  Dixie  Rice  is  engaged  in land
management, agriculture and oil and gas activities; (vi) Southwest is engaged in
land  management,  agriculture and oil and gas activities;  and (vii) Contran is
engaged through other companies in the production of, among other things,  steel
rod, wire and wire products.

         Valhi  established  the  CMRT  as a  trust  to  permit  the  collective
investment by master trusts that maintain the assets of certain employee benefit
plans Valhi and related  companies  adopt.  The employee  benefit plans that the
master trusts  participating  in the CMRT fund are subject to the  provisions of
the Employee Retirement Income Security Act of 1974, as amended.

         The  Foundation is a tax-exempt  foundation  organized  for  charitable
purposes.

         (d) None of the  Reporting  Persons or, to the best  knowledge  of such
persons,  any of the  persons  named in  Schedule B to this  Statement  has been
convicted in a criminal  proceeding  in the past five years  (excluding  traffic
violations or similar misdemeanors).

         (e) None of the  Reporting  Persons or, to the best  knowledge  of such
persons,  any person  named in  Schedule B to this  Statement,  was a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
as a result of which such  person was or is  subject  to a  judgment,  decree or
final  order  enjoining  future  violations  of,  or  prohibiting  or  mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.

         (f) TRE Holdings is a Delaware limited liability  company.  NL is a New
Jersey  corporation.  Contran,  Dixie  Holding,  National and Valhi are Delaware
corporations.  VGI is a Nevada  corporation.  NOA is a Texas corporation and the
Foundation  is a Texas  non-profit  corporation.  Dixie Rice and  Southwest  are
Louisiana corporations.  The CMRT is governed by the laws of the state of Texas,
except as those laws are  superseded  by federal law.  Harold C. Simmons and all
the persons  named on Schedule B to this  Statement  are  citizens of the United
States, except as otherwise indicated on such Schedule.

Item 3.  Source and Amount of Funds or Other Consideration.

         No change except for the addition of the following:

         The total amount of funds Valhi used to acquire the Shares purchased by
it as  reported in Item 5(c) was  $4,514,919.90  (including  commissions).  Such
funds were provided by Valhi's cash on hand and amounts Valhi borrowed under the
Credit  Agreement  dated as of  November  6,  1998  among  Valhi,  Inc.  and the
financial institutions from time to time that are a party thereto, as amended by
that certain  First  Amendment  Agreement  dated as of November 5, 1999 and that
certain Second Amendment Agreement dated as of November 3, 2000, copies of which
are attached as Exhibits 1, 2 and 3 to this Statement.

         The Reporting  Persons  understand  that (other than Harold C. Simmons)
the funds  required by the  persons  named in  Schedule B to this  Statement  to
acquire Shares were from such person's personal funds.

Item 4.  Purpose of Transaction.

         No change except for the addition of the following:

         Valhi  purchased the Shares  reported in Item 5(c) of this amendment in
order to increase its equity interest in the Company.

         If certain  Reporting  Persons  determine  that  filing a  consolidated
federal income tax return with the Company is desirable,  such Reporting Persons
could facilitate such result by purchasing additional Shares.

         Depending  upon  their   evaluation  of  the  Company's   business  and
prospects,  and  upon  future  developments  (including,  but  not  limited  to,
performance of the Shares in the market, availability of funds, alternative uses
of funds, the Reporting Persons' tax planning objectives and money, stock market
and general economic conditions), any of the Reporting Persons or other entities
that may be deemed to be affiliated  with Contran may from time to time purchase
Shares, and any of the Reporting Persons or other entities that may be deemed to
be affiliated  with Contran may from time to time dispose of all or a portion of
the Shares held by such  person,  or cease  buying or selling  Shares.  Any such
additional  purchases  or sales of the Shares may be in open market or privately
negotiated transactions or otherwise.

         As described under Item 2 of this  Statement,  Harold C. Simmons may be
deemed to control the Company.

         The  Reporting  Persons  understand  that prior  purchases of Shares by
persons  named in Schedule B to this  Statement  (other than Harold C.  Simmons)
were made for the purpose of each such person's personal investment.

         Except as described in this Item 4, none of the Reporting  Persons nor,
to the best  knowledge of such persons,  any other person named in Schedule B to
this Statement has  formulated  any plans or proposals  which relate to or would
result in any matter  required to be  disclosed  in response to  paragraphs  (a)
through (j) of Item 4 of Schedule 13D.

Item 5.  Interest in Securities of the Issuer.

         (a) Valhi, NL, TRE Holdings, Harold C. Simmons' spouse and the CMRT are
the direct beneficial owners of 4,008,421,  536,167, 500,000, 3,747 and 3,506 of
the Shares, respectively.

         By  virtue  of  the  relationships  described  under  Item  2  of  this
Statement:

                  (1)  NL may  be  deemed  to be  the  beneficial  owner  of the
         1,036,167 Shares  (approximately  16.2% of the Outstanding Shares) that
         NL and TRE Holdings directly hold;

                  (2) Valhi,  VGI,  National,  NOA, Dixie  Holding,  Dixie Rice,
         Southwest,  Contran  and the  Foundation  may each be  deemed to be the
         beneficial  owner of the 5,044,588 Shares  (approximately  78.9% of the
         Outstanding Shares) that Valhi, NL and TRE Holdings directly hold;

                  (3) The CMRT may be deemed to be the  beneficial  owner of the
         5,048,094 Shares  (approximately  79.0% of the Outstanding Shares) that
         Valhi, NL, TRE Holdings and the CMRT directly hold; and

                  (4) Harold C. Simmons may be deemed to be the beneficial owner
         of the 5,051,841 Shares (approximately 79.0% of the Outstanding Shares)
         that Valhi, NL, TRE Holdings, Mr. Simmons' spouse and the CMRT directly
         hold.

         Except  to the  extent  of his  vested  beneficial  interest  in Shares
directly held by the CMRT, Mr.  Simmons  disclaims  beneficial  ownership of all
Shares.

         The Reporting Persons  understand,  based on ownership filings with the
Securities  and  Exchange  Commission  (the  "Commission")  or upon  information
provided  by the  persons  listed on  Schedule  B to this  Statement,  that such
persons may be deemed to own  beneficially the Shares as indicated on Schedule C
to this Statement.

         (b)      By virtue of the relationships described in Item 2:

                  (1) TRE  Holdings may be deemed to share the power to vote and
         direct the disposition of the Shares that TRE Holdings directly holds;

                  (2) NL may be deemed to share the power to vote and direct the
         disposition of the Shares that NL and TRE Holdings directly hold;

                  (3) Valhi,  VGI,  National,  NOA, Dixie  Holding,  Dixie Rice,
         Southwest,  Contran and the  Foundation may each be deemed to share the
         power to vote and direct the  disposition of the Shares that Valhi,  NL
         and TRE Holdings directly hold;

                  (4) The CMRT may be  deemed  to  share  the  power to vote and
         direct the  disposition of the Shares that Valhi,  NL, TRE Holdings and
         the CMRT directly hold; and

                  (5) Harold C. Simmons may be deemed to share the power to vote
         and direct the disposition of the Shares that Valhi,  NL, TRE Holdings,
         Mr. Simmons' spouse and the CMRT directly hold.

         (c) The table  below sets forth all  transactions  in the Shares by the
Reporting  Persons since the last transaction by the Reporting  Persons reported
in Amendment No. 14 to this Schedule 13D. The Reporting  Persons effected all of
the following transactions on the New York Stock Exchange.
<TABLE>
<CAPTION>


                                 Number        Approximate Price Per
                                   of           Share (exclusive of                                  Reporting
                Date             Shares            commissions)             Transaction               Person
              ---------          -------          -------------             -----------            ------------
              <S>                   <C>              <C>                      <C>                     <C>
              10/04/00               9,000           $28.0000                 Purchase                Valhi
              10/05/00               6,000           $28.0000                 Purchase                Valhi
              10/06/00              20,000           $27.5000                 Purchase                Valhi
              10/09/00              19,500           $27.0000                 Purchase                Valhi
              10/10/00              10,500           $26.5238                 Purchase                Valhi
              10/11/00              10,000           $26.5000                 Purchase                Valhi
              10/12/00              20,000           $25.8750                 Purchase                Valhi
              10/13/00              20,000           $25.5000                 Purchase                Valhi
              10/16/00              20,000           $25.5000                 Purchase                Valhi
              10/17/00              20,000           $25.1250                 Purchase                Valhi
              10/19/00              17,400           $24.5000                 Purchase                Valhi
</TABLE>

         (d) Each of Valhi,  NL, TRE Holdings,  Mr. Simmons' spouse and the CMRT
has the right to receive and the power to direct the receipt of dividends  from,
and  proceeds  from the sale of,  the  Shares  directly  held by such  entity or
person.

         (e)      Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationships With Respect
         to Securities of the Issuer.

         None  of the  Reporting  Persons  or,  to the  best  knowledge  of such
persons,  any person  named in Schedule B to this  Statement  has any  contract,
arrangement,  understanding or relationship (legal or otherwise) with any person
with  respect to  securities  of the  Company,  including,  but not  limited to,
transfer or voting of any such securities,  finder's fees, joint ventures, loans
or option  arrangements,  puts or calls,  guarantees  of  profits,  division  of
profits or losses, or the giving or withholding of proxies.

Item 7.  Material to be Filed as Exhibits.

Exhibit 1         Credit  Agreement  dated as of November  6, 1998 among  Valhi,
                  Inc., the financial  institutions from time to time that are a
                  party thereto and Societe  Generale,  Southwest Agency, as the
                  administrative agent, issuing bank and arranger  (incorporated
                  by  reference to Exhibit 1 to Amendment 59 to the Schedule 13D
                  filed on November  23, 1999 with the  Securities  and Exchange
                  Commission by Tremont Corporation,  Valmont Insurance Company,
                  Valhi,  Inc., Valhi Group,  Inc.,  National City Lines,  Inc.,
                  NOA,  Inc.,  Dixie Holding  Company,  Dixie Rice  Agricultural
                  Corporation,  Inc.,  Southwest  Louisiana Land Company,  Inc.,
                  Contran Corporation, The Combined Master Retirement Trust, the
                  Harold  Simmons  Foundation,  Inc.  and Harold C. Simmons with
                  respect to the common stock, par value $0.125 per share, of NL
                  Industries, Inc.).

Exhibit 2         First  Amendment  Agreement dated as of November 5, 1999 among
                  Valhi, Inc., the financial institutions from time to time that
                  are a party thereto and Societe Generale, Southwest Agency, as
                  the   administrative   agent,   issuing   bank  and   arranger
                  (incorporated by reference to Exhibit 2 to Amendment 60 to the
                  Schedule  13D filed on December  14, 1999 with the  Securities
                  and  Exchange  Commission  by  Tremont  Corporation,   Valmont
                  Insurance Company,  Valhi,  Inc., Valhi Group, Inc.,  National
                  City Lines, Inc., NOA, Inc., Dixie Holding Company, Dixie Rice
                  Agricultural  Corporation,   Inc.,  Southwest  Louisiana  Land
                  Company,  Inc.,  Contran  Corporation,   The  Combined  Master
                  Retirement  Trust,  the Harold  Simmons  Foundation,  Inc. and
                  Harold C. Simmons with respect to the common stock,  par value
                  $0.125 per share, of NL Industries, Inc.).

Exhibit 3*        Second Amendment  Agreement dated as of November 3, 2000 among
                  Valhi, Inc., the financial institutions from time to time that
                  are a party thereto and U.S. Bank National  Association as the
                  administrative agent, issuing bank and arranger.

----------
*        Filed herewith.



                                    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:  October 24, 2000




                                                          /s/ Harold C. Simmons
                                                          ----------------------
                                                          Harold C. Simmons
                                                          Signing     in     the
                                                          capacities  listed  on
                                                          Schedule  "A" attached
                                                          hereto             and
                                                          incorporated herein by
                                                          reference.


<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:  October 24, 2000




                                                          /s/ J. Landis Martin
                                                          ----------------------
                                                          J. Landis Martin
                                                          Signing     in     the
                                                          capacity   listed   on
                                                          Schedule  "A" attached
                                                          hereto             and
                                                          incorporated herein by
                                                          reference.


<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:  October 24, 2000





                                                          /s/ Steven L. Watson
                                                          ----------------------
                                                          Steven L. Watson
                                                          Signing     in     the
                                                          capacities  listed  on
                                                          Schedule  "A" attached
                                                          hereto             and
                                                          incorporated herein by
                                                          reference.


<PAGE>


                                   SCHEDULE A


HAROLD C. SIMMONS, in his individual capacity and as trustee for THE COMBINED
MASTER RETIREMENT TRUST.


J. LANDIS MARTIN, as president of each of:

NL INDUSTRIES, INC.
TREMONT HOLDINGS, LLC

STEVEN L. WATSON, as president or vice president of each of:

CONTRAN CORPORATION
DIXIE HOLDING COMPANY
DIXIE RICE AGRICULTURAL CORPORATION, INC.
HAROLD SIMMONS FOUNDATION, INC.
NATIONAL CITY LINES, INC.
NOA, INC.
SOUTHWEST LOUISIANA LAND COMPANY, INC.
VALHI GROUP, INC.
VALHI, INC.


<PAGE>


                                   Schedule B


         The  names  of  the  directors   and  executive   officers  of  Contran
Corporation  ("Contran"),  Dixie Holding Company ("Dixie  Holding"),  Dixie Rice
Agricultural  Corporation,  Inc. ("Dixie Rice"), the Harold Simmons  Foundation,
Inc. (the "Foundation"),  National City Lines, Inc. ("National"), NL Industries,
Inc.  ("NL"),  NOA,  Inc.  ("NOA"),   Southwest  Louisiana  Land  Company,  Inc.
("Southwest"),  Valhi Group, Inc. ("VGI") and Valhi, Inc.  ("Valhi"),  and their
present  principal   occupations  are  set  forth  below.  Except  as  otherwise
indicated, each such person is a citizen of the United States of America and the
business  address of each such person is 5430 LBJ Freeway,  Suite 1700,  Dallas,
Texas 75240.
<TABLE>
<CAPTION>

                          Name                                           Present Principal Occupation
-----------------------------                             ---------------------------------------------------------
<S>                                                       <C>
Susan E. Alderton (1)                                     Vice president,  treasurer and chief  financial  officer of
                                                          NL  and  Tremont  Holdings,  LLC  ("TRE  Holdings");  and a
                                                          director of Tremont Corporation (the "Company").

Eugene K. Anderson                                        Vice president  of Contran, Dixie  Holding, Dixie Rice,  NOA,
                                                          National, Southwest, VGI and Valhi; and treasurer of the
                                                          Foundation.

Thomas E. Barry (2)                                       Vice president for executive affairs at Southern  Methodist
                                                          University  and  professor of marketing in the Edwin L. Cox
                                                          School  of  Business  at  Southern  Methodist   University;
                                                          director of Valhi; and a director of Keystone  Consolidated
                                                          Industries,  Inc.  ("Keystone"),  a  manufacturer  of steel
                                                          rod,  wire  and  wire  products  that  is  affiliated  with
                                                          Contran.

F. Murlyn Broussard (3)                                   Treasurer of Southwest.

Joseph S. Compofelice (4)                                 Director of NL and Titanium Metals Corporation,  a producer
                                                          of titanium  metal  products  ("TIMET")  that is affiliated
                                                          with the Company.

Norman S. Edelcup (5)                                     Director  of  Valhi;  and  trustee  of the Baron  Funds,  a
                                                          mutual fund group.

Lisa Simmons Epstein                                      Director and president of the Foundation.

David B. Garten (4)                                       Vice  president,  general  counsel and secretary of NL; and
                                                          vice president and secretary of TRE Holdings.

Edward J. Hardin (6)                                      Partner  of the law  firm of  Rogers &  Hardin  LLP;  and a
                                                          director  of  Valhi  and  CompX   International   Inc.,   a
                                                          manufacturer  of  ergonomic   computer   support   systems,
                                                          precision  ball bearing  slides and security  products that
                                                          is affiliated with Valhi ("CompX").

Robert D. Hardy (4)                                       Vice president and controller of NL and TRE Holdings.

J. Mark Hollingsworth                                     Vice  president  and  general  counsel  of  Contran,  Dixie
                                                          Holding,  Dixie Rice,  NOA,  National,  Southwest,  VGI and
                                                          Valhi;  and general  counsel of the  Foundation,  CompX and
                                                          The Combined Master  Retirement  Trust, a trust established
                                                          by Valhi to  permit  the  collective  investment  by master
                                                          trusts  that  maintain  the  assets  of  certain   employee
                                                          benefit  plans  Valhi  and  related  companies  adopt  (the
                                                          "CMRT").

Keith A. Johnson                                          Controller of the Foundation.

William J. Lindquist                                      Director and    senior     vice president  of Contran,
                                                          Dixie Holding, NOA, National and VGI; senior vice president
                                                          of Dixie Rice, Southwest and Valhi.

A. Andrew R. Louis                                        Secretary of Contran,  CompX,  Dixie  Holding,  Dixie Rice,
                                                          NOA, National, Southwest, VGI, and Valhi.

Kelly D. Luttmer                                          Tax director of Contran,  CompX, Dixie Holding, Dixie Rice,
                                                          NOA, National, Southwest, VGI and Valhi.

J. Landis Martin (7)                                      President,  chief  executive  officer and a director of NL;
                                                          president   of  TRE   Holdings;   chairman  of  the  board,
                                                          president  and  chief  executive  officer  of TIMET and the
                                                          Company.

Andrew McCollam, Jr. (3)                                  President  and a director of  Southwest;  director of Dixie
                                                          Rice; and a private investor.

Harold M. Mire (8)                                        Vice president of Dixie Rice and Southwest.

Bobby  D. O'Brien                                         Vice president and treasurer  of Contran, Dixie  Holding,
                                                          Dixie Rice,  NOA,  National, VGI  and  Valhi;   and
                                                          vice    president   of Southwest.

Kenneth R. Peak (9)                                       President,  chief  executive  officer  and  chairman of the
                                                          board of  Contango  Oil & Gas  Company,  a publicly  traded
                                                          independent   oil  and  gas   exploration   and  production
                                                          company; and a director of NL.

Glenn R. Simmons                                          Vice chairman of the board of Contran,  Dixie Holding, NOA,
                                                          National,  VGI and Valhi;  chairman  of the board and chief
                                                          executive  officer  of  CompX;  chairman  of the  board  of
                                                          Keystone;   director  and  executive   vice   president  of
                                                          Southwest  and Dixie Rice;  and a director of NL, TIMET and
                                                          the Company.

Harold C. Simmons                                         Chairman of the  board  and  chief executive  officer  of
                                                          Contran, Dixie Holding,  Dixie  Rice, the  Foundation,  NOA,
                                                          National, Southwest, VGI and Valhi; chairman  of the board
                                                          of NL; director of the Company;  and  trustee and
                                                          member of the trust investment committee of the CMRT.

Richard A. Smith (8)                                      Director and president of Dixie Rice.

Thomas P. Stafford (10)                                   Co-founder   of  Stafford,   Burke  and  Hecker,   Inc.,  a
                                                          consulting company;  director of NL, TIMET and the Company;
                                                          and a director of Allied-Signal,  Inc., CMI Corporation and
                                                          Seagate Technologies, Inc.

Gregory M. Swalwell                                       Vice president and controller of Contran, Dixie Holding, NOA,
                                                          National, VGI and Valhi; and vice president   of   Dixie
                                                          Rice and Southwest.

J. Walter Tucker, Jr. (11)                                President,  treasurer  and a director  of Tucker & Branham,
                                                          Inc.,  a  mortgage  banking,   insurance  and  real  estate
                                                          company;   vice  chairman  of  the  board  of  Keystone;  a
                                                          director  of Valhi;  and a member  of the trust  investment
                                                          committee of the CMRT.

Steven L. Watson                                          Director and president  of Contran, Dixie  Holding, NOA,
                                                          National, VGI and Valhi; director and executive vice
                                                          president of   Dixie Rice  and   Southwest;
                                                          director, vice president and secretary  of  the
                                                          Foundation;  and  a director   of   CompX,
                                                          Keystone and TIMET.

Lawrence A. Wigdor (4)                                    Director and executive vice president of NL.

----------
</TABLE>

(1)      The principal business address for Ms. Alderton is 70 East 55th Street,
         8th Floor,  New York, New York 10022.  Ms. Alderton is a citizen of the
         United Kingdom.

(2)      The  principal  business  address for Dr.  Barry is Southern  Methodist
         University, Perkins Administration Bldg. #224, Dallas, Texas 75275.

(3)      The principal  business  address for Messrs.  Broussard and McCollam is
         402 Canal Street, Houma, Louisiana 70360.

(4)      The principal business address for Messrs.  Compofelice  Garten,  Hardy
         and Wigdor is Two Greenspoint  Plaza,  16825  Northchase  Drive,  Suite
         1200, Houston, Texas 77060.

(5)      The principal  business  address for Mr. Edelcup is 244 Atlantic Isles,
         Sunny Isles Beach, Florida 33160.

(6)      The principal  business address for Mr. Hardin is 229 Peachtree Street,
         N.E., Suite 2700, Atlanta, Georgia 30303.

(7)      The principal  business address for Mr. Martin is 1999 Broadway,  Suite
         4300, Denver, Colorado 80202.

(8)      The  principal  business  address  for  Messrs.  Mire and  Smith is 600
         Pasquiere Street, Gueydan, Louisiana 70542-0010.

(9)      The principal  business  address for Mr. Peak is 2702 Albans,  Houston,
         Texas 77005.

(10)     The  principal  business  address  for Gen.  Stafford  is 1006  Cameron
         Street, Alexandria, Virginia 22314.

(11)     The  principal  business  address  for  Mr.  Tucker  is 400 E.  Central
         Boulevard, Orlando, Florida 32801.


<PAGE>


                                   SCHEDULE C


         Based upon ownership  filings with the  Commission or upon  information
provided by the persons listed on Schedule B to this Statement, such persons may
be deemed to own personally and beneficially Shares, as outlined below:
<TABLE>
<CAPTION>

                           Name                                      Shares Held                  Options Held (1)
             -------------------------------                      ----------------                ----------------
<S>                                                                       <C>                            <C>
Susan E. Alderton (2)                                                         511                         4,000

Eugene K. Anderson                                                            -0-                           -0-

Thomas E. Barry                                                               -0-                           -0-

F. Murlyn Broussard                                                           -0-                           -0-

Joseph S. Compofelice                                                         -0-                           -0-

Norman S. Edelcup                                                             -0-                           -0-

Lisa Simmons Epstein                                                          298                           -0-

David B. Garten                                                               500                        11,500

Edward J. Hardin                                                              -0-                           -0-

Robert D. Hardy                                                               318                           -0-

J. Mark Hollingsworth                                                         -0-                           -0-

Keith A. Johnson                                                              100                           -0-

William J. Lindquist                                                          -0-                           -0-

A. Andrew R. Louis                                                            -0-                           -0-

Kelly D. Luttmer                                                              -0-                           -0-

J. Landis Martin (3)                                                      150,428                        60,000

Andrew McCollam, Jr.                                                          -0-                           -0-

Harold M. Mire                                                                -0-                           -0-

Bobby D. O'Brien                                                              -0-                           -0-

Kenneth R. Peak                                                               -0-                           -0-

Glenn R. Simmons                                                              534                           -0-

Harold C. Simmons (4)                                                       3,747                           -0-

Richard A. Smith                                                               30                           -0-

Thomas P. Stafford                                                            -0-                         4,000

Gregory M. Swalwell                                                           -0-                           -0-

J. Walter Tucker, Jr. (5)                                                     875                           -0-

Steven L. Watson                                                            4,474                           -0-

Lawrence A. Wigdor                                                            -0-                           -0-

----------
</TABLE>

(1)      Represents  Shares issuable  pursuant to the exercise within 60 days of
         the date of this Statement of stock options.

(2)      Includes 11 Shares held by the trustee for the benefit of Ms.  Alderton
         under the NL Industries,  Inc. Retirement Savings Plan (the "NL Savings
         Plan").

(3)      Includes  (i) 520 Shares  held by the  trustee  for the  benefit of Mr.
         Martin under the NL Savings Plan,  (ii) 1,800 Shares Mr.  Martin's wife
         holds,  (iii) 2,400 Shares the Martin Children's Trust No. II holds for
         which Mr.  Martin is the sole  trustee  and (iv) 100  shares one of Mr.
         Martin's daughters hold.

(4)      These are Shares that Mr. Simmons' wife directly holds. Mr. Simmons may
         also be deemed to possess  indirect  beneficial  ownership of the other
         Shares described in Item 5(a) of this Statement.  Mr. Simmons disclaims
         beneficial ownership of all Shares,  except to the extent of his vested
         beneficial interest in the Shares the CMRT holds.

(5)      Includes 525 Shares held by Statewide  Guaranty  Title Company of which
         Mr. Tucker owns 100% of the outstanding common stock.


<PAGE>


                                  Exhibit Index

Exhibit 1         Credit  Agreement  dated as of November  6, 1998 among  Valhi,
                  Inc., the financial  institutions from time to time that are a
                  party thereto and Societe  Generale,  Southwest Agency, as the
                  administrative agent, issuing bank and arranger  (incorporated
                  by  reference to Exhibit 1 to Amendment 59 to the Schedule 13D
                  filed on November  23, 1999 with the  Securities  and Exchange
                  Commission by Tremont Corporation,  Valmont Insurance Company,
                  Valhi,  Inc., Valhi Group,  Inc.,  National City Lines,  Inc.,
                  NOA,  Inc.,  Dixie Holding  Company,  Dixie Rice  Agricultural
                  Corporation,  Inc.,  Southwest  Louisiana Land Company,  Inc.,
                  Contran Corporation, The Combined Master Retirement Trust, the
                  Harold  Simmons  Foundation,  Inc.  and Harold C. Simmons with
                  respect to the common stock, par value $0.125 per share, of NL
                  Industries, Inc.).

Exhibit 2         First  Amendment  Agreement dated as of November 5, 1999 among
                  Valhi, Inc., the financial institutions from time to time that
                  are a party thereto and Societe Generale, Southwest Agency, as
                  the   administrative   agent,   issuing   bank  and   arranger
                  (incorporated by reference to Exhibit 2 to Amendment 60 to the
                  Schedule  13D filed on December  14, 1999 with the  Securities
                  and  Exchange  Commission  by  Tremont  Corporation,   Valmont
                  Insurance Company,  Valhi,  Inc., Valhi Group, Inc.,  National
                  City Lines, Inc., NOA, Inc., Dixie Holding Company, Dixie Rice
                  Agricultural  Corporation,   Inc.,  Southwest  Louisiana  Land
                  Company,  Inc.,  Contran  Corporation,   The  Combined  Master
                  Retirement  Trust,  the Harold  Simmons  Foundation,  Inc. and
                  Harold C. Simmons with respect to the common stock,  par value
                  $0.125 per share, of NL Industries, Inc.).

Exhibit 3*        Second Amendment  Agreement dated as of November 3, 2000 among
                  Valhi, Inc., the financial institutions from time to time that
                  are a party thereto and U.S. Bank National  Association as the
                  administrative  agent,  issuing  bank  and  arranger.  Certain
                  exhibits,  annexes and similar  attachments  to this Exhibit 3
                  have not been filed; upon request,  the Reporting Persons will
                  furnish supplementally to the Commission a copy of any omitted
                  exhibit, annex or attachment.

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*        Filed herewith.



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