VALHI INC /DE/
SC 13D/A, 2000-08-17
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. 13)*

                               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)

                                 August 8, 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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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 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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,872,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,872,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,872,188

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

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

                      76.2%

    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

                      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                                     4,875,694
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,875,694

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,875,694

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

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

                      76.3%

    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 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                                     5,072,188
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,072,188

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      5,072,188

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

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

                      79.3%

    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 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                                     5,079,441
           EACH

        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON

           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      5,079,441

    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. 13

                                 TO SCHEDULE 13D

         This amended  statement on Schedule 13D (this  "Statement")  relates to
the  common  stock,  par value  $1.00  per  share  (the  "Shares"),  of  Tremont
Corporation, a Delaware corporation (the "Company"). Items 2, 3, 4 and 5 of this
Statement are hereby amended as set forth below.

Item 2.  Identity and Background.

         Item 2 is amended as follows:

         (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 Combined Master Retirement Trust (the "CMRT") and
the Harold Simmons  Foundation,  Inc. (the  "Foundation") 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,  the  Foundation  and the CMRT are the direct
holders of approximately 60.0%, 8.4%, 7.8%, 3.1% 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%,  1.6%,  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 Foundation  directly holds  approximately  3.1% of the  Outstanding
Shares and 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.

         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.

         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 is 16825  Northchase  Drive,
Suite 1200,  Houston,  Texas 77060. The business  addresses of the directors and
executive  officers of the Reporting Persons are set forth on Schedule B to this
Statement and incorporated herein by reference.

         (c)      NL formed TRE Holdings to hold and acquire Shares.

         (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.  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.

         Item 3 is amended as follows.

         The total  amount of funds  Valhi  used to acquire  the Shares  that it
purchased as reported in Item 5(c) was $280,840.00.  Such funds were provided by
Valhi's cash on hand.

         The total amount of funds TRE Holdings  used to acquire the Shares that
it  purchased  as  reported  in Item 5(c) was  $16,520,000.00.  Such  funds were
provided by TRE  Holdings'  cash on hand,  all of which were provided by NL as a
capital contribution to TRE Holdings.

         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.

         Item 4 is amended as follows.

         TRE Holdings and Valhi  purchased  the Shares  reported in Item 5(c) of
this  amendment  in order to increase  their  equity  interests  in the Company.
Certain of the Reporting  Persons have  evaluated the  desirability  of filing a
consolidated  federal income tax return. If the Reporting Persons determine that
a consolidated federal income tax return is desirable,  certain of the 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.

         Item 5 is amended as follows.

         (a) Valhi, NL, TRE Holdings, the Foundation,  Harold C. Simmons' spouse
and the CMRT are the direct  beneficial owners of 3,836,021,  536,167,  500,000,
200,000, 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 and Contran may each be deemed to be the beneficial  owner of
         the 4,872,188 Shares  (approximately  76.2% 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
         4,875,694 Shares  (approximately  76.3% of the Outstanding Shares) that
         Valhi, NL, TRE Holdings and the CMRT directly hold;

                  (4) the Foundation may be deemed to be the beneficial owner of
         the 5,072,188 Shares  (approximately  79.3% of the Outstanding  Shares)
         that Valhi, NL, TRE Holdings and the Foundation directly hold; and

                  (5) Harold C. Simmons may be deemed to be the beneficial owner
         of the 5,079,441 Shares (approximately 79.4% of the Outstanding Shares)
         that Valhi, NL, TRE Holdings,  the Foundation,  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 and Contran 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;

                  (5) the  Foundation  may be  deemed to share the power to vote
         and direct the  disposition  of the Shares Valhi,  NL, TRE Holdings and
         the Foundation directly hold; and

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

         (c) The table  below sets forth all  transactions  in the Shares by the
Reporting Persons during the last 60 days. The Reporting Persons effected all of
such 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>
              08/08/00           500,000             $33.0000               Purchase              TRE Holdings
              08/08/00             8,500             $33.0000               Purchase              Valhi
</TABLE>

         (d) Each of Valhi,  NL, TRE  Holdings,  the  Foundation,  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.


<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:  August 17, 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:  August 17, 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:  August 17, 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.

F. Murlyn Broussard (2)                                   Treasurer of Southwest.

Joseph S. Compofelice (3)                                 Chairman  of  the  board,  president  and  chief  executive
                                                          officer of CompX  International  Inc.,  a  manufacturer  of
                                                          computer  support  systems,   drawer  slides  and  security
                                                          products that is  affiliated  with Valhi  ("CompX");  and a
                                                          director of NL and Titanium Metals Corporation,  a producer
                                                          of titanium  metal  products  ("TIMET")  that is affiliated
                                                          with the Company.

Norman S. Edelcup (4)                                     Senior vice  president of Item  Processing of America Inc.,
                                                          a processing service bureau; and a director of Valhi.

Lisa Simmons Epstein                                      Director and president of the Foundation.

David B. Garten (3)                                       Vice  president,  general  counsel and secretary of NL; and
                                                          secretary of TRE Holdings.

Edward J. Hardin (5)                                      Partner  of the law  firm of  Rogers &  Hardin  LLP;  and a
                                                          director of Valhi and CompX.

Robert D. Hardy (3)                                       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 (6)                                      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. (2)                                  President  and a director of  Southwest;  director of Dixie
                                                          Rice; and a private investor.

Harold M. Mire (7)                                        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 (8)                                       President  of Peak  Enernomics,  Inc.,  an energy  industry
                                                          consulting firm; 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 of Keystone
                                                          Consolidated Industries, Inc. ("Keystone"),  a manufacturer
                                                          of steel rod,  wire and wire  products  that is  affiliated
                                                          with  Contran;  director and  executive  vice  president of
                                                          Southwest  and Dixie  Rice;  and a director  of NL,  CompX,
                                                          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 (7)                                      Director and president of Dixie Rice.

Thomas P. Stafford (9)                                    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. (10)                                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 (3)                                    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 Messrs.  Broussard and McCollam is 402
     Canal Street, Houma, Louisiana 70360.

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

(4)  The principal  business  address for Mr. Edelcup is 5190 N.W. 167th Street,
     Suite 114, Miami, Florida 33014.

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

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

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

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

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

(10) 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-

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                                                              200                           -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                                                               60                           -0-

Thomas P. Stafford                                                            -0-                         4,000

Gregory M. Swalwell                                                           -0-                           -0-

J. Walter Tucker, Jr.                                                         525                           -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.


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