VALHI INC /DE/
SC 13D/A, 2000-03-28
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. 12)*

                               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)

                                 March 16, 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)


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                                       536,167
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                        536,167

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      536,167

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

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

                      8.4%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,363,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,363,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,363,688

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

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

                      68.0%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,367,194
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,367,194

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,367,194

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

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

                      68.1%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      EP


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                                     4,563,688
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                                      4,563,688

    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                      4,563,688

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

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

                      71.1%

    14       TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

                      CO


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                                     4,570,941
           EACH
        REPORTING              9      SOLE DISPOSITIVE POWER
          PERSON
           WITH                                             -0-

                               10     SHARED DISPOSITIVE POWER

                                               4,570,941

    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


                                AMENDMENT NO. 12
                                 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, 5 and 7 of this Statement
are hereby amended as set forth below.

Item 2.  Identity and Background.

     Item 2 is amended and restated as follows:

     (a) This  Statement is filed by (i) 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 and NL are the direct holders of approximately  59.7% and 8.4% of the
6,415,820  Shares  outstanding  as of March 22, 2000  according  to  information
provided by the Company (the "Outstanding  Shares").  Valhi and NL may be deemed
to  control  the  Company.  Valhi and the  Company  are the  direct  holders  of
approximately 59.5% and 20.2%, respectively,  of the outstanding common stock of
NL and together  may be deemed to control NL. VGI,  National and Contran are the
direct holders of 81.8%, 9.5% and 1.2% of the outstanding 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  owned by Valmont  and NL 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 NL is 16825  Northchase  Drive,  Suite 1200,
Houston, Texas 77060. The principal offices of Valhi, VGI, National,  NOA, Dixie
Holding,  Contran,  the CMRT and the Foundation 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) NL is engaged  through its  subsidiaries  in the production of titanium
dioxide pigments.

     In  addition  to the  activities  engaged in through  NL,  Valhi is engaged
through its  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.

     The  CMRT  is 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 employee benefit plans funded by
the master trusts participating in the CMRT 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) 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.

     Item 3 is amended as follows.

     On December  30,  1999,  Valmont  distributed  to Valhi by dividend  30,490
Shares.

     The total amount of funds Valhi used to acquire the Shares  purchased by it
as reported in Item 5(c) was $11,161,186.25. Such funds were provided by amounts
Valhi  borrowed from Contran  pursuant to a $25 million demand  promissory  note
dated February 1,  1999 executed by Valhi and payable to the order of Contran, a
copy of which is attached as Exhibit 1 to this Statement. Valhi expects to repay
all  this  borrowing  by  borrowing  under  the  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,  as amended by that certain
First  Amendment  Agreement  dated as of November  5, 1999,  copies of which are
attached as Exhibits 2 and 3 to this Statement.

     The total amount of funds NL used to acquire the Shares  purchased by it as
reported in Item 5(c) was  $9,520,000.00.  Such funds were provided by NL's cash
on hand.

Item 4.  Purpose of Transaction.

     Item 4 is amended as follows.

     Valmont distributed to Valhi by dividend 30,490 Shares in order to increase
Valhi's direct ownership of the Company.

     Valhi and NL purchased the Shares  reported in Item 5(c) of this  amendment
in order to increase their equity interests in the Company.

     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,  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 and restated as follows.

     (a) Valhi,  NL, the Foundation,  Harold C. Simmons' spouse and the CMRT are
the direct beneficial owners of 3,827,521,  536,167, 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  536,167  Shares
(approximately 8.4% of the Outstanding Shares) that NL directly holds;

     (2) Valhi, VGI,  National,  NOA, Dixie Holding,  Dixie Rice,  Southwest and
Contran may each be deemed to be the  beneficial  owner of the 4,363,688  Shares
(approximately 68.0% of the Outstanding Shares) that Valhi and NL directly hold;

     (3) The CMRT may be  deemed  to be the  beneficial  owner of the  4,367,194
Shares  (approximately  68.1% of the Outstanding  Shares) that Valhi, NL and the
CMRT directly hold;

     (3)  the  Foundation  may be  deemed  to be  the  beneficial  owner  of the
4,563,688 Shares  (approximately 71.1% of the Outstanding Shares) that Valhi, NL
and the Foundation directly hold; and

     (4)  Harold C.  Simmons  may be deemed  to be the  beneficial  owner of the
4,570,941 Shares (approximately 71.2% of the Outstanding Shares) that Valhi, NL,
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) NL may be deemed to share the power to vote and direct the  disposition
of the Shares that NL directly holds;

     (2) 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 and NL directly hold;

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

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

     (4) Harold C.  Simmons  may be deemed to share the power to vote and direct
the  disposition  of the Shares that Valhi,  NL, 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
                Date               Shares             commissions)              Transaction            Reporting Person
              ---------          ----------       ----------------------        -----------            ----------------
              <S>                   <C>                <C>                      <C>                    <C>

              03/03/00               75,000            $13.6875                 Purchase               Valhi
              03/06/00               49,500            $14.2500                 Sale                   Foundation
              03/06/00                  500            $14.3125                 Sale                   Foundation
              03/16/00               44,500            $13.6875                 Purchase               Valhi
              03/16/00              500,000            $19.0000                 Purchase               Valhi
              03/16/00              500,000            $19.0000                 Purchase               NL

</TABLE>

     (d) Each of Valhi, NL, the Foundation, Valmont, 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 7.  Material to be Filed as Exhibits.

     Item 7 is amended and restated as follows:

Exhibit 1           $25 Million Demand Promissory Note dated  February 1,  1999
                    executed by Valhi, Inc. and payable to the order
                    of Contran Corporation (incorporated by reference to Exhibit
                    1 to Amendment No. 11 to this Statement).

Exhibit 2           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 3           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.).


                                    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:  March 27, 2000




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

                                    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:  March 27, 2000




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

                                    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:  March 27, 2000





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

                                   SCHEDULE A


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


J.  LANDIS  MARTIN,   as  president  and  chief  executive  officer  of  NL
INDUSTRIES, INC.


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.

                                   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 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.

Kenneth R. Ferris (5)                                     Distinguished  Professor at the American Graduate School of
                                                          International Management; and a director of Valhi.

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

Robert D. Hardy (3)                                       Vice president and controller of NL.

Edward J. Hardin (6)                                      Partner  of the law  firm of  Rogers &  Hardin  LLP;  and a
                                                          director of Valhi and CompX.

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;
                                                          chairman  of  the  board,  president  and  chief  executive
                                                          officer of TIMET and the Company.

Andrew McCollam, Jr. (2)                                  President  and  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)                                       Director of NL; and president of Peak Enernomics,  Inc., an
                                                          energy industry consulting firm.

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 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 (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 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; 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;  director,  vice  president  and
                                                          secretary of the  Foundation;  executive  vice president of
                                                          Southwest; 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 300, Miami, Florida 33014.

(5)  The principal  business  address for Dr. Ferris is 15249 North 59th Avenue,
     Glendale, Arizona 85306-6000.

(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 Mr.  Stafford is 1006 Cameron  Street,
     Alexandria, Virginia 22314.

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

                                   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                          6,500

Eugene K. Anderson                                                           -0-                            -0-

F. Murlyn Broussard                                                          -0-                            -0-

Joseph S. Compofelice                                                        -0-                         5,000

Norman S. Edelcup                                                            -0-                            -0-

Lisa Simmons Epstein                                                        298                             -0-

Kenneth R. Ferris                                                            -0-                            -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                                                          6,274                             -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 held by the CMRT.




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