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

SCHEDULE 13D
Under the Securities Exchange Act of 1934

(Amendment No. 28)*

COMPX INTERNATIONAL INC.
(Name of Issuer)

Class A Common Stock, par value $0.01 per share
(Title of Class of Securities)

20563P 10 1
(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)

November 20, 2015
(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. 20563P 10 1
1	NAMES OF REPORTING PERSONS
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 and OO	 	
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	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
758,104	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
758,104	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
758,104	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.4%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

1	NAMES OF REPORTING PERSONS
Kronos Worldwide, 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 OO	 	
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)  ☐
 	 	
6	CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
758,104	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
758,104	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
758,104	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.4%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

CUSIP No. 20563P 10 1
1	NAMES OF REPORTING PERSONS
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 OO	 	
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)  ☐
 	 	
6	CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
758,104	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
758,104	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
758,104	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.4%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

CUSIP No. 20563P 10 1
1	NAMES OF REPORTING PERSONS
Valhi 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	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
758,104	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
758,104	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
758,104	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.4%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

CUSIP No.  20563P 10 1
1	NAMES OF REPORTING PERSONS
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	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
758,104	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
758,104	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
758,104	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.4%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

CUSIP No.  20563P 10 1
1	NAMES OF REPORTING PERSONS
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)
WC and OO	 	
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)  ☐
 	 	
6	CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
764,004	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
764,004	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
764,004	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)  ☐
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
31.7%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
CO	 	 	 	 	 	 	

CUSIP No.  20563P 10 1
1	NAMES OF REPORTING PERSONS
Lisa K. 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)
OO	 	
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)  ☐
 	 	
6	CITIZENSHIP OR PLACE OF ORGANIZATION
USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
         -0-	 	
 	8	SHARED VOTING POWER
764,004	 	 	 	
 	9	SOLE DISPOSITIVE POWER
         -0-	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
764,004	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
-0-	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)   ý
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.0%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN	 	 	 	 	 	 	

CUSIP No.  20563P 10 1
1	NAMES OF REPORTING PERSONS
Serena Simmons Connelly	 	
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)
OO	 	
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
PURSUANT TO ITEMS 2(d) OR 2(e)  ☐
 	 	
6	CITIZENSHIP OR PLACE OF ORGANIZATION
USA	 	
NUMBER OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH	7	SOLE VOTING POWER
     2,000	 	
 	8	SHARED VOTING POWER
764,004	 	 	 	
 	9	SOLE DISPOSITIVE POWER
     2,000	 	 	 	 	 	
 	10	SHARED DISPOSITIVE POWER
764,004	 	 	 	 	 	 	
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,000	 	 	 	 	 	 	
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)   ý
 	 	 	 	 	 	 	
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
0.1%	 	 	 	 	 	 	
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN	 	 	 	 	 	 	

AMENDMENT NO. 28
TO SCHEDULE 13D

Capitalized terms not otherwise defined in this Amendment No. 28 to this Statement on Schedule 13D (this "Statement") shall have the meanings assigned to such terms in Amendment No. 26 to this Statement.  This Statement relates to the class A common stock, par value $0.01 per share (the " Class A Shares "), of CompX International Inc., a Delaware corporation (" CompX ").  Items 2, 4, 5 and 6 of this Statement are hereby amended as set forth below.  The Reporting Persons (as defined below) are filing this amendment as a result of a change of control of CompX resulting from the termination, effective November 20, 2015, of the Voting Agreement.

Item 2.	Identity and Background.	

Item 2 is amended and supplemented as follows.

(a)            The following entities or persons are filing this Statement (collectively, the "Reporting Persons"):

·	NL Industries, Inc. ("NL") as a direct holder of Class A Shares;	

·	Kronos Worldwide, Inc. ("Kronos Worldwide"), Valhi, Inc. ("Valhi"), Valhi Holding Company (" VHC "), Dixie Rice Agricultural Corporation, Inc. (" Dixie Rice "), Contran Corporation (" Contran ") by virtue of their direct or indirect ownership of NL;	

·	Lisa K. Simmons by virtue of her being a co-trustee of the Family Trust (as defined and described below) and her position as co-chair of the Contran board of directors (the " Contran Board "); and	

·	Serena Simmons Connelly by virtue of being co-trustee of the Family Trust and her position as co-chair of the Contran Board.	

By signing this Statement, each Reporting Person agrees that this Statement is filed on its or her behalf.

Effective November 20, 2015, the Voting Agreement was terminated in accordance with its terms.

The following is a description of the relationships among the Reporting Persons.

All of Contran's outstanding voting stock is held by a family trust (the "Family Trust") established for the benefit of Ms. Simmons and Ms. Connelly and their children, for which Ms. Simmons and Ms. Connelly are co-trustees, or is held directly by Ms. Simmons and Ms. Connelly or entities related to them.  Ms. Simmons and Ms. Connelly are half-sisters.

Ms. Simmons and Ms. Connelly also serve as co-chairs of the Contran Board, and two other members of Contran management also serve on the Contran Board.  As co-trustees of the Family Trust, Ms. Simmons and Ms. Connelly have the shared power to vote and direct the disposition of the shares of Contran stock held by the Family Trust, and Ms. Simmons and Ms. Connelly each have the power to vote and direct the disposition of shares of Contran stock they hold directly or which is held by other entities related to them.

Contran is the holder of 100% of the outstanding common stock of Dixie Rice and may be deemed to control Dixie Rice.  Dixie Rice is the direct holder of 100% of the outstanding common stock of VHC and may be deemed to control VHC.

Ms. Simmons and Ms. Connelly directly hold, or are related to the following persons or entities that directly hold, the following percentages of the 2,411,107 Class A Shares outstanding as of the close of business on November 30, 2015 based on information from CompX (the " Outstanding Class A Shares "):
NL                                                                                                                                                  	31.3%	
Contran                                                                                                                                                  	0.2%	
Kronos Worldwide                                                                                                                                                  	0.1%	
Serena Simmons Connelly                                                                                                                                                  	0.1%	

NL also directly holds 100%, or 10,000,000 shares, of CompX's class B common stock, par value $0.01 per share (the "Class B Shares " and collectively with the Class A Shares shall be referred to as the " Shares ").  The relative rights of the Shares are described in Exhibit 3.1 to Amendment No. 1 to CompX's Registration Statement on Form S-1 filed with the U.S. Securities and Exchange Commission (the " SEC ") on February 4, 1998 (Reg. No. 333-42643), which is incorporated herein by reference.  As a result of its ownership of 31.3% of the Class A Shares and 100% of the Class B Shares, NL directly holds approximately 86.7% of the combined voting power (98.4% of the combined voting power for the election of directors) of all classes of voting stock of CompX.  NL may be deemed to control CompX.

Ms. Simmons and Ms. Connelly directly hold, or are related to the following persons or entities that directly hold, the following percentages of the outstanding shares of NL common stock:
Valhi                                                                                                                                                    	82.9%	
Kronos Worldwide                                                                                                                                                    	Less than 0.1%	
Serena Simmons Connelly                                                                                                                                                    	Less than 0.1%	

Together, Valhi and Kronos Worldwide may be deemed to control NL.

Ms. Simmons and Ms. Connelly directly hold, or are related to the following persons or entities that directly hold, the following percentages of the outstanding shares of Kronos Worldwide common stock:
Valhi                                                                                                                                                    	50.0%	
NL                                                                                                                                                    	30.4%	
Contran                                                                                                                                                    	0.1%	

Together, Valhi, NL and Contran may be deemed to control Kronos Worldwide.

Ms. Simmons and Ms. Connelly directly hold, or related to the following persons or entities that directly hold, the following percentages of the outstanding shares of Valhi common stock:
VHC                                                                                                                                                  	92.6%	
Serena Simmons Connelly                                                                                                                                                  	Less than 0.1%	

VHC may be deemed to control Valhi.  Contran may be deemed to control VHC, by virtue of its ownership of Dixie Rice shares.

NL (including a wholly owned subsidiary of NL) and Kronos Worldwide own 14,372,970 shares and 1,724,916 shares, respectively, of Valhi common stock.  As already stated, Valhi is the direct holder of approximately 82.9% of the outstanding shares of common stock of NL and 50.04% of the outstanding shares of Kronos Worldwide common stock.  As a result of Valhi's direct and indirect ownership of NL and Kronos Worldwide and pursuant to Delaware law and Section 13(d)(4) of the Exchange Act, Valhi treats the shares of Valhi common stock that NL and Kronos Worldwide own as treasury stock for voting purposes.  For the purposes of this statement, such shares of Valhi common stock that NL and Kronos Worldwide hold are not deemed outstanding.

By virtue of the stock ownership of each of Kronos Worldwide, NL, Valhi, VHC, Dixie Rice and Contran, the role of Ms. Simmons and Ms. Connelly as co-trustees of the Family Trust, Ms. Simmons and Ms. Connelly being beneficiaries of the Family Trust, the direct holdings of Contran voting stock by each of Ms. Simmons, Ms. Connelly and entities related to them, the positions as co-chairs of the Contran Board by each of Ms. Simmons and Ms. Connelly, in each case as described above,  (a) Ms. Simmons and Ms. Connelly may be deemed to control the Family Trust, Contran, Dixie Rice, VHC, Valhi, NL, Kronos Worldwide and CompX and  (b)  Ms. Simmons and Ms. Connelly, Contran, Dixie Rice, VHC, Valhi, NL and Kronos Worldwide may be deemed to possess indirect beneficial ownership of, and a pecuniary interest in, shares of common stock directly held by such entities, including any Shares.  However, Ms. Simmons and Ms. Connelly each disclaims beneficial ownership of, and such pecuniary interest in, such shares beneficially owned, directly or indirectly, by any of such entities, except to the extent of their direct beneficial ownership in shares of such entities.

The Reporting Persons understand, based on ownership filings with the SEC or upon information provided by the persons listed on  Schedule B  to this Statement, that such persons may be deemed to own beneficially the Class A Shares as indicated on  Schedule C  to this Statement.

Item 4.	Purpose of Transaction.	

Item 4 is amended and supplemented as follows.

Depending upon their evaluation of CompX's business and prospects, and upon future developments (including, but not limited to, performance of the Class A 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 related to Contran may from time to time purchase Shares, and any of the Reporting Persons or other entities that may be deemed to be related to 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 Shares may be in open market or privately negotiated transactions or otherwise.

The information included in Item 2 of this Statement is hereby incorporated herein by reference.  As described under Item 2 of this Statement, Ms. Simmons and Ms. Connelly may be deemed to control CompX.

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 supplemented as follows.

(a)            The following entities or persons directly hold the following Shares:
Reporting Persons	 	Class A Shares Directly Held	 	 	Class B Shares Directly Held	 	
 	 	 	 	 	 	 	
NL  	 	 	755,104	 	 	 	10,000,000	 	
Contran  	 	 	5,900	 	 	 	-0-	 	
Kronos Worldwide  	 	 	3,000	 	 	 	-0-	 	
Serena Simmons Connelly  	 	 	2,000	 	 	 	-0-	 	
Total  	 	 	766,004	 	 	 	10,000,000	 	

By virtue of the relationships described under Item 2 of this Statement, NL, Kronos Worldwide, Valhi, VHC and Dixie Rice may each be deemed to be the beneficial owner of the 758,104 Class A Shares (approximately 31.4% of the Outstanding Class A Shares) and 10,000,000 Class B Shares (approximately 86.7% of the combined voting power, and 98.4% of the combined voting power for the election of directors, of all classes of voting stock of CompX) that NL and Kronos Worldwide hold directly.

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

(1)            NL, Kronos Worldwide, Valhi, VHC and Dixie Rice may each be deemed to share the power to vote and direct the disposition of the 758,104 Class A Shares (approximately 31.4% of the Outstanding Class A Shares) and 10,000,000 Class B Shares (approximately 86.7% of the combined voting power, and 98.4% of the combined voting power for the election of directors, of all classes of voting stock of CompX) that NL and Kronos Worldwide hold directly;

(2)            Contran, Ms. Simmons and Ms. Connelly may be deemed to share the power to vote and direct the disposition of the 764,004 Class A Shares (approximately 31.7% of the Outstanding Class A Shares) and 10,000,000 Class B Shares (approximately 86.7% of the combined voting power, and 98.4% of the combined voting power for the election of directors, of all classes of voting stock of CompX) that NL, Contran and Kronos Worldwide hold directly; and

(3)            Ms. Connelly may be deemed to have the sole power to vote and direct the disposition of the 2,000 Class A Shares (approximately 0.1% of the Outstanding Class A Shares and approximately 0.0% of the combined voting power, and 0.0% of the combined voting power for the election of directors, of all classes of voting stock of CompX) that she directly holds.

(d)            NL, Contran, Kronos Worldwide and Ms. Connelly, each 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)            The Harold Simmons Foundation, Inc. ceased to be the beneficial owner of 5% of the Outstanding Class A Shares upon the final sale of its Valhi common stock on June 30, 2014.  Ms. Annette C. Simmons ceased to be the beneficial owner of 5% of the outstanding Class A Shares upon the termination of the Voting Agreement as described in Item 2(a) of this Statement.

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

Item 6 is amended and supplemented as follows.

The information included in Items 2, 4 and 5 of this Statement is hereby incorporated herein by reference.

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

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: December 2, 2015

/s/ Lisa K. Simmons                                                                                          
Lisa K. 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: December 2, 2015

/s/ Serena Simmons Connelly                                                                                          
Serena Simmons Connelly, 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: December 2, 2015

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

SCHEDULE A

LISA K. SIMMONS, as CO-TRUSTEE of the Family Trust and as CO-CHAIR of the Contran Board.

SERENA SIMMONS CONNELLY, as CO-TRUSTEE of the Family Trust and as CO-CHAIR of the Contran Board.

STEVEN L. WATSON, as VICE CHAIR of the Contran Board and CHAIRMAN OF THE BOARD, PRESIDENT or CHIEF EXECUTIVE OFFICER of each of:

DIXIE RICE AGRICULTURAL CORPORATION, INC.
KRONOS WORLDWIDE, INC.
NL INDUSTRIES, INC.
VALHI HOLDING COMPANY
VALHI, INC.

 
SCHEDULE B

The names of the directors and executive officers of the Reporting Persons 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.
Name	Present Principal Occupation	
 	 	
Thomas E. Barry (1)                                                                                    	Vice president for executive affairs at Southern Methodist University and professor of marketing in the Edwin L. Cox School of Business at Southern Methodist University; and a director of Valhi.	
 	 	
Clarence B. Brown, III                                                                                    	Vice president and general counsel of Kronos Worldwide.	
 	 	
James Buch                                                                                    	Chief operating officer — global commercial of Kronos Worldwide.	
 	 	
Brian W. Christian                                                                                    	Vice president, strategic business development of Kronos Worldwide and senior vice president of Contran.	
 	 	
Benjamin R. Corona                                                                                    	President, global sales management of Kronos Worldwide.	
 	 	
Keith R. Coogan (2)                                                                                    	Private investor and director of Kronos Worldwide.	
 	 	
Serena S. Connelly                                                                                    	Director and co-chair of Contran.	
 	 	
Steven S. Eaton                                                                                    	Vice president and director of internal control over financial reporting of CompX, Kronos Worldwide, NL and Valhi.	
 	 	
Norman S. Edelcup (3)                                                                                    	Chairman of the Sunny Isles Beach Foundation, Inc.; director of CompX and Valhi; and trustee of the Baron Funds, a mutual fund group.	
 	 	
Loretta J. Feehan (4)                                                                                    	Director of CompX, Kronos Worldwide, NL and Valhi; and certified public accountant who consults on financial and tax matters.	
 	 	
L. Andrew Fleck  	Director and vice president of Dixie Rice; and vice president-real estate of Contran.	

Name	Present Principal Occupation	

 	 	
Robert D. Graham                                                                                    	Vice chairman of the board, president and chief executive officer of NL; executive vice president of Kronos Worldwide; executive vice president and chief legal officer of Contran and Valhi, and executive vice president of Dixie Rice and VHC.	
 	 	
Tim C. Hafer                                                                                    	Vice president and controller of Kronos Worldwide and NL.	
 	 	
Janet G. Keckeisen                                                                                    	Vice president, corporate strategy and investor relations of Kronos Worldwide and Valhi.	
 	 	
Patricia A. Kropp                                                                                    	Vice president, director of global human resources of Kronos Worldwide.	
 	 	
A. Andrew R. Louis                                                                                    	Vice president and secretary of CompX, Dixie Rice, Kronos Worldwide, NL, Valhi and VHC; and secretary of Contran.	
 	 	
Kelly D. Luttmer                                                                                    	Executive vice president and chief tax officer of Valhi and Contran; and executive vice president and global tax director of CompX, Dixie Rice, VHC, Kronos Worldwide and NL.	
 	 	
H. Joseph Maas (5)                                                                                    	President, commercial strategy of Kronos Worldwide.	
 	 	
W. Hayden McIlroy (6)                                                                                    	Private investor primarily in real estate; and a director of Valhi.	
 	 	
Cecil H. Moore, Jr. (7)                                                                                    	Private investor; and a director of NL and Kronos Worldwide.	
 	 	
Andrew B. Nace                                                                                    	Senior vice president and general counsel of Contran and Valhi; and vice president of CompX, Kronos Worldwide and NL.	
 	 	
Bobby D. O'Brien                                                                                    	Vice chairman of the board, president and chief executive officer of Kronos Worldwide; executive vice president and director of CompX; executive vice president of NL; director, president and chief financial officer of Valhi, Dixie Rice and VHC; and president and chief financial officer of Contran.	
 	 	
Courtney J. Riley                                                                                    	Vice president, environmental affairs of Kronos Worldwide, NL, Valhi and Contran.	

Name	Present Principal Occupation	

 	 	
Klemens T. Schlüter (8)                                                                                    	Chief operating officer — global operations of Kronos Worldwide.	
 	 	
Lisa K. Simmons                                                                                    	Co-chair of the Contran Board.	
 	 	
Thomas P. Stafford (9)                                                                                    	Director of NL and Kronos Worldwide; chairman of the NASA Advisory Council Task Force on the International Space Station Program.	
 	 	
John A. St. Wrba                                                                                    	Vice president and treasurer of CompX, Contran, Dixie Rice, Kronos Worldwide, NL, Valhi and VHC.	
 	 	
John A. Sunny                                                                                    	Vice president and chief information officer of Contran and Kronos Worldwide.	
 	 	
Gregory M. Swalwell                                                                                    	Executive vice president of CompX, executive vice president, controller and chief accounting officer of Contran and Valhi; executive vice president and controller of Dixie Rice and VHC; and executive vice president and chief financial officer of Kronos Worldwide and NL.	
 	 	
R. Gerald Turner (1)                                                                                    	President of Southern Methodist University; and a director of Kronos Worldwide.	
 	 	
Steven L. Watson                                                                                    	Chairman of the board of CompX, Kronos Worldwide and NL; chairman of the board and chief executive officer of Valhi, Dixie Rice and VHC; and vice chair of the board and chief executive officer of Contran.	
 	 	
C. Kern Wildenthal (10)                                                                                    	President of the Children's Medical Center Foundation and executive vice president of Children's Medical Center of Dallas; and a director of Kronos Worldwide.	
 	 	
Terry N. Worrell (11)                                                                                    	Director of NL; and a private investor with Worrell Investments, Inc., a real estate investment company.	

(1)	The principal business address for Drs. Barry and Turner is Southern Methodist University, Perkins Administration Bldg. #224, Dallas, Texas   75275.	

(2)	The principal address for Mr. Coogan is 5900 Newgate Lane, Plano, Texas  75093.	

(3)	The principal business address for Mr. Edelcup is 17395 North Bay Road, Suite 103, Sunny Isles Beach, Florida   33160.	

(4)	The principal business address for Ms. Feehan is 164 Jackson Street, Denver, Colorado  80206.	

(5)	The principal business address for Mr. Maas is 5 Cedar Brook Drive, Cranbury, New Jersey   08512.	

(6)	The principal business address for Mr. McIlroy is 25 Highland Park Village, Suite 100-341, Dallas, Texas   75225.	

(7)	The address for Mr. Moore is 4444 Beverly Drive, Dallas, Texas   75205.	

(8)	The principal business address for Mr. Schlüter is Pechstraße 5, Leverkusen, NRW 51373, GERMANY.	

(9)	The principal business address for Gen. Stafford (ret.) is Stafford Technology Inc., Suite 102, 4200 Perimeter Center, Oklahoma City, Oklahoma   73112.	

(10)	The address for Dr. Wildenthal is 2777 Stemmons Expressway, Suite 700 Dallas TX 75207.	

(11)	The address for Mr. Worrell is 6909 Vassar, Dallas, Texas   75205.	

 
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 personally beneficially own Class A Shares, as outlined below:
Name	Class A Shares Held	
 	 	
Thomas E. Barry  	-0-	 	
 	 	 	
Clarence B. Brown, III  	-0-	 	
 	 	 	
James Buch  	-0-	 	
 	 	 	
Brian W. Christian  	-0-	 	
 	 	 	
Benjamin R. Corona  	-0-	 	
 	 	 	
Keith R. Coogan  	-0-	 	
 	 	 	
Serena S. Connelly  	2,000	(1)	
 	 	 	
Steven S. Eaton  	-0-	 	
 	 	 	
Norman S. Edelcup  	13,000	 	
 	 	 	
Loretta J. Feehan  	2,000	 	
 	 	 	
L. Andrew Fleck  	-0-	 	
 	 	 	 	
Robert D. Graham  	-0-	 	 	
 	 	 	 	
Tim C. Hafer  	-0-	 	 	
 	 	 	 	
Janet G. Keckeisen  	-0-	 	 	
 	 	 	 	
Patricia A. Kropp  	-0-	 	 	
 	 	 	 	
A. Andrew R. Louis  	-0-	 	 	
 	 	 	 	
Kelly D. Luttmer  	200	 	 	
 	 	 	 	
H. Joseph Maas  	-0-	 	 	
 	 	 	 	
W. Hayden McIlroy  	-0-	 	 	
 	 	 	 	
Cecil H. Moore, Jr.  	-0-	 	 	

Name	Class A Shares Held	
 	 	 	 	
Andrew B. Nace  	-0-	 	 	
 	 	 	 	
Bobby D. O'Brien  	2,300	 	 	
 	 	 	 	
Courtney J. Riley  	-0-	 	 	
 	 	 	 	
Klemens T. Schlüter  	-0-	 	 	
 	 	 	 	
Lisa K. Simmons  	-0-	(2)	 	
 	 	 	 	
Thomas P. Stafford  	-0-	 	 	
 	 	 	 	
John A. St. Wrba  	-0-	 	 	
 	 	 	 	
John A. Sunny  	-0-	 	 	
 	 	 	 	
Gregory M. Swalwell  	-0-	 	 	
 	 	 	 	
R. Gerald Turner.  	-0-	 	 	
 	 	 	 	
Steven L. Watson  	17,000	 	 	
 	 	 	 	
C. Kern Wildenthal  	-0-	 	 	
 	 	 	 	
Terry N. Worrell  	-0-	 	 	

(1)	Does not include other Shares of which Ms. Connelly may be deemed to possess indirect beneficial ownership as described in Items 2 and 5(a) of this Statement.  Except for the 2,000 Class A Shares that she holds directly, Ms. Connelly disclaims beneficial ownership of all Shares.	

(2)	Does not include Shares of which Ms. Simmons may be deemed to possess indirect beneficial ownership as described in Items 2 and 5(a) of this Statement.  Ms. Simmons disclaims beneficial ownership of all Shares.