Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Harold C. Simmons Family Trust No. 2
   2. Issuer Name and Ticker or Trading Symbol
COMPX INTERNATIONAL INC [CIX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
THREE LINCOLN CENTER, 5430 LBJ FREEWAY, SUITE 1700		 3. Date of Earliest Transaction (Month/Day/Year)
07/17/2018
(Street)

DALLAS, TX 75240		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock, par value $0.01 per share 07/17/2018   J(1)   10,000,000 A (1) 10,755,104 I By NL (2)
Class A Common Stock, par value $0.01 per share               5,900 I By Contran (3)
Class A Common Stock, par value $0.01 per share               3,000 I By Kronos (4)
Class A Common Stock, par value $0.01 per share               2,000 D (5)  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Harold C. Simmons Family Trust No. 2
THREE LINCOLN CENTER, 5430 LBJ FREEWAY
SUITE 1700
DALLAS, TX 75240		     X    
Simmons Lisa K
THREE LINCOLN CENTER, 5430 LBJ FREEWAY
SUITE 1700
DALLAS, TX 75240		     X    
CONNELLY SERENA S
THREE LINCOLN CENTER, 5430 LBJ FREEWAY
SUITE 1700
DALLAS, TX 75240		     X    
NL INDUSTRIES INC
5430 LBJ FREEWAY, SUITE 1700
DALLAS, TX 75240		     X    

Signatures

 Andrew B. Nace, Attorney-in-fact, for Lisa K.Simmons, Co-Trustee of the Harold C. Simmons Family Trust No. 2   07/18/2018
**Signature of Reporting Person Date
 Andrew B. Nace, Attorney-in-fact, for Serena S. Connelly, Co-Trustee of the Harold C. Simmons Family Trust No. 2   07/18/2018
**Signature of Reporting Person Date
 Andrew B. Nace, Executive Vice President of NL Industries, Inc.   07/18/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) On July 17, 2018, NL Industries, Inc. ("NL") converted all its 10,000,000 shares of class B common stock, par value $0.01 per share (the "Class B Shares") of CompX International Inc. ("CompX") into 10,000,000 shares of class A common stock, par value $0.01 per share, of CompX, for no additional consideration, pursuant to the terms of the Second Amended and Restated Certificate of Incorporation of CompX.
(2) Directly held by NL. See Exhibit 99.1 to this statement for a description of the relationship of additional persons who may be deemed to beneficially own these shares.
(3) Directly held by Contran Corporation. See Exhibit 99.1 to this statement for a description of the relationship of additional persons who may be deemed to beneficially own these shares.
(4) Directly held by Kronos Worldwide, Inc. See Exhibit 99.1 to this statement for a description of the relationship of additional persons who may be deemed to beneficially own these shares.
(5) Directly held by Serena Simmons Connelly.

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