Sec Form 4 Filing - Harold C. Simmons Family Trust No. 2 @ COMPX INTERNATIONAL INC - 2018-07-17

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 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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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 (MM/DD/YY) 07/17/2018 (Street) DALLAS, TX75240 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 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 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 o f 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, TX75240 X Simmons Lisa K THREE LINCOLN CENTER, 5430 LBJ FREEWAY SUITE 1700 DALLAS, TX75240 X CONNELLY SERENA S THREE LINCOLN CENTER, 5430 LBJ FREEWAY SUITE 1700 DALLAS, TX75240 X NL INDUSTRIES INC 5430 LBJ FREEWAY, SUITE 1700 DALLAS, TX75240 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:

( 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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

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