X0306 4 2018-07-17 0001049606 COMPX INTERNATIONAL INC CIX 0001600851 Harold C. Simmons Family Trust No. 2 THREE LINCOLN CENTER, 5430 LBJ FREEWAY SUITE 1700 DALLAS TX 75240 0 0 1 0 0001599736 Simmons Lisa K THREE LINCOLN CENTER, 5430 LBJ FREEWAY SUITE 1700 DALLAS TX 75240 0 0 1 0 0001520515 CONNELLY SERENA S THREE LINCOLN CENTER, 5430 LBJ FREEWAY SUITE 1700 DALLAS TX 75240 0 0 1 0 0000072162 NL INDUSTRIES INC 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 Class A Common Stock, par value $0.01 per share 2018-07-17 4 J 0 10000000 A 10755104 I By NL Class A Common Stock, par value $0.01 per share 5900 I By Contran Class A Common Stock, par value $0.01 per share 3000 I By Kronos Class A Common Stock, par value $0.01 per share 2000 D 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. 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. 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. 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. Directly held by Serena Simmons Connelly. Andrew B. Nace, Attorney-in-fact, for Lisa K.Simmons, Co-Trustee of the Harold C. Simmons Family Trust No. 2 2018-07-18 Andrew B. Nace, Attorney-in-fact, for Serena S. Connelly, Co-Trustee of the Harold C. Simmons Family Trust No. 2 2018-07-18 Andrew B. Nace, Executive Vice President of NL Industries, Inc. 2018-07-18