X0303 4 2010-09-22 0001257640 KRONOS WORLDWIDE INC KRO 0001037854 SIMMONS HAROLD C 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 1 1 1 0 Chairman of the Board 0000024240 CONTRAN CORP 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 0000059255 VALHI INC /DE/ 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 0001338019 VALHI HOLDING CO 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 0001074787 DIXIE RICE AGRICULTURE CORP INC 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 0001011657 TITANIUM METALS CORP 5430 LBJ FREEWAY, SUITE 1700 DALLAS TX 75240 0 0 1 0 0001074791 TIMET FINANCE MANAGEMENT CO 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 Common Stock $0.01 par value 2010-09-22 4 J 0 1000 37.25 A 85667 I by TFMC Common Stock $0.01 par value 258720 D Common Stock $0.01 par value 28995021 I by Valhi Common Stock $0.01 par value 17609635 I by NL Common Stock $0.01 par value 54856 I by Spouse Common Stock $0.01 par value 2686 I by Contran Open market purchase by TIMET Finance Management Company. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing. Directly held by TIMET Finance Management Company. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing. Directly held by Valhi, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing. Directly held by NL Industries, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship among the persons joining in this filing. Directly held by the reporting person's wife. Mr. Simmons disclaims beneficial ownership of any shares of the issuer's common stock that his wife holds. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing. Directly held by Contran Corporation. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship among the persons joining in this filing. Exhibit Index Exhibit 99 - Additional Information A. Andrew R. Louis. Attorney-in-fact, for Harold C. Simmons 2010-09-22 A. Andrew R. Louis. Secretary, for Contran Corporation 2010-09-22 A. Andrew R. Louis. Secretary, for Valhi, Inc. 2010-09-22 A. Andrew R. Louis. Secretary, for Valhi Holding Corporation 2010-09-22 A. Andrew R. Louis. Secretary, for Dixie Rice Agricultural Corporation, Inc. 2010-09-22 A. Andrew R. Louis. Assistant Secretary, for Titanium Metals Corporation 2010-09-22 A. Andrew R. Louis. Secretary, for NL Industries, Inc. 2010-09-22 Gregory M. Swalwell. Vice President, for TIMET Finance Management Company 2010-09-22