UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of Registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporat ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-31763 (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of principal executive offices) Re ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of registrant as specified in its charter) For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to DELAWARE 76-0294959 (State or other jurisdiction of incorp ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incor ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of Registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporat ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporation or organization) Was ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended June 30, 2019 Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of principal exec ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended March 31, 2019 Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of principal exe ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities and Exchange Act of 1934: For the fiscal year ended December 31, 2018 Commission file number 1-31763 KRONOS WORLDWIDE, INC. (Exact name of Registrant as specified in its charter) DELAWARE 76-0294959 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of pr ...