Results of Operations and Financial Condition. The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports Second Quarter 2026 Results” that the registrant issued on August 5, 2026, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of…

Regulation FD Disclosure ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Announces Quarterly Dividend ” that the registrant also issued on August 5, 2026, a copy of which is attached hereto as Exhibit 99.2 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.2 to this current report is not “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherw…

Results of Operations and Financial Condition. The registrant hereby furnishes the information set forth in its press release issued on May 6, 2026, a copy of which is attached as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to the current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. Registration statements o…

Results of Operations and Financial Condition. The registrant hereby furnishes the information set forth in its press release issued on March 9, 2026, a copy of which is attached as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to the current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. Registration statements…

CEO — James M. Buch: James M. Buch retired as CEO and director, succeeded by Brian W. Christian.

Results of Operations and Financial Condition. The registrant hereby furnishes the information set forth in its press release issued on November 6, 2025, a copy of which is attached as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to the current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. Registration stateme…

Creation of Direct Financial Obligation or an Obligation under and Off-Balance Sheet Arrangement of a Registrant. ​ The disclosure set forth in

Entry into a Material Definitive Agreement. Private Placement of Additional Notes On September 15, 2025, Kronos International, Inc. (the “Issuer”), a wholly owned subsidiary of Kronos Worldwide, Inc. (the “Company”), completed the institutional private placement of €75 million in aggregate principal amount of 9.50% senior secured notes due 2029 (the “New Notes”). The New Notes were issued as additional notes to the existing €351,174,000 aggregate principal amount of 9.50% senior secured notes…

Regulation FD Disclosure. On September 3, 2025, Kronos Worldwide, Inc. (“Kronos”) issued a press release announcing that that its wholly-owned subsidiary, Kronos International, Inc., has agreed to sell €75 million principal amount of senior secured notes due 2029 through an institutional private placement (the “Notes Offering”). Subject to customary closing conditions, the Notes Offering is expected to occur on or about September 15, 2025. ​ A copy of the press release is attached hereto as E…

Regulation FD Disclosure. ​ Senior Notes Offering ​ On September 3, 2025, Kronos Worldwide, Inc. (“Kronos” or the “Company”) issued a press release announcing a private offering through an institutional private placement of €75 million of senior secured notes of its wholly-owned subsidiary, Kronos International, Inc. (the “Notes Offering”), subject to market conditions and other factors. ​ A copy of the press releases is attached hereto as Exhibit 99.1 and is incorporated by reference herein…

Results of Operations and Financial Condition. ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports Second Quarter 2025 Results” that the registrant issued on August 6, 2025, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act…

Regulation FD Disclosure ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Announces Quarterly Dividend ” that the registrant also issued on August 6, 2025, a copy of which is attached hereto as Exhibit 99.2 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.2 to this current report is not “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherw…

CFO — Tim C. Hafer: Mr. Hafer is retiring as CFO with a named successor, Bradley E. Troutman.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. ​ The information required by

Entry into a Material Definitive Agreement. ​ On July 17, 2025, Kronos Worldwide, Inc. (“Kronos”), together with its direct or indirect operating subsidiaries Kronos Louisiana, Inc., Kronos (US), Inc., Kronos Canada, Inc., Kronos Europe NV, and Kronos Titan GmbH, entered into a fourth amendment (the “Fourth Amendment”) to its Credit Agreement dated as of April 20, 2021 (as previously amended, the “Credit Agreement”) with Wells Fargo Bank, National Association, as administrative agent, and the…

President and Chief Operating Officer — Brian W. Christian: Brian W. Christian was promoted to President and Chief Operating Officer.

Results of Operations and Financial Condition. ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports First Quarter 2025 Results” that the registrant issued on May 7, 2025, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1…

Results of Operations and Financial Condition. ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports Fourth Quarter 2024 Results” that the registrant issued on March 6, 2025, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act o…

Entry into a Material Definitive Agreement. ​ On December 19, 2024, Kronos Worldwide, Inc. (“Kronos”), together with its direct or indirect operating subsidiaries Kronos Louisiana, Inc., Kronos (US), Inc., Kronos Canada, Inc., Kronos Europe NV, and Kronos Titan GmbH, entered into a third amendment (the “Third Amendment”) to its Credit Agreement dated as of April 20, 2021 (as previously amended, the “Credit Agreement”) with Wells Fargo Bank, National Association, as administrative agent, and t…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. ​ The information required by

Results of Operations and Financial Condition. ​ The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports Third Quarter 2024 Results” issued on November 6, 2024, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended…

Results of Operations and Financial Condition. The registrant hereby furnishes the information set forth in its press release entitled “Kronos Worldwide, Inc. Reports Second Quarter 2024 Results” that the registrant issued on August 7, 2024, a copy of which is attached hereto as Exhibit 99.1 and incorporated herein by reference. ​ The press release the registrant furnishes as Exhibit 99.1 to this current report is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of…

Entry into a Material Definitive Agreement. Private Placement of Additional Notes On July 30, 2024, Kronos International, Inc. (the “Issuer”), a wholly owned subsidiary of Kronos Worldwide, Inc. (the “Company”), completed the institutional private placement of €75 million in aggregate principal amount of 9.50% senior secured notes due 2029 (the “New Notes”). The New Notes were issued as additional notes to the existing €276,174,000 aggregate principal amount of 9.50% senior secured notes due…

Creation of Direct Financial Obligation or an Obligation under and Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth in

Other Events. On July 23, 2024, Kronos Worldwide, Inc. (“Kronos”) issued a press release announcing a private offering of €75 million of senior secured notes of its wholly-owned subsidiary, Kronos International, Inc., subject to market conditions and other factors. Later on July 23, 2024, Kronos issued a press release announcing that Kronos International, Inc. has agreed to sell €75 million principal amount of senior secured notes due 2029 through an institutional private placement (the “Note…