On December 16, 2021, James W. Brown, executive vice president of Kronos Worldwide, Inc.(registrant), provided notice to Kronos Worldwide, Inc. of his retirement, effective as of December 31, 2021, as an officer. In connection with his retirement as an officer of the Kronos Worldwide, Inc., Mr. Brown also provided notice to the registrant's affiliate Valhi, Inc. (Valhi) of his retirement as an officer of Valhi as of December 31, 2021.