Kronos Worldwide, Inc. announced that James M. Buch has been elected, effective June 1, 2021, as president and chief operating officer of the registrant by the registrant's board of directors. Upon Mr. Buch's election, Robert D. Graham, who previously served as vice chairman of the board, president and chief executive officer of the registrant, ceased to serve as president of the registrant but continued as its vice chairman of the board and chief executive officer.