KRONOS WORLDWIDE INC — Director's Dealing 2007

May 21, 2007

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: KRONOS WORLDWIDE INC (KRO)
CIK: 0001257640
Period of Report: 2007-05-17

Reporting Person: SIMMONS GLENN R (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2007-05-17	Common Stock $0.01 par value	A	500	—	Acquired	1708	Direct

Footnotes

F1: Shares issued for no cash consideration to nonemployee directors under the Kronos Worldwide, Inc. 2003 Long-Term Incentive
Plan.