KRONOS WORLDWIDE INC — Director's Dealing 2010

Jul 21, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: KRONOS WORLDWIDE INC (KRO)
CIK: 0001257640
Period of Report: 2010-07-19

Reporting Person: SIMMONS HAROLD C (Director, Chairman of the Board, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-07-19	Common Stock $0.01 par value	P	1509	$19.9999	Acquired	254389	Direct
2010-07-19	Common Stock $0.01 par value	P	66	$19.9400	Acquired	254455	Direct
2010-07-19	Common Stock $0.01 par value	P	56	$19.8200	Acquired	254511	Direct
2010-07-19	Common Stock $0.01 par value	P	119	$19.8900	Acquired	254630	Direct
2010-07-19	Common Stock $0.01 par value	P	858	$20.0000	Acquired	255488	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $0.01 par value	28995021	Indirect
Common Stock $0.01 par value	17609635	Indirect
Common Stock $0.01 par value	79567	Indirect
Common Stock $0.01 par value	54856	Indirect
Common Stock $0.01 par value	2686	Indirect

Footnotes

F1: Directly held by Valhi, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship to the reporting person.

F2: Directly held by NL Industries, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship to the reporting person.

F3: Directly held by TIMET Finance Management Company. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship to the reporting person.

F4: Directly held by the reporting person's spouse. The reporting person disclaims beneficial ownership of, and a pecuniary interest in, any shares of the issuer's common stock that his spouse holds.

F5: Directly held by Contran Corporation. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship to the reporting person.