VALHI INC /DE/ — Director's Dealing 2011

May 16, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: KRONOS WORLDWIDE INC (KRO)
CIK: 0001257640
Period of Report: 2011-05-13

Reporting Person: SIMMONS HAROLD C (Director, Chairman of the Board, 10% Owner)
Reporting Person: CONTRAN CORP (10% Owner)
Reporting Person: VALHI INC /DE/ (10% Owner)
Reporting Person: VALHI HOLDING CO (10% Owner)
Reporting Person: DIXIE RICE AGRICULTURE CORP INC (10% Owner)
Reporting Person: TITANIUM METALS CORP (10% Owner)
Reporting Person: TIMET FINANCE MANAGEMENT CO (10% Owner)
Reporting Person: NL INDUSTRIES INC (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-13	Common Stock $0.01 par value	J	11587	$53.7347	Acquired	98254	Indirect
2011-05-13	Common Stock $0.01 par value	J	82105	$54.8204	Acquired	180459	Indirect
2011-05-13	Common Stock $0.01 par value	J	6308	$55.3305	Acquired	186667	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $0.01 par value	259220	Direct
Common Stock $0.01 par value	28995021	Indirect
Common Stock $0.01 par value	17609635	Indirect
Common Stock $0.01 par value	54856	Indirect
Common Stock $0.01 par value	2686	Indirect

Footnotes

F1: Open market purchase by TIMET Finance Management Company. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing.

F2: The price reported in Column 4 is a weighted average price. These acquisitions involved 77 purchases at prices ranging from $53.20 to $54.17 per share. The reporting persons undertake to provide to the issuer, any security holder of the issuer or the U.S. Security and Exchange Commission, upon request, the full information regarding these purchases.

F3: Directly held by TIMET Finance Management Company. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing.

F4: The price reported in Column 4 is a weighted average price. These acquisitions involved 333 purchases at prices ranging from $54.25 to $55.24 per share. The reporting persons undertake to provide to the issuer, any security holder of the issuer or the U.S. Security and Exchange Commission, upon request, the full information regarding these purchases.

F5: The price reported in Column 4 is a weighted average price. These acquisitions involved 45 purchases at prices ranging from $55.26 to $55.49 per share. The reporting persons undertake to provide to the issuer, any security holder of the issuer or the U.S. Security and Exchange Commission, upon request, the full information regarding these purchases.

F6: Directly held by Valhi, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing.

F7: Directly held by NL Industries, Inc. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship among the persons joining in this filing.

F8: Directly held by the reporting person's wife. Mr. Simmons disclaims beneficial ownership of any shares of the issuer's common stock that his wife holds. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationships among the persons joining in this filing.

F9: Directly held by Contran Corporation. See the Additional Information filed as Exhibit 99 to this statement for a description of the relationship among the persons joining in this filing.