NL INDUSTRIES INC — Director's Dealing 2004

Apr 2, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: KRONOS WORLDWIDE INC (KRO)
CIK: 0001257640
Period of Report: 2004-03-31

Reporting Person: CONTRAN CORP (10% Owner)
Reporting Person: VALHI INC /DE/ (10% Owner)
Reporting Person: NATIONAL CITY LINES INC (10% Owner)
Reporting Person: NL INDUSTRIES INC (10% Owner)
Reporting Person: DIXIE HOLDING CO (10% Owner)
Reporting Person: DIXIE RICE AGRICULTURE CORP INC (10% Owner)
Reporting Person: NOA INC (10% Owner)
Reporting Person: TREMONT LLC (10% Owner)
Reporting Person: SIMMONS HAROLD C (Director, Chairman of the Board and CEO, 10% Owner)
Reporting Person: SOUTHWEST LOUISIANA LAND CO INC (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-03-31	Common Stock $0.01 par value	J	100	$29.4	Acquired	16029246	Indirect
2004-03-31	Common Stock $0.01 par value	J	200	$29.5	Acquired	16029446	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock $0.01 par value	24702400	Indirect
Common Stock $0.01 par value	5180738	Indirect

Footnotes

F1: Open market purchase by Valhi, Inc. See the Additional Information filed as an exhibit to this statement for a description of the relationship among the persons joining in this filing.

F2: Directly held by Valhi, Inc. See the Additional Information filed as an exhibit to this statement for a description of the relationship among the persons joining in this filing.

F3: Directly held by NL Industries, Inc. See the Additional Information filed as an exhibit to this statement for a description of the relationship among the persons joining in this filing.

F4: Directly held by Tremont LLC. See the Additional Information filed as an exhibit to this statement for a description of the relationship among the persons joining in this filing.