NL INDUSTRIES INC — Director's Dealing 2006

May 15, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: NL INDUSTRIES INC (NL)
CIK: 0000072162
Period of Report: 2006-05-11

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-11	Common stock $0.125 par value	P	1200	$14.19	Acquired	408400	Direct
2006-05-11	Common stock $0.125 par value	P	3800	$14.25	Acquired	412200	Direct
2006-05-12	Common stock $0.125 par value	P	10000	$13.25	Acquired	422200	Direct
2006-05-12	Common stock $0.125 par value	P	5000	$13.5	Acquired	427200	Direct
2006-05-15	Common stock $0.125 par value	P	100	$12.89	Acquired	427300	Direct
2006-05-15	Common stock $0.125 par value	P	4900	$13	Acquired	432200	Direct
2006-05-15	Common stock $0.125 par value	P	1900	$12.5	Acquired	434100	Direct
2006-05-15	Common stock $0.125 par value	P	10000	$12.6	Acquired	444100	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common stock $0.125 par value	40350931	Indirect
Common stock $0.125 par value	222100	Indirect
Common stock $0.125 par value	119475	Indirect

Footnotes

F1: Directly held by Valhi, Inc. See the Additional Information filed as an exhibit to this statement for a description of the
relationships among the persons joining in this filing.

F2: Directly held by TIMET Finance Management Company. See the Additional Information filed as an exhibit to this statement for
a description of the relationships among the persons joining in this filing.

F3: Directly held by the Reporting Person's spouse. The Reporting Person disclaims beneficial ownership of these shares.