EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

Name of Corporation	Jurisdiction ofIncorporationor Organization	% of VotingSecuritiesHeld atDecember 31,2022 (1)
ASC Holdings, Inc.	Utah		100	%
Kronos Worldwide, Inc. (2)	Delaware		50	%
NL Industries, Inc. (2), (3), (4)	New Jersey		83	%
CompX International Inc. (4)	Delaware		87	%
Tremont LLC	Delaware		100	%
TRECO LLC	Nevada		100	%
Basic Management, Inc.	Nevada		63	%
Basic Water Company (5)	Nevada		100	%
Basic Water Company SPE LLC (5)	Nevada		100	%
Basic Environmental Company LLC	Nevada		100	%
Basic Power Company	Nevada		100	%
Basic Remediation Company LLC	Nevada		100	%
Basic Land Company	Nevada		100	%
The LandWell Company LP (6)	Delaware		50	%
Henderson Interchange Sign LLC	Nevada		100	%
TRE Management Company	Delaware		100	%
Tall Pines Insurance Company	Vermont		100	%
Medite Corporation	Delaware		100	%

(1) Held by the Registrant or the indicated subsidiary of the Registrant.

(2) Subsidiaries of Kronos are incorporated by reference to Exhibit 21.1 of Kronos’ Annual Report on Form 10-K for the year ended December 31, 2022 (File No. 333-100047). NL owns an additional 30% of Kronos directly.

(3) Subsidiaries of NL are incorporated by reference to Exhibit 21.1 of NL’s Annual Report on Form 10-K for the year ended December 31, 2022 (File No. 1-640).

(4) Subsidiaries of CompX are incorporated by reference to Exhibit 21.1 of CompX’s Annual Report on Form 10-K for the year ended December 31, 2022 (File No. 1-13905).

(5) Basic Water Company and its subsidiaries voluntarily filed for Chapter 11 bankruptcy in the United States Bankruptcy Court for the District of Nevada on September 10, 2022.

(6) TRECO LLC owns an additional 27% of The LandWell Company LP directly.