EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

Name of Corporation	Jurisdiction of Incorporation or Organization

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 Environmental Company LLC	Nevada	100	%
Basic Remediation Company LLC	Nevada	100	%
Basic Land Company	Nevada	100	%
The LandWell Company LP (5)	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, 2025 (File No. 333-100047). NL owns an additional 31% 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, 2025 (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, 2025 (File No. 1-13905).

(5)

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