NL Industries, Inc.

, and the exhibit in Item 9.01, is not deemed “filed” for purposes of section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the

Financial Statements and Exhibits. ​ ​ ​ ​ ​ (d) Exhibits ​ ​ ​ ​ ​ ​ ​ Item No. ​ Description ​ ​ ​ ​ ​ 99.1 ​ Press release dated October 30, 2025 issued by t