NL Industries amends Code of Business Conduct and Ethics to add ESG section and update waivers

On February 23, 2023, the registrant’s board of directors adopted and approved certain amendments to the registrant’s Code of Business Conduct and Ethics, as reflected in an amended and restated version of the code of Business Conduct and Ethics (the “Code”). ​ The Code was revised and updated to add an introductory paragraph to the Principles section, to expand the former Sustainability section into an Environmental Social and Governance (ESG) section, to update the provisions regarding waivers, and to make other various wording changes.