NL Industries Inc.

05/19/2026 | Press release | Distributed by Public on 05/19/2026 14:17

Specialized Disclosure Report (Form SD)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

Specialized Disclosure Report

NL Industries, Inc.

(Exact name of registrant as specified in its charter)

New Jersey

1-640

13-5267260

(State or other jurisdiction of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

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5430 LBJ Freeway, Suite 1700, Dallas, Texas

75240-2620

(Address of principal executive offices)

(Zip Code)

Jane R. Grimm

Secretary

NL Industries, Inc.

Three Lincoln Centre

5430 LBJ Freeway, Suite 1700

Dallas, Texas 75240-2620

(972) 233-1700

(Name and telephone number, including area code, of the person to contact in connection with this report.)

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Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

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Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2025.

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Section 1 - Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

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The registrant incorporates herein by reference the Conflict Minerals Disclosure for the 2025 calendar year contained in the Form SD filed on May 19, 2026 by the registrant's subsidiary, CompX International Inc. (Securities and Exchange Act file no. 1-13905), with the U.S. Securities and Exchange Commission. Such Conflict Minerals Disclosure is posted on the subsidiary's website at:

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https://compxinternational.com/governance/#conflict

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This Conflicts Minerals Disclosure is also posted on the registrant's website at:

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https://nl-ind.com/

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SIGNATURE

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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NL Industries, Inc.

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(Registrant)

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By:/s/ Amy A. Samford​ ​

Date: May 19, 2026

Amy A. Samford

Executive Vice President and Chief Financial Officer

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NL Industries Inc. published this content on May 19, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on May 19, 2026 at 20:17 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]