UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)

September 15, 2025

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.)


5430 LBJ Freeway, Suite 1700, Dallas, Texas		75240-2620
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code

(972) 233-1700



	(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2):


☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common stock

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 1.01

Entry into a Material Definitive Agreement.

Item 2.03

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information disclosed by Kronos Worldwide, Inc., a Delaware corporation and an affiliate of the registrant (“Kronos Worldwide”), under Items 1.01 and 2.03 of the Current Report on Form 8-K dated September 15, 2025 that Kronos Worldwide (File No. 1-31763) filed with the U.S. Securities and Exchange Commission on September 15, 2025 is hereby incorporated herein by reference.

Item 9.01

Financial Statements and Exhibits.

1
(d)	Exhibits

	Item No.	Description

	10.1	Third Supplemental Indenture dated as of September 15, 2025, by and among Kronos International, Inc., the guarantors named therein, and Deutsche Bank Trust Company Americas, as trustee, collateral agent, paying agent, transfer agent and registrar – incorporated by reference to Exhibit 10.1 to Kronos Worldwide, Inc.’s Current Report on Form 8-K filed September 15, 2025

	10.2	Additional Notes Priority Joinder Agreement dated September 15, 2025, executed by Deutsche Bank Trust Company Americas, as trustee and collateral agent – incorporated by reference to Exhibit 10.2 to Kronos Worldwide, Inc.’s Current Report on Form 8-K filed September 15, 2025

	104	Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURE

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.


	NL INDUSTRIES, INC.
	(Registrant)



Date: September 15, 2025	By: /s/Amy A. Samford
	Amy A. Samford Executive Vice President and Chief Financial Officer

NL INDUSTRIES INC 8-K