UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended June 30, 2019 Commission file number 1-640 NL INDUSTRIES, INC. (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) New Jersey 13-5267260 (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of principal executi ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended March 31, 2019 Commission file number 1-640 NL INDUSTRIES, INC. (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) New Jersey 13-5267260 (IRS Employer Identification No.) 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2620 (Address of principal execut ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934: For the fiscal year ended December 31, 2018 Commission file number 1-640 NL INDUSTRIES, INC. (Exact name of Registrant as specified in its charter) New Jersey 13-5267260 (State or other jurisdiction of incorporation or organization) Securities registered pursuant to Section 12(b) of the Act: | Title of each class | Name of each exchange on ...