As filed with the Securities and Exchange Commission on October 19, 2006 Registration No. 033-25913 ================================================================================ SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 -------------------- POST-EFFECTIVE AMENDMENT TO FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 -------------------- NL INDUSTRIES, INC. (Exact name of registrant as specified in its charter) New Jersey 13-5267260 (State or other jurisdiction (I.R.S. Employer of incorporation or Identification No.) organization) Three Lincoln Centre 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2697 (Address of principal (Zip Code) executive offices) -------------------- NL INDUSTRIES, INC. RETIREMENT SAVINGS PLAN (Full title of the plan) -------------------- A. Andrew R. Louis, Esq. Three Lincoln Centre 5430 LBJ Freeway, Suite 1700 Dallas, Texas 75240-2697 (972) 233-1700 (Name, address and telephone number including area code of agent for service) ================================================================================ DEREGISTRATION Pursuant to Item 512(a)(3), this Post-Effective Amendment is filed in order to deregister securities remaining unsold under Registration Statement No. 33-25913 filed with the U.S. Securities and Exchange Commission. On December 31, 2005 the NL Industries, Inc. Retirement Savings Plan, formerly known as the Savings Plan for Employees of NL Industries, Inc. that was adopted by the registrant's board of directors on February 14, 1989 effective January 1, 1989 and approved by the registrant's shareholders on May 2, 1989(the "Plan"), merged into another retirement plan, with the other plan surviving the merger. The surviving plan no longer offered to participants the option to purchase or sell shares of the registrant's common stock, par value $0.125 per share, of the registrant. Any shares of the registrant's common stock held by a participant of the plan were sold prior to December 31, 2005. Accordingly, the registrant hereby deregisters all participation interests of the Plan and any and all shares of the registrant's common stock registered pursuant to this registration statement remaining unsold at the effective time of the merger. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all the requirements for filing on Form S-8 and has duly caused this Post-Effective Amendment to the Registration Statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Dallas, Texas on October 19, 2006. NL INDUSTRIES, INC. By: /s/ Gregory M. Swalwell --------------------------- Gregory M. Swalwell Vice President, Finance and Chief Financial Officer Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed by the following persons in the capacities and on the dates indicated: Signature Title Date ---------------------- ----------------- ---------------- /s/ Harold C. Simmons Chairman of the Board and Chief October 19, 2006 --------------------- Executive Officer (Principal Harold C. Simmons Executive Officer) /s/ Gregory M. Swalwell Vice President, Finance and October 19, 2006 --------------------- Chief Financial Officer Gregory M. Swalwell (Principal Financial Officer) /s/ Tim C. Hafer Vice President and Controller October 19, 2006 --------------------- (Principal Accounting Officer) Tim C. Hafer /s/ Glenn R. Simmons Director October 19, 2006 ---------------------- Glenn R. Simmons /s/ Cecil H. Moore, Jr. Director October 19, 2006 ---------------------- Cecil H. Moore, Jr. /s/ Thomas P. Stafford Director October 19, 2006 ---------------------- Thomas P. Stafford /s/ Steven L. Watson Director October 19, 2006 ---------------------- Steven L. Watson /s/ Terry N. Worrell Director October 19, 2006 ---------------------- Terry N. Worrell Pursuant to the requirements of the Securities Act of 1933, the NL Industries, Inc. Retirement Savings Plan has duly caused this Post-Effective Amendment to the Registration Statement on Form S-8 to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Dallas, Texas on October 19, 2006. NL Industries, Inc. Retirement Savings Plan By: NL Industries, Inc., as sponsor of NL Industries, Inc. Retirement Savings Plan By: /s/ Gregory M. Swalwell ----------------------- Gregory M. Swalwell Vice President, Finance and Chief Financial Officer