================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ---------- FORM 8-A/A AMENDMENT NO. 1 FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 APACHE CORPORATION (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER) ---------- DELAWARE 41-0747868 (STATE OF INCORPORATION OR ORGANIZATION) (I.R.S. EMPLOYER IDENTIFICATION NO.) 2000 POST OAK BOULEVARD SUITE 100 HOUSTON, TEXAS 77056 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES) (ZIP CODE) SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: TITLE OF EACH CLASS NAME OF EACH EXCHANGE ON WHICH TO BE SO REGISTERED EACH CLASS IS TO BE REGISTERED ------------------- ------------------------------ PREFERRED STOCK PURCHASE RIGHTS NEW YORK STOCK EXCHANGE CHICAGO STOCK EXCHANGE NASDAQ NATIONAL MARKET If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.[X] If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box.[ ] Securities Act registration statement file number to which this form relates: None. Securities to be registered pursuant to Section 12(g) of the Act: None. (Title of class) ================================================================================ ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED. Reference is hereby made to the Registration Statement on Form 8-A filed with the Securities and Exchange Commission on January 24, 1996 (the "Registration Statement") by Apache Corporation, a Delaware corporation (the "Company"), relating to the rights distributed to the stockholders of the Company (the "Rights") in connection with the Rights Agreement (the "Rights Agreement"), dated as of January 31, 1996, between the Company and Wells Fargo Bank, N.A. (formerly Norwest Bank Minnesota, N.A.), as Rights Agent (the "Rights Agent"). The Registration Statement is hereby amended by adding the following text after the last paragraph of the Registration Statement: The Company and the Rights Agent have entered into Amendment No. 1 to Rights Agreement, dated as of January 31, 2006 (the "First Amendment"). The First Amendment amends the Rights Agreement to: - change the "Final Expiration Date" to January 31, 2016; - reset the Rights trading with each share of the Common Stock to one Right per share (eliminating the cumulative effect of prior recapitalizations such as stock dividends on the Common Stock payable in shares of Common Stock or subdivisions, consolidations or combinations of the Common Stock); and - eliminate adjustments in the number of Rights per share for future stock dividends on the Common Stock payable in shares of Common Stock or subdivisions, consolidations or combinations of the Common Stock. The preceding summary of the principal terms of the First Amendment is a general description only and is subject to the detailed terms and conditions of the First Amendment, which is incorporated herein by reference to Exhibit 4.4 to this Registration Statement on Form 8-A/A. ITEM 2. EXHIBITS. EXHIBIT NUMBER DESCRIPTION OF EXHIBIT -------------- ---------------------- 4.1 Rights Agreement, dated as of January 31, 1996, between the Company and Norwest Bank Minnesota, N. A., Rights Agent (filed previously). 4.2 Specimen of the Right Certificate. A form of the Right Certificate is included as an attachment to Amendment No. 1 to Rights Agreement, dated as of January 31, 2006 (pages B-1 through B-6) and is incorporated herein by reference (included herewith in Exhibit 4.4). 4.3 Form of Letter to Shareholders, dated January 31, 1996, and attached Summary of Rights (filed previously). 4.4 Amendment No. 1 to Rights Agreement, dated as of January 31, 2006, by and between the Company and Wells Fargo Bank, N.A. (successor to Norwest Bank Minnesota, N.A.), as Rights Agent (filed herewith). SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized. APACHE CORPORATION By: /s/ Roger B. Plank ------------------------------------ Roger B. Plank Executive Vice President and Chief Financial Officer Date: January 31, 2006 INDEX OF EXHIBITS EXHIBIT NUMBER DESCRIPTION OF EXHIBIT -------------- ---------------------- 4.1 Rights Agreement, dated as of January 31, 1996, between the Company and Norwest Bank Minnesota, N. A., Rights Agent (filed previously). 4.2 Specimen of the Right Certificate. A form of the Right Certificate is included as an attachment to Amendment No. 1 to the Rights Agreement, dated as of January 31, 2006 (pages B-1 through B-6) and is incorporated herein by reference (included herewith in Exhibit 4.4). 4.3 Form of Letter to Shareholders, dated January 31, 1996, and attached Summary of Rights (filed previously). 4.4 Amendment No. 1 to Rights Agreement, dated as of January 31, 2006, by and between the Company and Wells Fargo Bank, N.A. (successor to Norwest Bank Minnesota, N.A.), as Rights Agent (filed herewith).