UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4)* Kerr-McGee Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 492386107 (CUSIP Number) Marc Weitzen, Esq. General Counsel Icahn Associates Corp. & affiliated companies 767 Fifth Avenue, 47th Floor New York, New York 10153 (212) 702-4388 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) April 13, 2005 (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of " 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box / /. NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON High River Limited Partnership S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 1,648,820 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 1,648,820 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,648,820 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.01% 14 TYPE OF REPORTING PERSON* PN SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Hopper Investments LLC S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 1,648,820 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 1,648,820 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,648,820 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.01% 14 TYPE OF REPORTING PERSON* OO SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Barberry Corp. S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 1,648,820 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 1,648,820 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,648,820 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.01% 14 TYPE OF REPORTING PERSON* CO SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Icahn Partners Master Fund L.P. S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 3,365,557 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 3,365,557 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,365,557 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.06% 14 TYPE OF REPORTING PERSON* PN SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Icahn Offshore L.P. S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 3,365,557 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 3,365,557 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,365,557 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.06% 14 TYPE OF REPORTING PERSON* PN SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON CCI Offshore LLC S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 3,365,557 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 3,365,557 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,365,557 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.06% 14 TYPE OF REPORTING PERSON* OO SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Icahn Partners L.P. S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 3,229,723 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 3,229,723 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,229,723 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.98% 14 TYPE OF REPORTING PERSON* PN SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Icahn Onshore L.P. S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 3,229,723 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 3,229,723 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,229,723 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.98% 14 TYPE OF REPORTING PERSON* PN SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON CCI Onshore LLC S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 3,229,723 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 3,229,723 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,229,723 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.98% 14 TYPE OF REPORTING PERSON* OO SCHEDULE 13D CUSIP No. 492386107 1 NAME OF REPORTING PERSON Carl C. Icahn S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) / / (b) /X/ 3 SEC USE ONLY 4 SOURCE OF FUNDS* OO 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) /X/ 6 CITIZENSHIP OR PLACE OF ORGANIZATION United States of America NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 0 8 SHARED VOTING POWER 8,244,100 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 8,244,100 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,244,100 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* /X/ 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.04% 14 TYPE OF REPORTING PERSON* IN SCHEDULE 13D Item 1. Security and Issuer The Schedule 13D filed on March 3, 2005 by the Reporting Persons (as defined herein), relating to the common stock, $1.00 par value (the "Shares"), of Kerr-McGee Corporation, a Delaware corporation (the "Issuer"), as amended by Amendment No. 1 filed on March 11, 2005, Amendment No. 2 filed on March 24, 2005 and Amendment No. 3 filed on April 4, 2005, is hereby further amended as set forth below by this Amendment No. 4 to Schedule 13D. The address of the principal executive offices of the Issuer is Kerr-McGee Center, 123 Robert S. Kerr Avenue, Oklahoma City, OK 73102. Item 3. Source and Amount of Funds or Other Consideration Item 3 is hereby amended and restated to read, in its entirety, as follows: The aggregate purchase price of the 8,244,100 Shares purchased by High River, Icahn Master and Icahn Partners, collectively, was $597,122,098.70 (including commissions and, with respect to Shares acquired upon exercise of options, including option purchase prices). The source of funding for the purchase of these Shares was the respective general working capital of the purchasers, and, with respect to High River, pursuant to margin accounts in the regular course of business. Item 4. Purpose of Transaction Item 4 is hereby amended to add the following: On April 13, 2005, the Reporting Persons, the JANA Parties and the Issuer entered into an agreement (the "Agreement"). A copy of the Agreement is filed herewith as an exhibit and incorporated herein by reference. On April 14, 2005, the Reporting Persons and the JANA Parties issued a press release (the "Press Release"). A copy of the Press Release is filed herewith as an exhibit and incorporated herein by reference. CARL C. ICAHN, BARRY S. ROSENSTEIN AND CERTAIN RELATED PARTIES FILED A PRELIMINARY PROXY STATEMENT WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 8, 2005 RELATING TO THEIR SOLICITATION OF PROXIES FROM THE STOCKHOLDERS OF KERR-MCGEE CORPORATION WITH RESPECT TO THE 2005 ANNUAL MEETING OF KERR-MCGEE'S STOCKHOLDERS. THE PRELIMINARY PROXY STATEMENT CONTAINS DETAILED INFORMATION REGARDING THE NAMES, AFFILIATIONS AND INTERESTS OF PERSONS WHO MAY BE DEEMED PARTICIPANTS IN THE SOLICITATION OF PROXIES OF KERR-MCGEE'S STOCKHOLDERS. THESE PARTIES INTEND TO FILE A DEFINITIVE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS WITH THE SECURITIES AND EXCHANGE COMMISSION. SECURITY HOLDERS ARE ADVISED TO READ THE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. THE PROXY STATEMENT AND OTHER RELEVANT DOCUMENTS MAY BE OBTAINED WITHOUT CHARGE FROM THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV, AND THE DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE MAILED TO STOCKHOLDERS OF KERR-MCGEE CORPORATION. Item 5. Interest in Securities of the Issuer Item 5 is hereby supplemented as follows: (a) The Reporting Persons may be deemed to beneficially own, in the aggregate, 8,244,100 Shares, representing approximately 5.04% of the Issuer's outstanding Shares (based upon the 163,442,818 Shares stated to be outstanding as of March 11, 2005 by the Issuer in the Issuer's definitive proxy statement on Schedule 14A, filed with the Securities and Exchange Commission on April 1, 2005). (b) High River has sole voting power and sole dispositive power with regard to 1,648,820 Shares. Each of Barberry, Hopper and Carl C. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master has sole voting power and sole dispositive power with regard to 3,365,557 Shares. Each of Icahn Offshore, CCI Offshore and Carl C. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Partners has sole voting power and sole dispositive power with regard to 3,229,723 Shares. Each of Icahn Onshore, CCI Onshore and Carl C. Icahn has shared voting power and shared dispositive power with regard to such Shares. The Reporting Persons may be deemed to be members of a "group" with the JANA Parties within the meaning of Section 13(d)(3) of the Act. As such, the group may be deemed to beneficially own Shares owned by the Reporting Persons and the JANA Parties. Upon information and belief, the JANA Parties, as of the close of business on April 13, 2005, may be deemed to beneficially own 4,388,700 Shares in the aggregate. Accordingly, the 12,632,800 Shares that may be deemed to be beneficially owned in the aggregate by the group constitutes approximately 7.7% of the Shares outstanding. However, neither the fact of this filing nor anything contained herein shall be deemed to be an admission by any of the Reporting Persons that they are the beneficial owners of Shares owned by the JANA Parties. (c) The following table sets forth all transactions with respect to Shares effected since the most recent filing on Schedule 13D by the Reporting Persons. All such transactions were effected in the open market and the table includes commissions paid in per share prices. No. of Shares Price Name Date Purchased Per Share -------------------------------------------------------------------------------- High River 04/06/05 12,000 75.2439 Icahn Master 04/06/05 24,480 75.2439 Icahn Partners 04/06/05 23,520 75.2439 -------------------------------------------------------------------------------- Item 6. Contracts, Arrangements, Understandings or Relationship with Respect to Securities of the Issuer Item 6 is hereby amended to add the following: On April 13, 2005, the Reporting Persons, the JANA Parties and the Issuer entered into the Agreement. A copy of the Agreement is filed herewith as an exhibit and incorporated herein by reference. On April 14, 2005, the Reporting Persons and the JANA Parties issued the Press Release. A copy of the Press Release is filed herewith as an exhibit and incorporated herein by reference. Item 7. Material to be Filed as Exhibits Item 7 is hereby amended and restated to read, in its entirety, as follows: 1 Agreement among the Reporting Persons, the JANA Parties and the Issuer. 2 Press Release issued by the Reporting Persons and the JANA Parties. SIGNATURE After reasonable inquiry and to the best of each of the undersigned knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct. Dated: April 14, 2005 HOPPER INVESTMENTS LLC By: Barberry Corp. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory BARBERRY CORP. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory HIGH RIVER LIMITED PARTNERSHIP By: Hopper Investments LLC, General Partner By: Barberry Corp., member By: /S/ EDWARD E. MATTNER --------------------------- Name: Edward E. Mattner Title: Authorized Signatory ICAHN PARTNERS MASTER FUND L.P. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory [Signature Page of Amendment #4 to Schedule 13D - Kerr-McGee, Inc.] ICAHN OFFSHORE L.P. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory CCI OFFSHORE LLC By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory ICAHN PARTNERS L.P. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory ICAHN ONSHORE L.P. By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory CCI ONSHORE LLC By: /S/ EDWARD E. MATTNER ----------------------- Name: Edward E. Mattner Title: Authorized Signatory /S/ CARL C. ICAHN ----------------------- CARL C. ICAHN [Signature Page of Amendment #4 to Schedule 13D - Kerr-McGee, Inc.]