SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No.__)* Chesapeake Energy Corporation (Name of Issuer) Common Stock, Par Value $0.01 (Title of Class of Securities) 165167107 (CUSIP Number) Marc Weitzen, Esq. Icahn Capital LP 767 Fifth Avenue, 47th Floor New York, New York 10153 (212) 702-4300 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) December 7, 2010 (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 Section 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. 165167107 1 NAME OF REPORTING PERSON High River Limited Partnership 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 7,725,884 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 7,725,884 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,725,884 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.16% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Hopper Investments LLC 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 7,725,884 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 7,725,884 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,725,884 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.16% 14 TYPE OF REPORTING PERSON OO SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Barberry Corp. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 7,725,884 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 7,725,884 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,725,884 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.16% 14 TYPE OF REPORTING PERSON CO SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Partners Master Fund LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 13,256,264 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 13,256,264 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,256,264 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.99% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Partners Master Fund II LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 4,137,941 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 4,137,941 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,137,941 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.62% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Partners Master Fund III LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 1,839,369 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 1,839,369 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,839,369 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.28% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Offshore LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 19,233,574 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 19,233,574 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 19,233,574 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.89% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Partners LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 3 SEC USE ONLY 4 SOURCE OF FUNDS WC 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / / 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH: 7 SOLE VOTING POWER 11,669,959 8 SHARED VOTING POWER 0 9 SOLE DISPOSITIVE POWER 11,669,959 10 SHARED DISPOSITIVE POWER 0 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,669,959 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.75% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Onshore LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 11,669,959 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 11,669,959 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,669,959 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.75% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Capital LP 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 30,903,533 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 30,903,533 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 30,903,533 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.64% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON IPH GP LLC 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 30,903,533 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 30,903,533 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 30,903,533 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.64% 14 TYPE OF REPORTING PERSON OO SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Enterprises Holdings L.P. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 30,903,533 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 30,903,533 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 30,903,533 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.64% 14 TYPE OF REPORTING PERSON PN SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Icahn Enterprises G.P. Inc. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 30,903,533 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 30,903,533 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 30,903,533 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.64% 14 TYPE OF REPORTING PERSON CO SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Beckton Corp. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 30,903,533 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 30,903,533 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 30,903,533 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.64% 14 TYPE OF REPORTING PERSON CO SCHEDULE 13D CUSIP No. 165167107 1 NAME OF REPORTING PERSON Carl C. Icahn 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / / 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) / / 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 38,629,417 9 SOLE DISPOSITIVE POWER 0 10 SHARED DISPOSITIVE POWER 38,629,417 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 38,629,417 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / / 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.80% 14 TYPE OF REPORTING PERSON IN SCHEDULE 13D Item 1. Security and Issuer This statement relates to the Common Stock, par value $0.01 (the "Shares"), issued by Chesapeake Energy Corporation (the "Issuer"). The address of the principal executive offices of the Issuer is 6100 North Western Avenue, Oklahoma City, Oklahoma 73118. Item 2. Identity and Background The persons filing this statement are High River Limited Partnership ("High River"), Hopper Investments LLC ("Hopper"), Barberry Corp. ("Barberry"), Icahn Partners Master Fund LP ("Icahn Master"), Icahn Partners Master Fund II LP ("Icahn Master II"), Icahn Partners Master Fund III LP ("Icahn Master III"), Icahn Offshore LP ("Icahn Offshore"), Icahn Partners LP ("Icahn Partners"), Icahn Onshore LP ("Icahn Onshore"), Icahn Capital LP ("Icahn Capital"), IPH GP LLC ("IPH"), Icahn Enterprises Holdings L.P. ("Icahn Enterprises Holdings"), Icahn Enterprises G.P. Inc. ("Icahn Enterprises GP"), Beckton Corp. ("Beckton"), and Carl C. Icahn, a citizen of the United States of America (collectively, the "Reporting Persons"). The principal business address of each of (i) High River, Hopper, Barberry, Icahn Offshore, Icahn Partners, Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP and Beckton is White Plains Plaza, 445 Hamilton Avenue - Suite 1210, White Plains, NY 10601, (ii) Icahn Master, Icahn Master II and Icahn Master III is c/o Walkers SPV Limited, P.O. Box 908GT, 87 Mary Street, George Town, Grand Cayman, Cayman Islands, and (iii) Mr. Icahn is c/o Icahn Associates Corp., 767 Fifth Avenue, 47th Floor, New York, NY 10153. Barberry is the sole member of Hopper, which is the general partner of High River. Icahn Offshore is the general partner of each of Icahn Master, Icahn Master II and Icahn Master III. Icahn Onshore is the general partner of Icahn Partners. Icahn Capital is the general partner of each of Icahn Offshore and Icahn Onshore. Icahn Enterprises Holdings is the sole member of IPH, which is the general partner of Icahn Capital. Beckton is the sole stockholder of Icahn Enterprises GP, which is the general partner of Icahn Enterprises Holdings. Carl C. Icahn is the sole stockholder of each of Barberry and Beckton. As such, Mr. Icahn is in a position indirectly to determine the investment and voting decisions made by each of the Reporting Persons. In addition, Mr. Icahn is the indirect holder of approximately 92.6% of the outstanding depositary units representing limited partnership interests in Icahn Enterprises L.P. ("Icahn Enterprises"). Icahn Enterprises GP is the general partner of Icahn Enterprises, which is the sole limited partner of Icahn Enterprises Holdings. Each of High River and Barberry is primarily engaged in the business of investing in securities. Hopper is primarily engaged in the business of serving as the general partner of High River. Each of Icahn Master, Icahn Master II, Icahn Master III and Icahn Partners is primarily engaged in the business of investing in securities. Icahn Offshore is primarily engaged in the business of serving as the general partner of each of Icahn Master, Icahn Master II and Icahn Master III. Icahn Onshore is primarily engaged in the business of serving as the general partner of Icahn Partners. Icahn Capital is primarily engaged in the business of serving as the general partner of each of Icahn Offshore and Icahn Onshore. IPH is primarily engaged in the business of serving as the general partner of Icahn Capital. Icahn Enterprises Holdings is primarily engaged in the business of holding direct or indirect interests in various operating businesses. Icahn Enterprises GP is primarily engaged in the business of serving as the general partner of each of Icahn Enterprises and Icahn Enterprises Holdings. Beckton is primarily engaged in the business of holding the capital stock of Icahn Enterprises GP. Carl C. Icahn's present principal occupation or employment is serving as (i) Chief Executive Officer of Icahn Capital LP, a wholly owned subsidiary of Icahn Enterprises, through which Mr. Icahn manages various private investment funds, including Icahn Partners, Icahn Master, Icahn Master II and Icahn Master III, (ii) Chairman of the Board of Icahn Enterprises GP, the general partner of Icahn Enterprises, a New York Stock Exchange listed diversified holding company engaged in a variety of businesses, including investment management, metals, automotive, real estate, railcar, food packaging, casino gambling and home fashion, and (iii) Chairman of the Board and a director of Starfire Holding Corporation ("Starfire"), a holding company engaged in the business of investing in and/or holding securities of various entities, and as Chairman of the Board and a director of various of Starfire's subsidiaries. The name, citizenship, present principal occupation or employment and business address of each director and executive officer of the Reporting Persons are set forth in Schedule A attached hereto. None of the Reporting Persons nor any manager or executive officer of the Reporting Persons, has, during the past five years, (a) been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors), or (b) been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting, or mandating activities subject to, Federal or State securities laws or a finding of any violation with respect to such laws. Item 3. Source and Amount of Funds or Other Consideration The Reporting Persons hold, in the aggregate, 38,629,417 Shares. The aggregate purchase price of the Shares purchased by the Reporting Persons collectively was approximately $945.9 million (including commissions and premiums for the options to purchase Shares). The source of funding for the purchase of these Shares was the general working capital of the respective purchasers. The Shares are held by the Reporting Persons in margin accounts together with other securities. Such margin accounts may from time to time have debit balances. Part of the purchase price of the Shares purchased by the Reporting Persons was obtained through margin borrowing. As of the close of business on December 16, 2010, the indebtedness of (i) High River's margin account was approximately $759.6 million, (ii) Icahn Partners' margin account was approximately $456.9 million, (iii) Icahn Master's margin account was approximately $553.1 million, (iv) Icahn Master II's margin account was approximately $281.3 million, and (v) Icahn Master III's margin account was approximately $68.5 million. Item 4. Purpose of Transaction The Reporting Persons acquired the Shares in the belief that the Shares were undervalued. The Reporting Persons have had and intend to seek to continue to have conversations with the Issuer's management to discuss the business and operations of the Issuer and the maximization of shareholder value. The Reporting Persons may, from time to time and at any time, acquire additional Shares and/or other equity, debt, notes, instruments or other securities of the Issuer, or related to the securities of the Issuer (collectively, "Securities"), in the open market or otherwise. They reserve the right to dispose of any or all of their Securities in the open market or otherwise, at any time and from time to time, and to engage in any hedging or similar transactions with respect to the Securities. Item 5. Interest in Securities of the Issuer (a) The Reporting Persons may be deemed to beneficially own, in the aggregate, 38,629,417 Shares, representing approximately 5.80% of the Issuer's outstanding Shares based upon (i) the 653,915,007 Shares stated to be outstanding as of November 3, 2010 by the Issuer in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 9, 2010, (ii) the 26,100,784 Shares beneficially held by the Filing Persons, and (iii) the 12,528,633 Shares issuable upon conversion of the 350,000 shares of 5 3/4% Cumulative Non-Voting Convertible Preferred Stock (Series A) (the "Series A Shares") beneficially held by the Filing Persons. (b) High River has sole voting power and sole dispositive power with regard to 5,220,157 Shares (which includes 2,505,727 Series A Shares). Each of Hopper, Barberry and Mr. 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 9,027,385 Shares (which includes 4,228,879 Series A Shares). Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master II has sole voting power and sole dispositive power with regard to 2,611,560 Shares (which includes 1,526,381 Series A Shares). Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master III has sole voting power and sole dispositive power with regard to 1,271,393 Shares (which includes 567,976 Series A Shares). Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. 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 7,970,289 Shares (which includes 3,699,670 Series A Shares). Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Each of Hopper, Barberry and Mr. Icahn, by virtue of their relationships to High River (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which High River directly beneficially owns. Each of Hopper, Barberry and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to each of Icahn Master, Icahn Master II and Icahn Master III (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which each of Icahn Master, Icahn Master II and Icahn Master III directly beneficially owns. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Partners (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which Icahn Partners directly beneficially owns. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes. (c) The following table sets forth all transactions with respect to Shares effected during the past sixty (60) days by any of the Reporting Persons, inclusive of any transactions effected through 5:00 p.m., New York City time, on December 17, 2010. Except as otherwise noted below, all such transactions were purchases of Shares effected in the open market, and the table includes commissions paid in per share prices. Name of Date No. of Purchase Price Reporting of Shares Per Share Person Transaction Purchased (U.S.$) --------- ----------- --------- -------------- High River 12/07/2010 280,898 22.72 High River 12/08/2010 94,056 22.75 High River 12/09/2010 105,320 22.75 High River 12/10/2010 160,104 22.87 High River 12/13/2010 297,136 22.89 High River 12/14/2010 121,885 22.88 Icahn Partners 12/07/2010 447,464 22.72 Icahn Partners 12/08/2010 143,609 22.75 Icahn Partners 12/09/2010 160,805 22.75 Icahn Partners 12/10/2010 244,451 22.87 Icahn Partners 12/13/2010 453,677 22.89 Icahn Partners 12/14/2010 186,096 22.88 Icahn Master 12/07/2010 494,527 22.72 Icahn Master 12/08/2010 162,655 22.75 Icahn Master 12/09/2010 182,134 22.75 Icahn Master 12/10/2010 276,875 22.87 Icahn Master 12/13/2010 513,845 22.89 Icahn Master 12/14/2010 210,780 22.88 Icahn Master II 12/07/2010 114,703 22.72 Icahn Master II 12/08/2010 47,056 22.75 Icahn Master II 12/09/2010 52,689 22.75 Icahn Master II 12/10/2010 80,097 22.87 Icahn Master II 12/13/2010 148,653 22.89 Icahn Master II 12/14/2010 60,977 22.88 Icahn Master III 12/07/2010 66,898 22.72 Icahn Master III 12/08/2010 22,906 22.75 Icahn Master III 12/09/2010 25,652 22.75 Icahn Master III 12/10/2010 38,994 22.87 Icahn Master III 12/13/2010 72,368 22.89 Icahn Master III 12/14/2010 29,686 22.88 Item 6. Contracts, Arrangements, Understandings or Relationship with Respect to Securities of the Issuer Except as otherwise described herein, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any person with respect to any securities of the Issuer, including but not limited to transfer or voting of any of the securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies. Item 7. Material to be Filed as Exhibits 1 Joint Filing Agreement of the Reporting Persons. 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: December 17, 2010 ICAHN PARTNERS MASTER FUND LP ICAHN PARTNERS MASTER FUND II LP ICAHN PARTNERS MASTER FUND III LP ICAHN OFFSHORE LP ICAHN PARTNERS LP ICAHN ONSHORE LP BECKTON CORP. HOPPER INVESTMENTS LLC BARBERRY CORP. HIGH RIVER LIMITED PARTNERSHIP By: Hopper Investments LLC, general partner By: /s/ Edward E. Mattner ------------------------ Name: Edward E. Mattner Title: Authorized Signatory ICAHN CAPITAL LP IPH GP LLC ICAHN ENTERPRISES HOLDINGS L.P. By: Icahn Enterprises G.P. Inc., its general partner ICAHN ENTERPRISES G.P. INC. By: /s/ Daniel A. Ninivaggi ------------------------- Name: Daniel A. Ninivaggi Title: President /s/ Carl C. Icahn -------------------- CARL C. ICAHN [Signature Page of Schedule 13D - Chesapeake Energy Corporation] EXHIBIT 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the Common Stock of Chesapeake Energy Corporation and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, have executed this Joint Filing Agreement this 17th day of December, 2010. ICAHN PARTNERS MASTER FUND LP ICAHN PARTNERS MASTER FUND II LP ICAHN PARTNERS MASTER FUND III LP ICAHN OFFSHORE LP ICAHN PARTNERS LP ICAHN ONSHORE LP BECKTON CORP. HOPPER INVESTMENTS LLC BARBERRY CORP. HIGH RIVER LIMITED PARTNERSHIP By: Hopper Investments LLC, general partner By: /s/ Edward E. Mattner ------------------------ Name: Edward E. Mattner Title: Authorized Signatory ICAHN CAPITAL LP IPH GP LLC ICAHN ENTERPRISES HOLDINGS L.P. By: Icahn Enterprises G.P. Inc., its general partner ICAHN ENTERPRISES G.P. INC. By: /s/ Daniel A. Ninivaggi ------------------------- Name: Daniel A. Ninivaggi Title: President /s/ Carl C. Icahn -------------------- CARL C. ICAHN [Signature Page of Joint Filing Agreement to Schedule 13D - Chesapeake Energy Corporation] SCHEDULE A DIRECTORS AND EXECUTIVE OFFICERS OF THE REPORTING PERSONS The following sets forth the name, position, and principal occupation of each director and executive officer of each of the Reporting Persons. Each such person is a citizen of the United States of America. Except as otherwise indicated, the business address of each director and officer is c/o Icahn Associates Corp., 767 Fifth Avenue, 47th Floor, New York, New York 10153. To the best of the Reporting Persons' knowledge, except as set forth in this statement on Schedule 13D, none of the directors or executive officers of the Reporting Persons own any Shares. ICAHN PARTNERS MASTER FUND LP ICAHN PARTNERS MASTER FUND II LP ICAHN PARTNERS MASTER FUND III LP Name Position ---- -------- Icahn Offshore LP Managing General Partner Carl C. Icahn Chief Executive Officer; Authorized Signatory Vincent J. Intrieri Senior Managing Director; Authorized Signatory Irene March Chief Financial Officer; Authorized Signatory Edward E. Mattner Authorized Signatory Gail Golden Authorized Signatory Dana Witkin Director of Investor Relations Keith Cozza Chief Compliance Officer Anthony Canova Controller ICAHN PARTNERS LP Name Position ---- -------- Icahn Onshore LP General Partner Carl C. Icahn Chief Executive Officer; Authorized Signatory Vincent J. Intrieri Senior Managing Director; Authorized Signatory Irene March Chief Financial Officer; Authorized Signatory Edward E. Mattner Authorized Signatory Gail Golden Authorized Signatory Dana Witkin Director of Investor Relations Keith Cozza Chief Compliance Officer Anthony Canova Controller ICAHN ONSHORE LP ICAHN OFFSHORE LP Name Position ---- -------- Icahn Capital LP General Partner Carl C. Icahn Chief Executive Officer; Authorized Signatory Vincent J. Intrieri Senior Managing Director; Authorized Signatory Irene March Chief Financial Officer; Authorized Signatory Edward E. Mattner Authorized Signatory Gail Golden Authorized Signatory Dana Witkin Director of Investor Relations Keith Cozza Chief Compliance Officer Anthony Canova Controller ICAHN CAPITAL LP Name Position ---- -------- IPH GP LLC General Partner Carl C. Icahn Chief Executive Officer; Authorized Signatory Vincent J. Intrieri Senior Managing Director; Authorized Signatory Daniel A. Ninivaggi President; Authorized Signatory Dominick Ragone Chief Financial Officer; Authorized Signatory Edward E. Mattner Authorized Signatory Gail Golden Authorized Signatory Keith Cozza Chief Compliance Officer IPH GP LLC Name Position ---- -------- Icahn Enterprises Holdings L.P. Sole Member Carl C. Icahn Chief Executive Officer; Authorized Signatory Vincent J. Intrieri Senior Managing Director; Authorized Signatory Daniel A. Ninivaggi President; Authorized Signatory Dominick Ragone Chief Financial Officer; Authorized Signatory Edward E. Mattner Authorized Signatory Gail Golden Authorized Signatory Keith Cozza Chief Compliance Officer ICAHN ENTERPRISES HOLDINGS L.P. Name Position ---- -------- Icahn Enterprises G.P. Inc. General Partner ICAHN ENTERPRISES G.P. INC. Name Position ---- -------- Carl C. Icahn Chairman Daniel A. Ninivaggi President William A. Leidesdorf Director Jack G. Wasserman Director James L. Nelson Director Vincent J. Intrieri Director; Authorized Signatory Dominick Ragone Chief Financial Officer; Chief Accounting Officer; Secretary Felicia P. Buebel Assistant Secretary Craig Pettit Vice President/Taxes BECKTON CORP. Name Position ---- -------- Carl C. Icahn Chairman of the Board; President Jordan Bleznick Vice President/Taxes Edward E. Mattner Authorized Signatory Keith Cozza Secretary; Treasurer HIGH RIVER LIMITED PARTNERSHIP Name Position ---- -------- Hopper Investments LLC General Partner HOPPER INVESTMENTS LLC Name Position ---- -------- Barberry Corp. Member Edward E. Mattner Authorized Signatory BARBERRY CORP. Name Position ---- -------- Carl C. Icahn Chairman of the Board; President Gail Golden Vice President; Authorized Signatory Jordan Bleznick Vice President/Taxes Vincent J. Intrieri Vice President; Authorized Signatory Irene March Authorized Signatory Edward E. Mattner Authorized Signatory Keith Cozza Secretary; Treasurer