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  **UNITED STATES SECURITIES AND EXCHANGE COMMISSION****Washington, D. C. 20549**** ****FORM 10-K/A****Amendment No. 1**   þ **ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934****For the fiscal year ended December 31, 2010****OR**   o **TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934****Commission File No. 001-34464****RESOLUTE ENERGY CORPORATION**(Exact name of registrant as specified in its charter)   **Delaware** **27-0659371**(State or other jurisdiction of (I.R.S. Employer Identification No.)incorporation or organization)     **1675 Broadway, Suite 1950, Denver, Colorado** **80202**(Address of principal executive offices) (Zip Code)Registrant’s telephone number, including area code: **303-534-4600**Securities registered under Section 12(b) of the Act:   **Title of Each Class** **Name of Exchange on Which Registered**Common Stock, par value $0.0001 per share New York Stock ExchangeWarrants, each exercisable for one share of Common Stock New York Stock ExchangeSecurities registered under to Section 12(g) of the Act: **None**     Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule405 of the Securities Act. Yes o No þ     Indicate by check mark if the registrant is not required to file reports pursuant to Section13 or Section 15(d) of the Act. Yes o No þ     Indicate by check mark whether the registrant (1) has filed all reports required to be filedby Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (orfor such shorter period that the registrant was required to file such reports), and (2) has beensubject to such filing requirements for the past 90 days. Yes þ No o     Indicate by check mark whether the registrant has submitted electronically and posted on itscorporate Website, if any, every Interactive Data File required to be submitted and posted pursuantto Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or forsuch shorter period that the registrant was required to submit and post such files). o Yeso No     Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of RegulationS-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, indefinitive proxy or information statements incorporated by reference in Part III of this Form 10-Kor any amendment to this Form 10-K. þ     Indicate by check mark whether the registrant is a large accelerated filer, an acceleratedfiler, a non-accelerated filer, or smaller reporting company. See definitions of “large acceleratedfiler,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.Large accelerated filer o Accelerated filer þ Non-accelerated filer o Smaller reporting company o    (Do not check if a smaller reporting company)  Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of theAct). Yes o No þ     The aggregate market value of registrant’s common stock held by non-affiliates on June 30,2010, computed by reference to the price at which the common stock was last sold as posted on theNew York Stock Exchange, was $405.2 million.     As of March 10, 2011, 56,345,041 shares of the Registrant’s $0.0001 par value Common Stockwere outstanding.     The following documents are incorporated by reference herein: Portions of the definitive ProxyStatement of Resolute Energy Corporation to be filed pursuant to Regulation 14A of the generalrules and regulations under the Securities Exchange Act of 1934, as amended, for the 2011 annualmeeting of stockholders (“Proxy Statement”) are incorporated by reference into Part III of thisForm 10-K.  
 

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EXPLANATORY NOTESIGNATUREEX-31.1EX-31.2

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**EXPLANATORY NOTE**     The sole purpose of this Form 10-K/A, Amendment No. 1 to Annual Report on Form 10-K for thefiscal year ended December 31, 2010, is to amend and restate the certifications attached asExhibits 31.1 and 31.2 to the registrant’s original Form 10-K. The certifications are being amendedto conform to the language set forth in Regulation S-K, Item 601(b)(31).     The registrant hereby amends and restates section (a)(3) of “Item 15. Exhibits, FinancialStatement Schedules” as follows:     (a)(3) Exhibits   **Exhibit**  **Number** **Description of Exhibits**2.1† Purchase and IPO Reorganization Agreement, dated as of August 2, 2009, among HicksAcquisition Company I, Inc., Resolute Energy Corporation, Resolute Subsidiary Corporation.,Resolute Holdings, LLC, Resolute Holdings Sub, LLC, Resolute Aneth, LLC and HH-HACI, L.P.,(incorporated by reference to *Annex A*to the Registration Statement on Form S-4 filed withthe SEC on August 6, 2009 (File. No 33-161076)(“Initial S-4”).   2.2 Letter Agreement amending Purchase and IPO Reorganization Agreement, dated as of September9, 2009, among Hicks Acquisition Company I, Inc., Resolute Energy Corporation, ResoluteSubsidiary Corporation., Resolute Holdings, LLC, Resolute Holdings Sub, LLC, ResoluteAneth, LLC and HH-HACI, L.P., (incorporated by reference to *Annex A*to the Initial S-4.   2.3† Purchase and Sale Agreement between Exxon Mobil Corporation, ExxonMobil Oil Corporation,Mobil Exploration and Producing North America Inc., Mobil Producing Texas & New Mexico Inc.and Mobil Exploration & Producing U.S. Inc. and Resolute Aneth, LLC — 75% and NavajoNation Oil and Gas Company — 25% dated January 1, 2005 (incorporated by reference toExhibit 2.2 to the Initial S-4).   2.4† Asset Sale Agreement Aneth Unit, Rutherford Unit and McElmo Creek Unit, San Juan County,Utah between Chevron U.S.A. Inc. (as seller) and Resolute Natural Resources Company andNavajo Nation Oil and Gas Company, Inc. (as buyer) dated October 22, 2004 (incorporated byreference to Exhibit 2.3 to the Initial S-4).   2.5† Stock Purchase Agreement dated June 24, 2008, between Primary Natural Resources, Inc. (asseller) and Resolute Acquisition Company, LLC (as buyer) (incorporated by reference toExhibit 2.4 to the Initial S-4).   3.1 Amended and Restated Certificate of Incorporation of Resolute Energy Corporation, filedSeptember 25, 2009 (incorporated by reference to Exhibit 3.1 to the Annual Report on Form10-K of Resolute Energy Corporation filed on March 30, 2010).   3.2 Amended and Restated Bylaws of Resolute Energy Corporation (incorporated by reference toExhibit 3.2 to the Annual Report on Form 10-K of Resolute Energy Corporation filed on March30, 2010).   4.1 Warrant Agreement between Resolute Energy Corporation and Continental Stock Transfer andTrust Company dated September 25, 2009 (incorporated by reference as *Annex D*to the InitialS-4).   4.2 Registration Rights Agreement dated September 25, 2009, among Resolute Energy Corporationand certain holders (incorporated by reference as Exhibit 4.4 to Amendment No. 2 to theInitial S-4 filed on September 8, 2009).
 

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   **Exhibit**  **Number** **Description of Exhibits**10.1 Second Amended and Restated Credit Agreement dated March 30, 2010, between Resolute EnergyCorporation as Borrower and certain of its Subsidiaries as Guarantors, Wells Fargo Bank,National Association, as Administrative Agent, Bank of Montreal as Syndication Agent,Deutsche Bank Securities Inc., UBS Securities LLC and Union Bank, N.A. as Co-DocumentationAgents, and The Lenders Party Hereto, Wells Fargo Securities, LLC and BMO Capital Marketsas Joint Bookrunners and Joint Lead Arrangers (incorporated by reference to Exhibit 10.1 tothe Annual Report on Form 10-K of Resolute Energy Corporation filed on March 30, 2010).   10.2# 2009 Performance Incentive Plan (incorporated by reference as Exhibit 10.7 to AmendmentNo. 1 to the Initial S-4 filed on August 31, 2009).   10.3# Form of Indemnification Agreement between Resolute Energy Corporation and each executiveofficer and independent director of the Company (incorporated by reference as Exhibit 10.8to Amendment No. 1 to the initial S-4 filed on August 31, 2009).   10.4†† Cooperative Agreement between Resolute Natural Resources Company and Navajo Nation Oil andGas Company dated October 22, 2004 (incorporated by reference by Exhibit 10.9 to theInitial S-4).   10.5†† First Amendment of Cooperative Agreement between Resolute Aneth, LLC and Navajo Nation Oiland Gas Company, Inc. dated October 21, 2005 (incorporated by reference as Exhibit 10.10to the Initial S-4).   10.6†† Carbon Dioxide Sale and Purchase Agreement by and between ExxonMobil Gas & Power MarketingCompany (a division of Exxon Mobil Corporation), as agent for Mobil Producing Texas & NewMexico, Inc. (Seller) and Resolute Aneth, LLC (Buyer) dated July 1, 2006, as amended July21, 2006 (incorporated by reference as Exhibit 10.11 to Amendment No. 1 to the Initial S-4filed on August 31, 2009).   10.7†† Product Sale and Purchase Contract by and between Resolute Natural Resources Company(Buyer) and Kinder Morgan CO 2 Company, L.P. (Seller) dated July 1, 2007, asamended October 1, 2007, January 1, 2009 and October 5, 2010 (incorporated by reference asExhibit 10.12 to Amendment No. 1 to the Initial S-4 filed on August 31, 2009 and Exhibit99.1 to the Current Report on Form 8-K filed on October 7, 2010).   10.8 Gas Sales and Purchase Contract — Conventional & Residue Gas dated April 12, 1995, betweenRim Offshore, Inc., as producer, and Western Gas Resources, Inc., as processor (Contract#6690), as amended July 27, 2006 and March 6, 2009 (incorporated by reference as Exhibit10.13 to Amendment No. 1 to the Initial S-4 filed on August 31, 2009).   10.9 Consent Decree, entered into June 2005, relating to alleged violations of the federal CleanAir Act (incorporated by reference as Exhibit 10.16 to the Initial S-4).   10.10 Consent Decree, entered into August 2004, relating to alleged violations of the federalClean Water Act (incorporated by reference as Exhibit 10.17 to the Initial S-4).   10.11 Crude Oil Purchase Agreement dated August 27, 2009 between Western Refining Southwest,Inc., as purchaser, and Resolute Natural Resources Company, as seller (incorporated byreference as Exhibit 10.18 to Amendment No. 1 to the Initial S-4 filed on August 31, 2009).   10.12 Form of Retention Award Agreement between Resolute Energy Corporation and certain awardrecipients (incorporated by reference as Exhibit 10.19 to Amendment No. 2 to the InitialS-4 filed on September 8, 2009).   10.13 Form of Restricted Stock Award Agreement for Non-employee Directors (incorporated byreference to Exhibit 10.13 to the Annual Report on Form 10-K of Resolute Energy Corporationfiled on March 30, 2010).   10.14# Form of Confidentiality and Non Compete Agreement among Resolute Holdings, LLC and certainemployees dated as of January 23, 2004 (incorporated by reference to Exhibit 10.14# to theAnnual Report on Form 10-K of Resolute Energy Corporation filed on March 30, 2010).   10.15# Form of Restricted Stock Agreement for Employees (incorporated by referenced as Exhibit10.1 to the 10-Q filed on May 11, 2010).
 

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   **Exhibit**  **Number** **Description of Exhibits**10.16# Form of Stock Appreciation Right Agreement for Non-employee Directors (incorporated byreference as Exhibit 10.2 to the 10-Q filed on May 11, 2010).   10.17# Letter Agreement between Resolute Energy Corporation and Dale E. Cantwell, effective as ofJune 1, 2010 (incorporated by reference as Exhibit 10.1 to the 10-Q filed on August 12,2010).   10.18# Letter Agreement between Resolute Energy Corporation and Janet W. Pasque, effective as ofJune 1, 2010 (incorporated by reference as Exhibit 10.1 to the 10-Q filed on August 12,2010).   12.1 Statement of Ratio of Earnings to Fixed Charges.   21 List of Subsidiaries of Resolute Energy Corporation.   23.1 Consent of Deloitte & Touche LLP.   23.2 Consent of KPMG LLP.   23.3 Consent of Netherland, Sewell & Associates, Inc.   31.1 Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-OxleyAct of 2002.   31.2 Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes OxleyAct of 2002.   32 Certification of the Chief Executive Officer and Chief Financial Officer pursuant toSection 906 of the Sarbanes-Oxley Act of 2002.   99.1 Report of Netherland, Sewell & Associates, Inc. regarding the registrant’s reserves as ofDecember 31, 2010. † The Purchase and IPO Reorganization Agreement filed as Exhibit 2.1, the Purchase and SaleAgreement filed as Exhibit 2.3, the Asset Sale Agreement filed as Exhibit 2.4, the Purchaseand Sale Agreement filed as Exhibit 2.5 and the Cooperative Agreement file as Exhibit 10.4omit certain of the schedule and exhibits to each of the Purchase and IPO ReorganizationAgreement, Purchase and Sale Agreements, the Asset Sale Agreement and the CooperativeAgreement in accordance with Item 601 (b)(2) of Regulation S-K. A list briefly identifyingthe contents of all omitted schedules and exhibits is included with each of the Purchaseand Sale Agreement, the Asset Sale Agreement and the Cooperative Agreement filed as Exhibit2.1, 2.3, 2.4, 2.5 and 10.4, respectively. Resolute agrees to furnish supplementally a copyof any omitted schedule or exhibit to the Securities and Exchange Commission upon request. †† Portions of this exhibit have been omitted pursuant to a request for confidential treatment. # Management Contract, Compensation Plan or Agreement.
 

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**SIGNATURE**     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has dulycaused this amendment to be signed on its behalf by the undersigned, thereunto duly authorized.Date: August 18, 2011       **RESOLUTE ENERGY CORPORATION**       By: /s/ Nicholas J. Sutton  NicholasJ. Sutton    Chief Executive Officer and Director     Pursuantto the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on thedates indicated.     **Signature** **Title** **Date**/s/ Nicholas J. Sutton Nicholas J. Sutton Chief Executive Officerand Director